Thursday, September 21, 2017

Introverts emerge less as leaders because they engage in higher levels of forecasted negative affect

The failure of introverts to emerge as leaders: The role of forecasted affect. Andrew Spark, Timothy Stansmore, and Peter O'Connor. Personality and Individual Differences, Volume 121, January 15 2018, Pages 84–88.

•    Introverts are less likely to emerge as leaders compared to extraverts.
•    Forecasted affect is proposed to mediate this relationship.
•    Forecasted positive affect has no mediation effect.

    Forecasted negative affect fully mediates the relationship.

Abstract: Introverts are less likely to emerge as leaders than extraverts, however the existing literature provides little explanation as to why. To investigate the potential cause of this trait-based difference in emergent leadership, we measured trait extraversion in a sample of 184 business students and studied their leadership-related behavior in an unstructured group task. We drew from a model of forecasted affect to hypothesize that introverts would be less likely to emerge as leaders based on their belief that engaging in the necessary extraverted behavior would be unpleasant/unenjoyable (i.e. they would forecast higher levels of negative affect compared to extraverts). Consistent with this, we found that introverts were less likely to emerge as leaders, and that forecasted negative affect fully accounted for the relationship between extraversion and peer-rated emergent leadership. We therefore argue that introverts fail to emerge as leaders as often as extraverts because they engage in higher levels of forecasted negative affect and that these forecasts impede their emergent leadership potential.

Keywords: Extraversion; Introversion; Forecasted affect; Emergent leadership

Disgust and Deontology: Trait Sensitivity to Contamination Promotes a Preference for Order, Hierarchy, and Rule-Based Moral Judgment

Disgust and Deontology: Trait Sensitivity to Contamination Promotes a Preference for Order, Hierarchy, and Rule-Based Moral Judgment. Jeffrey S. Robinson, Xiaowen Xu, and Jason E. Plaks. Social Psychological and Personality Science,

Abstract: Models of moral judgment have linked generalized emotionality with deontological moral judgment. The evidence, however, is mixed. Other research has linked the specific emotion of disgust with generalized moral condemnation. Here too, the evidence is mixed. We suggest that a synthesis of these two literatures points to one specific emotion (disgust) that reliably predicts one specific type of moral judgment (deontological). In all three studies, we found that trait disgust sensitivity predicted more extreme deontological judgment. In Study 3, with deontological endorsement and consequentialist endorsement operationalized as independent constructs, we found that disgust was positively associated with deontological endorsement but was unrelated to consequentialist endorsement. Across studies, the disgust–deontology link was mediated by individual difference variables related to preference for order (right-wing authoritarianism and intolerance for ambiguity). These data suggest a more precise model of emotion and moral judgment that identifies specific emotions, specific types of moral judgment, and specific motivational pathways.

A Study of Political Candidacy Among Swedish Adoptees -- Strong transmission in candidacy status between rearing mothers and their daughter

It Runs in the Family: A Study of Political Candidacy Among Swedish Adoptees. Oskarsson, S., Dawes, C.T. & Lindgren, KO. Polit Behav (2017).

Abstract: What motivates citizens to run for office? Recent work has shown that early life parental socialization is strongly associated with a desire to run for office. However, parents not only shape their children’s political environment, they also pass along their genes to those same children. A growing area of research has shown that individual differences in a wide range of political behaviors and attitudes are linked to genetic differences. As a result, genetic factors may confound the observed political similarities among parents and their children. This study analyzes Swedish register data containing information on all nominated and elected candidates in the ten parliamentary, county council, and municipal elections from 1982 to 2014 for a large sample of adoptees and their adoptive and biological parents. By studying the similarity in political ambition within both adoptive and biological families, our research design allows us to disentangle so-called “pre-birth” factors, such as genes and pre-natal environment, and “post-birth” factors like parental socialization. We find that the likelihood of standing as a political candidate is twice as high if one’s parent has been a candidate. We also find that the effects of pre-birth and post-birth factors are approximately equal in size. In addition, we test a number of potential pre- and post-birth transmission mechanisms. First, disconfirming our expectations, the pre-birth effects do not seem to be mediated by cognitive ability or leadership skills. Second, consistent with a role modeling mechanism, we find evidence of a strong transmission in candidacy status between rearing mothers and their daughters.

Immobile Australia: Surnames Show Strong Status Persistence, 1870–2017

Immobile Australia: Surnames Show Strong Status Persistence, 1870–2017. Gregory Clark, Andrew Leigh, and Mike Pottenger. IZA DP No. 11021.

Abstract: The paper estimates long run social mobility in Australia 1870–2017 tracking the status of rare surnames. The status information includes occupations from electoral rolls 1903–1980, and records of degrees awarded by Melbourne and Sydney universities 1852–2017. Status persistence was strong throughout, with an intergenerational correlation of 0.7–0.8, and no change over time. Notwithstanding egalitarian norms, high immigration and a well-targeted social safety net, Australian long-run social mobility rates are low. Despite evidence on conventional measures that Australia has higher rates of social mobility than the UK or USA (Mendolia and Siminski, 2016), status persistence for surnames is as high as that in England or the USA. Mobility rates are also just as low if we look just at mobility within descendants of UK immigrants, so ethnic effects explain none of the immobility.

Women perceive men's limbal rings as a health cue when in mood for casual sex

Put a (limbal) ring on it: Women perceive men's limbal rings as a health cue in short-term mating domains. Mitch Brown and Donald F Sacco. Available from:

Abstract: Limbal rings are dark annuli encircling the iris that fluctuate in visibility based on health and age. Research also indicates their presence augments facial attractiveness. Given individuals’ prioritization of health cues in short-term mates, those with limbal rings may be implicated as ideal short-term mates. Three studies tested whether limbal rings serve as veridical health cues, specifically the extent to which this cue enhances a person’s value as a short-term mating partner. In Study 1, targets with limbal rings were rated as healthier, an effect that was stronger for female participants and male targets. In Study 2, temporally activated short-term mating motives led women to report a heightened preference for targets with limbal rings. In Study 3, women rated targets with limbal rings as more desirable short-term mates. Results provide evidence for limbal rings as veridical cues to health, particularly in relevant mating domains.

Wednesday, September 20, 2017

Accurate Genomic Prediction Of Human Height -- "within a few cm of the prediction"

Accurate Genomic Prediction Of Human Height. Louis Lello, Steven G Avery, Laurent Tellier, Ana Vazquez, Gustavo de los Campos, and Stephen D. H. Hsu. BioRxiv, Sep 19 2017. doi:

Abstract: We construct genomic predictors for heritable and extremely complex human quantitative traits (height, heel bone density, and educational attainment) using modern methods in high dimensional statistics (i.e., machine learning). Replication tests show that these predictors capture, respectively, ~40, 20, and 9 percent of total variance for the three traits. For example, predicted heights correlate ~0.65 with actual height; actual heights of most individuals in validation samples are within a few cm of the prediction. The variance captured for height is comparable to the estimated SNP heritability from GCTA (GREML) analysis, and seems to be close to its asymptotic value (i.e., as sample size goes to infinity), suggesting that we have captured most of the heritability for the SNPs used. Thus, our results resolve the common SNP portion of the "missing heritability" problem - i.e., the gap between prediction R-squared and SNP heritability. The ~20k activated SNPs in our height predictor reveal the genetic architecture of human height, at least for common SNPs. Our primary dataset is the UK Biobank cohort, comprised of almost 500k individual genotypes with multiple phenotypes. We also use other datasets and SNPs found in earlier GWAS for out-of-sample validation of our results.

Psychological roadblocks to the adoption of self-driving vehicles

Psychological roadblocks to the adoption of self-driving vehicles. Azim Shariff, Jean-François Bonnefon & Iyad Rahwan. Nature Human Behaviour (2017), doi:10.1038/s41562-017-0202-6

Summary: Self-driving cars offer a bright future, but only if the public can overcome the psychological challenges that stand in the way of widespread adoption. We discuss three: ethical dilemmas, overreactions to accidents, and the opacity of the cars’ decision-making algorithms — and propose steps towards addressing them.

Prolonged transport and cannibalism of mummified infant remains by a Tonkean macaque mother

Prolonged transport and cannibalism of mummified infant remains by a Tonkean macaque mother. Arianna De Marco, Roberto Cozzolino, and Bernard Thierry. Primates.

Abstract: Observations of animals’ responses to dying or dead companions raise questions about their awareness of states of helplessness or death of other individuals. In this context, we report the case of a female Tonkean macaque (Macaca tonkeana) that transported the body of her dead infant for 25 days and cannibalized its mummified parts. The mother appeared agitated in the first 2 days after the birth. She then took care of her infant’s corpse, which progressively dried and became mummified. In a third stage, the mother continued to transport the corpse as it started disintegrating, and she gnawed and consumed some parts of the remains. Our observations suggest that mummification of the body favored persistence of maternal behaviors by preserving the body’s shape. The female gradually proceeded from strong attachment to the infant’s body to decreased attachment, then finally full abandonment of the remains.

Anticipated regret from erring after following advice is greater than anticipated regret from erring after ignoring advice

Tzini, K., and Jain, K. (2017) The Role of Anticipated Regret in Advice Taking. J. Behav. Decision Making, doi: 10.1002/bdm.2048.

Abstract: Across five studies, we demonstrate that anticipated future regret influences receptiveness to advice. While making a revision to one's own judgment based on advice, people can anticipate two kinds of future regret: (a) the regret of following non-beneficial advice and (b) the regret of ignoring beneficial advice. In studies 1a (scenario task) and 1b (judgment task), we find that anticipated regret from erring after following advice is greater than anticipated regret from erring after ignoring advice. Furthermore, receptiveness decreases as the difference between anticipated regret from following and from ignoring advice increases. In study 2, we demonstrate that perceived justifiability of one's own initial decision is greater than that of advice. This difference in perceived justifiability influences anticipated regret and that, in turn, influences receptiveness. In study 3, we investigate the effect of advisor's expertise on perceived justifiability, anticipated regret, and receptiveness. In study 4, we propose and test an intervention to improve receptiveness based on self-generation of advice justifications. Participants who were asked to self-generate justifications for the advice were more receptive to it. This effect was mediated by perceived justifiability and anticipated regret. These findings shed further light on what prevents people from being receptive to advice and how this can be improved.

Resource Allocation Decisions: When Do We Sacrifice Efficiency in the Name of Equity?

Resource Allocation Decisions: When Do We Sacrifice Efficiency in the Name of Equity? Tom Gordon-Hecke et al. Interdisciplinary Perspectives on Fairness, Equity, and Justice, pp 93-105.

Abstract: Equity, or the idea that one should be compensated according to one’s respective contribution, is a fundamental principle for resource allocation. People tend to endorse equity in a wide range of contexts, from interpersonal relationships to public policy. However, at times, equity might come at the expense of efficiency. What do people do when they must waste resources to maintain equity? In this chapter, we adopt a behavioral perspective on such equity–efficiency trade-offs, reviewing the relevant findings from the social psychology, judgment and decision-making and behavioral economics literature. We show that whereas allocators will often choose to waste in the name of equity, this is not necessarily the case. We review various psychological aspects that affect the allocators’ decision.

The Facial Width-to-Height Ratio Predicts Sex Drive, Sociosexuality, and Intended Infidelity

The Facial Width-to-Height Ratio Predicts Sex Drive, Sociosexuality, and Intended Infidelity. Steven Arnocky et al. Archives of Sexual Behavior,

Abstract: Previous research has linked the facial width-to-height ratio (FWHR) to a host of psychological and behavioral characteristics, primarily in men. In two studies, we examined novel links between FWHR and sex drive. In Study 1, a sample of 145 undergraduate students revealed that FWHR positively predicted sex drive. There were no significant FWHR × sex interactions, suggesting that FWHR is linked to sexuality among both men and women. Study 2 replicated and extended these findings in a sample of 314 students collected from a different Canadian city, which again demonstrated links between the FWHR and sex drive (also in both men and women), as well as sociosexuality and intended infidelity (men only). Internal meta-analytic results confirm the link between FWHR and sex drive among both men and women. These results suggest that FWHR may be an important morphological index of human sexuality.

Contrary to prediction, kids these days are better able to delay gratification than they were in the past

Kids These Days: 50 years of the Marshmallow task. Protzko.

Abstract: Have children gotten worse at their ability to delay gratification? We analyze the past 50 years of data on the Marshmallow test of delay of gratification. Children must wait to get two preferred treats; if they cannot wait, they only get one. Duration for how long children can delay has been associated with a host of positive life outcomes. Here we provide the first evidence on whether children’s ability to delay gratification has truly been decreasing, as theories of technology or a culture of instant gratification have predicted. Before analyzing the data, we polled 260 experts in cognitive development, 84% of who believed kids these days are getting worse or are no different. Contrary to this prediction, kids these days are better able to delay gratification than they were in the past, corresponding to a fifth of a standard deviation increase in ability per decade.

Belief in free will affects causal attributions when judging others’ behavior

Belief in free will affects causal attributions when judging others’ behavior. Oliver Genschow, Davide Rigoni, and Marcel Brass. Proceedings of the National Academy of Sciences, vol. 114 no. 38, 10071–10076, doi: 10.1073/pnas.1701916114

Significance: The question whether free will exists or not has been a matter of debate in philosophy for centuries. Recently, researchers claimed that free will is nothing more than a myth. Although the validity of this claim is debatable, it attracted much attention in the general public. This raises the crucial question whether it matters if people believe in free will or not. In six studies, we tested whether believing in free will is related to the correspondence bias—that is, people’s automatic tendency to overestimate the influence of internal as compared to external factors when interpreting others’ behavior. Overall, we demonstrate that believing in free will increases the correspondence bias and predicts prescribed punishment and reward behavior.

Abstract: Free will is a cornerstone of our society, and psychological research demonstrates that questioning its existence impacts social behavior. In six studies, we tested whether believing in free will is related to the correspondence bias, which reflects people’s automatic tendency to overestimate the influence of internal as compared to external factors when interpreting others’ behavior. All studies demonstrate a positive relationship between the strength of the belief in free will and the correspondence bias. Moreover, in two experimental studies, we showed that weakening participants’ belief in free will leads to a reduction of the correspondence bias. Finally, the last study demonstrates that believing in free will predicts prescribed punishment and reward behavior, and that this relation is mediated by the correspondence bias. Overall, these studies show that believing in free will impacts fundamental social-cognitive processes that are involved in the understanding of others’ behavior.

Maximizers maximize for both themselves and others, whereas satisficers satisfice for themselves but maximize for others

Do maximizers maximize for others? Self-other decision-making differences in maximizing and satisficing. Mo Luan , Lisha Fu , and Hong Li. Personality and Individual Differences, Volume 121, 15 January 2018, Pages 52–56,

•    Self-other decision-making differences between maximizers and satisficers exist.
•    Maximizers maximize for both themselves and others.
•    Satisficers satisfice for themselves but maximize for others.

Abstract: The current research provides initial evidence of self-other decision-making differences between maximizers and satisficers by focusing on how they make the tradeoff between the value and the effort an option requires when deciding for themselves and for others. Study 1 demonstrates that maximizers prefer a high-value but effort-consuming option both for themselves and for others, whereas satisficers prefer that option for others but not for themselves. Study 2 further shows that to attain high value with a choice, maximizers not only are willing to expend more effort themselves but also advise others to expend more effort; however, satisficers choose to expend less effort themselves but do not advise others to do so. In conclusion, the current research contributes to the relevant literature by demonstrating that maximizers maximize for both themselves and others, whereas satisficers satisfice for themselves but maximize for others.

Keywords: Self-other decision-making; Maximizing; Satisficing; Value; Effort

Consumers in durable goods markets are rational and forward looking

Are consumers forward looking? Evidence from used iPhones. Kanis Saengchote & Voraprapa Nakavachara. Applied Economics Letters, Pages 1-5.

ABSTRACT: This study examines the impact of planned obsolescence – the introduction of new models to make existing models obsolete – on secondary markets for mobile phones. Using data of over 320,000 used iPhones listings on Thailand’s largest online marketplace, we document that iPhone prices decrease with age, around 2.8–3.2% for each passing month. We find no evidence that the price decline accelerates after launches of new models (i.e. obsolescence), lending support to the view that consumer in durable goods markets are rational and forward looking.

KEYWORDS: Durable goods, mobile phones, product obsolescence, forward-looking consumer

Tuesday, September 19, 2017

Reasons Probably Won’t Change Your Mind: The Role of Reasons in Revising Moral Decisions

Stanley, M. L., Dougherty, A. M., Yang, B. W., Henne, P., & De Brigard, F. (2017). Reasons Probably Won’t Change Your Mind: The Role of Reasons in Revising Moral Decisions. Journal of Experimental Psychology: General.

Abstract: Although many philosophers argue that making and revising moral decisions ought to be a matter of deliberating over reasons, the extent to which the consideration of reasons informs people’s moral decisions and prompts them to change their decisions remains unclear. Here, after making an initial decision in 2-option moral dilemmas, participants examined reasons for only the option initially chosen (affirming reasons), reasons for only the option not initially chosen (opposing reasons), or reasons for both options. Although participants were more likely to change their initial decisions when presented with only opposing reasons compared with only affirming reasons, these effect sizes were consistently small. After evaluating reasons, participants were significantly more likely not to change their initial decisions than to change them, regardless of the set of reasons they considered. The initial decision accounted for most of the variance in predicting the final decision, whereas the reasons evaluated accounted for a relatively small proportion of the variance in predicting the final decision. This resistance to changing moral decisions is at least partly attributable to a biased, motivated evaluation of the available reasons: participants rated the reasons supporting their initial decisions more favorably than the reasons opposing their initial decisions, regardless of the reported strategy used to make the initial decision. Overall, our results suggest that the consideration of reasons rarely induces people to change their initial decisions in moral dilemmas.

Check also: Deliberation increases the wisdom of crowds. Joaquin Navajas, Tamara Niella, Gerry Garbulsky, Bahador Bahrami, Mariano Sigman. ArXiv Mar 2017,

Mothers want extraversion over conscientiousness or intelligence for their children

Mothers want extraversion over conscientiousness or intelligence for their children. Rachel Latham & Sophie von Stumm. Personality and Individual Differences, Volume 119, Dec 01 2017, Pages 262-265,

•    We examined what traits mothers value as most important for their child to have.
•    Mothers valued extraversion as most important for their child.
•    Extraversion was preferred over intelligence and conscientiousness.

Abstract: Intelligence and conscientiousness are key predictors of all important life outcomes, such as socioeconomic success, marital status, health and longevity. It is unclear, however, if and to what extent lay people appreciate these dimensions of individual differences. Here, 142 mothers of 0–12 month old infants were asked to select from each of the Big Five personality traits the facets that they most liked their child to have. Afterwards, mothers rank-ordered the facets they had selected and ‘intelligence’ from most to least important for their child to have. Less than 10% of mothers rated intelligence and the conscientiousness facet as most important. By contrast, 51% rated the extraversion facet as most important, followed by 20% of mothers who favoured the agreeableness facet. Our results suggest that mothers preferred extraversion over intelligence and conscientiousness, despite their strong, empirically demonstrated predictive validity for important life outcomes.

Emission budgets and pathways consistent with limiting warming to 1.5 °C

Emission budgets and pathways consistent with limiting warming to 1.5 °C. Richard J. Millar et al. Nature Geoscience (2017), doi:10.1038/ngeo3031

Abstract: The Paris Agreement has opened debate on whether limiting warming to 1.5 °C is compatible with current emission pledges and warming of about 0.9 °C from the mid-nineteenth century to the present decade. We show that limiting cumulative post-2015 CO2 emissions to about 200 GtC would limit post-2015 warming to less than 0.6 °C in 66% of Earth system model members of the CMIP5 ensemble with no mitigation of other climate drivers, increasing to 240 GtC with ambitious non-CO2 mitigation. We combine a simple climate–carbon-cycle model with estimated ranges for key climate system properties from the IPCC Fifth Assessment Report. Assuming emissions peak and decline to below current levels by 2030, and continue thereafter on a much steeper decline, which would be historically unprecedented but consistent with a standard ambitious mitigation scenario (RCP2.6), results in a likely range of peak warming of 1.2–2.0 °C above the mid-nineteenth century. If CO2 emissions are continuously adjusted over time to limit 2100 warming to 1.5 °C, with ambitious non-CO2 mitigation, net future cumulative CO2 emissions are unlikely to prove less than 250 GtC and unlikely greater than 540 GtC. Hence, limiting warming to 1.5 °C is not yet a geophysical impossibility, but is likely to require delivery on strengthened pledges for 2030 followed by challengingly deep and rapid mitigation. Strengthening near-term emissions reductions would hedge against a high climate response or subsequent reduction rates proving economically, technically or politically unfeasible.

“No one wants to be seen as someone who can’t afford to get online.”

Facebook Faces a New World as Officials Rein In a Wild Web. By PAUL MOZUR, MARK SCOTT and MIKE ISAAC. TNYT, Sept 17, 2017.

Facebook expanded its efforts in [Kenya,] country of 48 million in 2014. It teamed up with Airtel Africa, a mobile operator, to roll out Facebook’s Free Basics — a no-fee version of the social network, with access to certain news, health, job and other services there and in more than 20 other countries worldwide. In Kenya, the average person has a budget of just 30 cents a day to spend on internet access.

Free Basics now lets Kenyans use Facebook and its Messenger service at no cost, as well as read news from a Kenyan newspaper and view information about public health programs. Joe Mucheru, Kenya’s tech minister, said it at least gives his countrymen a degree of internet access.

Still, Facebook’s plans have not always worked out. Many Kenyans with access to Free Basics rely on it only as a backup when their existing smartphone credit runs out.

“Free Basics? I don’t really use it that often,” said Victor Odinga, 27, an accountant in downtown Nairobi. “No one wants to be seen as someone who can’t afford to get online.”

Encouraging consumers to take photos of sentimental possessions before donating them increases donations

Karen Page Winterich, Rebecca Walker Reczek, and Julie R. Irwin (2017) Keeping the Memory but Not the Possession: Memory Preservation Mitigates Identity Loss from Product Disposition. Journal of Marketing: September 2017, Vol. 81, No. 5, pp. 104-120.

Abstract: Nonprofit firms' reliance on donations to build inventory distinguishes them from traditional retailers. This reliance on consumer donations means that these organizations face an inherently more volatile supply chain than retailers that source inventory from manufacturers. The authors propose that consumer reluctance to part with possessions with sentimental value causes a bottleneck in the donation process. The goal of this research is therefore to provide nonprofits with tools to increase donations of used goods and provide a theoretical link between the literature streams on prosocial behavior, disposition, memory, and identity. As such, the authors explore the effectiveness of memory preservation strategies (e.g., taking a photo of a good before donating it) in increasing donations to nonprofits. A field study using a donation drive demonstrates that encouraging consumers to take photos of sentimental possessions before donating them increases donations, and five laboratory experiments explicate this result by mapping the proposed psychological process behind the success of memory preservation techniques. Specifically, these techniques operate by ameliorating consumers' perceived identity loss when considering donation of sentimental goods.

Keywords: nonprofit marketing, donation, memory, identity, product disposition

Propensity for self-employment and success increase with ability balance

All About Balance? A Test of the Jack-of-all-Trades Theory Using Military Enlistment Data. Lina Aldén, Mats Hammarstedt, and Emma Neuman. Labour Economics.

•    We test the Jack-of-all-trades theory using Swedish military enlistment data
•    Ability balance is measured based on tests of cognitive and non-cognitive ability
•    The unique data addresses the issue of endogeneity in skill balance
•    We find that both propensity for self-employment and success increase with ability balance
•    Policies for skill-building in many areas should encourage self-employment

Abstract: According to the Jack-of-all-trades theory, people with a balanced set of skills are more suitable for self-employment than are those without. In this paper we test this theory using Swedish Military Enlistment data. This data enables us to construct a measure of balance in abilities that, in comparison to measures used in previous research, is less contaminated by endogeneity problems. We find clear support for the Jack-of-all-trades theory, in the sense that the likelihood of being self-employed is higher for individuals whose skills are balanced. In addition, their earnings from self-employment tend to be higher.

Keywords: Ability balance; Cognitive and non-cognitive ability; Earnings; Jack-of-all-trades theory; Occupational choice; Self-employment

JEL-classification: J24; J31; L26

Monday, September 18, 2017

The Evolutionary Psychology of Envy and Jealousy

The Evolutionary Psychology of Envy and Jealousy. Vilayanur S. Ramachandran and Baland Jalal. Front. Psychol., 19 September 2017 |

Abstract: The old dogma has always been that the most complex aspects of human emotions are driven by culture; Germans and English are thought to be straight-laced whereas Italians and Indians are effusive. Yet in the last two decades there has been a growing realization that even though culture plays a major role in the final expression of human nature, there must be a basic scaffolding specified by genes. While this is recognized to be true for simple emotions like anger, fear, and joy, the relevance of evolutionary arguments for more complex nuances of emotion have been inadequately explored. In this paper, we consider envy or jealousy as an example; the feeling evoked when someone is better off than you. Our approach is broadly consistent with traditional evolutionary psychology (EP) approaches, but takes it further by exploring the complexity and functional logic of the emotion – and the precise social triggers that elicit them – by using deliberately farfetched, and contrived “thought experiments” that the subject is asked to participate in. When common sense (e.g., we should be jealous of Bill Gates – not of our slightly richer neighbor) appears to contradict observed behavior (i.e., we are more envious of our neighbor) the paradox can often be resolved by evolutionary considerations which predict the latter. Many – but not all – EP approaches fail because evolution and common sense do not make contradictory predictions. Finally, we briefly raise the possibility that gaining deeper insight into the evolutionary origins of certain undesirable emotions or behaviors can help shake them off, and may therefore have therapeutic utility. Such an approach would complement current therapies (such as cognitive behavior therapies, psychoanalysis, psychopharmacologies, and hypnotherapy), rather than negate them.

(3) Let us say I were to prove by brain scans or some other reliable measure (e.g., mood/affect inventory) that (A) the Dalai Lama was vastly happier on some abstract, but very real, scale than (B) someone (say Hugh Heffner) who has limitless access to attractive women. Who are you more envious of?

Most men are more envious of the latter (9 out of 9 males we surveyed chose B). In other words, you are more jealous of what the other person has access to (in relation to what you desire), than of the final overall state of joy and happiness. This is true even though common sense might dictate the opposite. Put differently, evolution has programmed into you an emotion (jealousy) that is triggered by certain very specific “releasers” or social cues; it is largely insensitive to what the other person’s final state of happiness is. The final state of happiness is too abstract to have evolved as a trigger of envy or jealousy.

For similar reasons, if you are starving it makes more sense that you would be more jealous (at least temporarily) of someone enjoying a fine meal than someone having sex with a beautiful woman or man. If you are only slightly hungry, however, you might pick sex. This is because there is an unconscious metric in your brain that computes the probability of finding food in the near future vs. finding a nubile, available mate; and of the urgency of your need for food over the urgency of mating. If you are starving to death and have one last fling, you have only that single mating opportunity whereas if you eat and live you will have plenty of mating opportunities in the future.

Higher USA State Resident Neuroticism Is Associated With Lower State Volunteering Rates

Higher USA State Resident Neuroticism Is Associated With Lower State Volunteering Rates. Stewart McCann. Personality and Social Psychology Bulletin,

Abstract: Highly neurotic persons have dispositional characteristics that tend to precipitate social anxiety that discourages formal volunteering. With the 50 American states as analytical units, Study 1 found that state resident neuroticism correlated highly (r = -.55) with state volunteering rates and accounted for another 26.8% of the volunteering rate variance with selected state demographics controlled. Study 2 replicated Study 1 during another period and extended the association to college student, senior, secular, and religious volunteering rates. Study 3 showed state resident percentages engaged in other social behaviors involving more familiarity and fewer demands than formal volunteering related to state volunteering rates but not to neuroticism. In Study 4, state resident neuroticism largely accounted statistically for relations between state volunteering rates and state population density, collectivism, social capital, Republican preference, and well-being. This research is the first to show that state resident neuroticism is a potent predictor of state volunteering rates.

Outrage-inducing content appears to be more prevalent and potent online than offline

Moral outrage in the digital age. M. J. Crockett. Nature Human Behaviour (2017). doi:10.1038/s41562-017-0213-3

Moral outrage is a powerful  emotion that motivates people to shame and punish wrongdoers. Moralistic punishment can be a force for good, increasing cooperation by holding bad actors accountable. But punishment also has a dark side — it can exacerbate social conflict by dehumanizing others  and escalating into destructive feuds.

Moral outrage is at least as old as civilization itself, but civilization is rapidly changing in the face of new technologies. Worldwide, more than a billion people now spend at least an hour a day on social media, and moral outrage is all the rage online. In recent years, viral online shaming has cost
companies millions, candidates elections, and individuals their careers overnight.

As digital media infiltrates our social lives, it is crucial that we understand how this technology might transform the expression of moral outrage and its social consequences. Here, I describe a simple psychological framework for tackling this question (Fig. 1). Moral outrage is triggered by stimuli that call attention to moral norm violations. These stimuli evoke a range of emotional and behavioural responses that vary in their costs and constraints. Finally, expressing outrage leads to a variety of personal and social outcomes. This framework reveals that digital media may exacerbate the expression of moral outrage by inflating its triggering stimuli, reducing some of its costs and amplifying many of its personal benefits.

If moral outrage is a fire, is the internet like gasoline? Technology companies have argued that their products provide neutral platforms for social behaviours but do not change those behaviours. This is an empirical question that behavioural scientists should address, because its answer has ethical and regulatory implications.

The framework proposed here offers a set of testable hypotheses about the impact of digital media on the expression of moral outrage and its social consequences. Digital media may promote the expression of moral outrage by magnifying its triggers, reducing its personal costs and amplifying its personal benefits. At the same time, online social networks may diminish the social benefits of outrage by reducing the likelihood that norm-enforcing messages reach their targets, and could even impose new social costs by increasing polarization.

Preliminary data support the framework’s predictions, showing that outrage-inducing content appears to be more prevalent and potent online than offline. Future studies should investigate the extent to which digital media platforms intensify moral emotions, promote habit formation, suppress productive social discourse, and change the nature of moral outrage itself. There are vast troves of data that are directly pertinent to these questions, but not all of it is publicly available. These data can and should be used to understand how new technologies might transform ancient social emotions from a force for collective good into a tool for collective self-destruction.

Cognitive Resources in the Service of Identity Expression

An Expressive Utility Account of Partisan Cue Receptivity: Cognitive Resources in the Service of Identity Expression. Yphtach Lelkes, Ariel Malka, and Bert N. Bakker.

Abstract: What motivates citizens to rely on partisan cues when forming political judgments? Extant literature offers two perspectives on this matter: an optimistic view that reliance on cues serves to enable adequate decision making when cognitive resources are low, and a pessimistic view that reliance on cues serves to channel cognitive resources to the goal of expressing valued political identities. In the present research we seek to further understanding of the relative importance of these two motives. We find that individuals low in cognitive resources are not more likely to follow partisan cues than are individuals high in cognitive resources. Furthermore, we find the highest level of cue receptivity is observed for those individuals who have both a strong social identification with their party and high cognitive resources. This suggests that partisan cue receptivity more often involves a harnessing of cognitive resources for the goal of identity expression.

Keywords: Partisan Cues, Social Identity, Cognitive Reflection, Motivated Reasoning

This work complements and extends two recent projects on the role of reflection on political reasoning. First, Arceneaux and Vander Wielen (2017) argue that those who are the least likely to be affectively attached to issues or parties and the most likely to be reflective exhibit behavior most akin to democratic ideals. In particular, these low affect/high reflection citizens are less likely to conform to elite cues than those who are high in affect and low in reflection. This is because these citizens combine relative weak emotional attachments to party-consistent issue positions with a relatively strong tendency to engage in effortful reasoning that could override emotional intuitions. As our strength of party identity measures affective attachment to a party (Huddy et al., 2015), the present work investigates the effect of high affect/high reflection on political reasoning, and our results are in line with Arceneaux and Vander Wielen (2017) untested predictions which they suggest for future research. Specifically, strong cognitive resources combined with an emotional attachment to partisanship seems to lead to toeing the party line. Second, Groenendyk (2013) argues that cognitive resources are required to defend one’s partisan identity–one reason partisan identities may remain stable among those high in cognitive resources is because they are able to rationalize changing attitude structures. The present findings reinforce that perspective as well.

Sunday, September 17, 2017

How the Presence of Others Affects Desirability Judgments in Heterosexual and Homosexual Participants

Scofield, John E, Bogdan Kostic, and Erin M Buchanan. 2017. “How the Presence of Others Affects Desirability Judgments in Heterosexual and Homosexual Participants”. Open Science Framework. September 17.

Abstract: Mate-choice copying is a mating strategy wherein females rely on contextual information to assist in securing accurate assessments of potential mates. Mate-choice copying has been extensively studied in non-human species and has begun to be examined in humans as well. Hill and Buss (2008) found evidence of opposing effects for men and women in desirability judgments based on the presence of other opposite-sex people. The current project successfully replicated Hill and Buss (2008), Experiment 1, finding support for the desirability enhancement effect and the desirability diminution effect. The current project also extended Hill and Buss, Experiment 1, to include homosexual participants. Homosexual men showed similar patterns as heterosexual women, and homosexual women showed similar patterns as heterosexual men, revealing differences across sexual orientation in human mate-choice copying.

The purpose of the current project was to replicate Hill and Buss (2008), Experiment 1 and to extend their findings to include homosexual populations. Hill and Buss found opposing sex differences while investigating the presence of others on judgments of desirability. Hill and Buss found evidence for the desirability enhancement effect, in which females rated male targets surrounded by females as more desirable compared to those same males surrounded by other males. Desirability judgments had the opposite effect on male participants, known as the desirability diminution effect. Male participants rated target females as less desirable when surrounded by males, compared to when those same females were surrounded by other females.

Females were suggested to employ mate-choice copying mating tactics, such as social information provided in stimulus photographs when making mate assessments. In evolutionary theory, females may take into consideration the presence of other females, providing cues to the mate quality of males. Specifically, with females surrounding males, the mate quality of the male is assumed to be higher. Men were shown not to use typical mate-choice copying mating tactics. Males rated female targets surrounded by males as less desirable than when surrounded by other females or when alone. Males were suggested to assess potential mates with a probabilistic orientation, suggesting that the presence of other males in the scene hint at a decreased probability of gaining access to that mate, negatively influencing desirability judgments of that target female.


Results showed that homosexual male participants rated target males surrounded by females as more desirable compared to male targets surrounded by other males. Homosexual female participants, however, showed the opposite effect in that they rated target females less desirable when surrounded by males compared to when surrounded by females. This result is contrary to our predictions that heterosexual and homosexual judgments would both follow similar patterns, dictated per biological sex (regardless of sexual orientation). That is, homosexual and heterosexual men would both exhibit the desirability diminution effect, and both homosexual and heterosexual women would exhibit the desirability enhancement effect.

Liberals and Conservatives Are Similarly Motivated to Deny Attitude-Inconsistent Science

Science Denial Across the Political Divide -- Liberals and Conservatives Are Similarly Motivated to Deny Attitude-Inconsistent Science. Anthony N. Washburn, Linda J. Skitka. Social Psychological and Personality Science, 10.1177/1948550617731500

Abstract: We tested whether conservatives and liberals are similarly or differentially likely to deny scientific claims that conflict with their preferred conclusions. Participants were randomly assigned to read about a study with correct results that were either consistent or inconsistent with their attitude about one of several issues (e.g., carbon emissions). Participants were asked to interpret numerical results and decide what the study concluded. After being informed of the correct interpretation, participants rated how much they agreed with, found knowledgeable, and trusted the researchers’ correct interpretation. Both liberals and conservatives engaged in motivated interpretation of study results and denied the correct interpretation of those results when that interpretation conflicted with their attitudes. Our study suggests that the same motivational processes underlie differences in the political priorities of those on the left and the right.

Check also: Kahan, Dan M. and Peters, Ellen, Rumors of the 'Nonreplication' of the 'Motivated Numeracy Effect' are Greatly Exaggerated (August 26, 2017). Available at SSRN:

And: Biased Policy Professionals. Sheheryar Banuri, Stefan Dercon, and Varun Gauri. World Bank Policy Research Working Paper 8113.

And: Dispelling the Myth: Training in Education or Neuroscience Decreases but Does Not Eliminate Beliefs in Neuromyths. Kelly Macdonald et al. Frontiers in Psychology, Aug 10 2017.

And: Wisdom and how to cultivate it: Review of emerging evidence for a constructivist model of wise thinking. Igor Grossmann. European Psychologist, in press. Pre-print:

Liberals Possess More National Consensus on Political Attitudes in the US

Liberals Possess More National Consensus on Political Attitudes in the United States -- An Examination Across 40 Years. Peter Ondish, Chadly Stern. Social Psychological and Personality Science,

Abstract: Do liberals or conservatives have more agreement in their political attitudes? Recent research indicates that conservatives may have more like-minded social groups than do liberals, but whether conservatives have more consensus on a broad, national level remains an open question. Using two nationally representative data sets (the General Social Survey and the American National Election Studies), we examined the attitudes of over 80,000 people on more than 400 political issues (e.g., attitudes toward welfare, gun control, same-sex marriage) across approximately 40 years. In both data sets, we found that liberals possessed a larger degree of agreement in their political attitudes than did conservatives. Additionally, both liberals and conservatives possessed more consensus than did political moderates. These results indicate that social–cognitive motivations for building similarity and consensus within one’s self-created social groups may also yield less consensus on a broad, national level. We discuss implications for effective political mobilization and social change.

“All my life I have been told that capitalism, particularly the American type, was bad,” Mr. Gujanicic, 63, said

As China Moves In, Serbia Reaps Benefits, With Strings Attached. By BARBARA SURK. The New York Times, Sep 09, 2017,

Mileta Gujanicic, a steelworker and union leader, is one of those who hope China fulfills its vision for the Smederevo mill: He has worked there for 40 years and says he got used to the ways of the Americans, whom he called “the aristocracy of the industrial world.”

“All my life I have been told that capitalism, particularly the American type, was bad,” Mr. Gujanicic, 63, said. “But we workers have been valued, well paid and respected when the Americans ran this place.”

The Chinese approach to running the mill, he said, is sharply different. So far, the new owners have maintained their pledge to retain jobs. But none of the promises Mr. Xi made during his visit have been kept.

Workers’ contracts are veiled in secrecy, safety standards have fallen, maintenance is at the bare minimum, and contact between the owners and the employees does not exist, he said. The erosion of workers’ rights and the employers’ disregard of labor laws are troubling, he said.

My comment: Mr Gujanicic, 63, was a Communist some time, but changed his opinion. What do you think, that he is being (more or less) objective, or that he has idealized his American bosses?

Research: The readability of scientific texts is decreasing over time

Research: The readability of scientific texts is decreasing over time. Pontus Plavén-Sigray et al. eLife 2017;6:e27725.

Abstract: Clarity and accuracy of reporting are fundamental to the scientific process. Readability formulas can estimate how difficult a text is to read. Here, in a corpus consisting of 709,577 abstracts published between 1881 and 2015 from 123 scientific journals, we show that the readability of science is steadily decreasing. Our analyses show that this trend is indicative of a growing use of general scientific jargon. These results are concerning for scientists and for the wider public, as they impact both the reproducibility and accessibility of research findings.

My comment: Why is this so? Is there a part of snob behavior? A way to separate oneself from the great unwashed?

Saturday, September 16, 2017

Local mating markets in humans and non-human animals

Local mating markets in humans and non-human animals. Ronald Noë. Behavioral Ecology and Sociobiology, October 2017, 71:148.

Abstract: In biology, the term ‘mating market’ has been fashionable for a few decades only, but sexual selection theory was implicitly based on economic principles from the start. I regard mating individuals explicitly as traders on markets and distinguish ‘global mating markets’, consisting of all reproducing members of a population, from ‘local mating markets’ (LMMs) that are disconnected in space and/or time. I focus on ways in which individuals make the best of variation among LMMs by adapting their mating strategy to each local market they enter. The ‘operational sex ratio’ (OSR; Emlen ST, Oring LW (1977) Science 197:215–223) gives a first approximation of the balance of power between the two trader classes: males and females ready to reproduce. The parameter I use is the local OSR (LOSR), the OSR of a single LMM. The balance of power is dependent not only on the LOSR, however, but also on the production costs and exchange values of ‘crucial commodities’, which often vary locally and over time. Distinguishing LMMs is most useful for species with strong variation in the LOSR. Human mating markets distorted by war, selective abortion and sex-biased migration are among the best-documented local markets with aberrant OSRs. Traders on LMMs may strategically adjust to supply and demand ratios and changes in their own market value but also attempt to change local market conditions or transfer to another local market with better conditions. Fine-tuning can result not only from conditional strategies, evolved under natural and sexual selection, but also from learning processes as far as species-specific cognitive constraints allow.

Significance statement: Biological market theory (BMT), which deals with cooperation among unrelated agents in general, is combined with sexual selection theory (SST), which deals with reproductive cooperation, to focus on an aspect that received little attention in the vast SST literature: adaptations that improve mating success when the market value of an individual varies considerably from one local mating market (LMM) to the next. An individual’s market value on an LMM is determined not only by the local operational sex ratio (LOSR) but also by the value of the goods and services that both sexes invest in their mates and/or the communal offspring. Case studies of both humans and non-human animals are used to illustrate the difference between global and local markets and to evaluate predictions based on the LMM-hypothesis.

Prediction 2: sensitivity to one’s own market value and adjustment to changes in market value of self and others

...Broadly speaking, individual changes inmarket value can be due to changes relative to local competitors, changes in the LOSR, or changes in the production costs of commodities. As the consequences of the latter are hard to predict, I will concentrate on the other two factors, the first of which is notably well documented in humans. ***A universal, frequently reported human pattern is that men are attracted by youth in women and women are attracted by men that can offer resources***... During their exceptionally long mating career, men can gradually gain in value with age by slowly accumulating wealth or a steady rise in salary. Their market value can also increase abruptly, for example by high gains in the lottery, or a sudden ascent to a powerful position. ***After reaching maximal fertility in their early twenties (Hawkes and Smith 2010), women tend to gradually lose market value, as far as this is contingent on their age. Men are sensitive to cues informing about age, which is ultimately linked to reproductive potential***. Humans of either sex tend to adjust their demands and expectations to changes in their market value. For example, following earlier papers... in both methods and ideas, Pawłowski and Dunbar... showed that ***with increasing age, women become less demanding, quantified as the number of preferred characteristics listed in ‘Lonely Hearts’ advertisements. This sensitivity to market value of self in humans has since been confirmed in numerous other studies...  Climbing down a peg when one is not doing very well on the mating market, often is a ‘best-of-a-bad-job’ strategy***... Inferior competitors in several species use strategies radically different from those of their high-quality rivals. ***For example, big bullfrogs croak loudly in order to attract females, but small males of the same species remain silent and ambush the females that are on their way to the big bullies, a strategy known as ‘sneaking’...  Strategies that differ radically from the main stream exist among humanmales too, of course, e.g. rape and brothel visits.***

Members of several other species are also able to calibrate their mate preferences according to their own market value.  Spotted bowerbird males decorate their bowers with Solanum berries, the number of which shows considerable variation among males with higher numbers correlating with higher mating success. After experimental changes of the number of berries that decorated their bower, males added or removed berries to such an extent that the natural number was more or less restored. Males with berry-numbers considerably larger than what they had contributed themselves, suffered an increased risk of having their bowers disrupted by neighbouring males. - (Griggio and Hoi 2010). The latter authors also found indications of sensitivity to the own attractivity in bearded reedlings... Another house sparrow study (Schwagmeyer 2014) showed similar market effects, not only during pair formation at the start of the reproductive season but also in the form of partner switches during the season. ***The latter reminds of humans again: people report more satisfaction with their present partner when their prospects of switching to a higher quality mate are dim...***

Check also: Behavioral display of lumbar curvature in response to the opposite sex. Zeynep Şenveli Bilkent University, Graduate Program in Neuroscience - Master's degree thesis.

And: The Reversed Gender Gap in Education and Assortative Mating in Europe. De Hauw, Yolien, Grow, Andre, and Van Bavel, Jan. European Journal of Population,

And: Marzoli, D., Havlícek, J. and Roberts, S. C. (2017), Human mating strategies: from past causes to present consequences. WIREs Cognitive Science, e1456. doi:10.1002/wcs.1456

And: The Causes and Consequences of Women’s Competitive Beautification. Danielle J. DelPriore, Marjorie L. Prokosch, and Sarah E. Hill. The Oxford Handbook of Women and Competition, edited by Maryanne L. Fisher.

Understanding what makes terrorist groups’ propaganda effective: an integrative complexity analysis of ISIL and al Qaeda

Understanding what makes terrorist groups’ propaganda effective: an integrative complexity analysis of ISIL and Al Qaeda. Shannon C. Houck, Meredith A. Repke & Lucian Gideon Conway III. Journal of Policing, Intelligence and Counter Terrorism, Vol. 12, issue 2, Pages 105-118.

ABSTRACT: The Islamic State of Iraq and the Levant (ISIL) became an increasingly powerful terrorist organisation in a relatively short period of time, drawing more recruits than its former affiliate, Al Qaeda. Many have attributed ISIL’s successful expansion in part to its extensive propaganda platform. But what causes terrorist groups to be effective in their communication to the public? To investigate, we examined one aspect of terrorists’ rhetoric: Integrative complexity. In particular, this historical examination provides a broad integrative complexity analysis of public statements released by key members of ISIL and Al Qaeda over a 10-year period when ISIL was rapidly growing as a terrorist entity (2004–2014). Findings revealed that (a) ISIL demonstrated less complexity overall than Al Qaeda (p < .001) and (b) ISIL became increasingly less complex over this focal time period (p < .001), while Al Qaeda’s complexity remained comparatively stable (p = .69). Taken together, these data suggest that as ISIL grew in size and strength between 2004 and 2014 – surpassing Al Qaeda on multiple domains such as recruitment, monetary resources, territorial control, and arms power – it simultaneously became less complex in its communication to the public.

KEYWORDS: Terrorism, propaganda, integrative complexity, ISIL, Al Qaeda

Myths and truths about the cellular composition of the human brain: A review of influential concepts

Myths and truths about the cellular composition of the human brain: A review of influential concepts. Christopher S.Bvon Bartheld. Journal of Chemical Neuroanatomy,

•    The myth of a 10:1 glia-neuron ratio in human brains has been debunked.
•    The myth of one trillion glial cells in human brains has been debunked.
•    The number of cortical neurons does not decline significantly in normal aging.
•    All counting methods benefit from calibration and validation.
•    Proof is needed for altered cell numbers in neurological and psychiatric disorders.

Abstract: Over the last 50 years, quantitative methodology has made important contributions to our understanding of the cellular composition of the human brain. Not all of the concepts that emerged from quantitative studies have turned out to be true. Here, I examine the history and current status of some of the most influential notions. This includes claims of how many cells compose the human brain, and how different cell types contribute and in what ratios. Additional concepts entail whether we lose significant numbers of neurons with normal aging, whether chronic alcohol abuse contributes to cortical neuron loss, whether there are significant differences in the quantitative composition of cerebral cortex between male and female brains, whether superior intelligence in humans correlates with larger numbers of brain cells, and whether there are secular (generational) changes in neuron number. Do changes in cell number or changes in ratios of cell types accompany certain diseases, and should all counting methods, even the theoretically unbiased ones, be validated and calibrated? I here examine the origin and the current status of major influential concepts, and I review the evidence and arguments that have led to either confirmation or refutation of such concepts. I discuss the circumstances, assumptions and mindsets that perpetuated erroneous views, and the types of technological advances that have, in some cases, challenged longstanding ideas. I will acknowledge the roles of key proponents of influential concepts in the sometimes convoluted path towards recognition of the true cellular composition of the human brain.

Abbreviations: CNScentral nervous system
GNR glia-neuron ratio
IF isotropic fractionator

Individuals who follow and are followed by the people who correct them are significantly more likely to accept the correction than individuals confronted by strangers

Political Fact-Checking on Twitter: When Do Corrections Have an Effect? Drew Margolin, Aniko Hannak and Ingmar Weber. Political Communication,

Abstract: Research suggests that fact checking corrections have only a limited impact on the spread of false rumors. However, research has not considered that fact-checking may be socially contingent, meaning there are social contexts in which truth may be more or less preferred. In particular, we argue that strong social connections between fact-checkers and rumor spreaders encourage the latter to prefer sharing accurate information, making them more likely to accept corrections. We test this argument on real corrections made on Twitter between January 2012 and April 2014. As hypothesized, we find that individuals who follow and are followed by the people who correct them are significantly more likely to accept the correction than individuals confronted by strangers. We then replicate our findings on new data drawn from November 2015 to February, 2016. These findings suggest that the underlying social structure is an important factor in the correction of misinformation.

Keywords: accountability, fact-checking, misinformation, rumor, social networks

Land plants have regulated their stomatal conductance to allow their intrinsic water use efficiency to increase in nearly constant proportion to the rise in atmospheric [CO2]

Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis. Ralph F. Keeling et al. Proceedings of the National Academy of Sciences,

Significance: Climate change and rising CO2 are altering the behavior of land plants in ways that influence how much biomass they produce relative to how much water they need for growth. This study shows that it is possible to detect changes occurring in plants using long-term measurements of the isotopic composition of atmospheric CO2. These measurements imply that plants have globally increased their water use efficiency at the leaf level in proportion to the rise in atmospheric CO2 over the past few decades. While the full implications remain to be explored, the results help to quantify the extent to which the biosphere has become less constrained by water stress globally.

Abstract: A decrease in the 13C/12C ratio of atmospheric CO2 has been documented by direct observations since 1978 and from ice core measurements since the industrial revolution. This decrease, known as the 13C-Suess effect, is driven primarily by the input of fossil fuel-derived CO2 but is also sensitive to land and ocean carbon cycling and uptake. Using updated records, we show that no plausible combination of sources and sinks of CO2 from fossil fuel, land, and oceans can explain the observed 13C-Suess effect unless an increase has occurred in the 13C/12C isotopic discrimination of land photosynthesis. A trend toward greater discrimination under higher CO2 levels is broadly consistent with tree ring studies over the past century, with field and chamber experiments, and with geological records of C3 plants at times of altered atmospheric CO2, but increasing discrimination has not previously been included in studies of long-term atmospheric 13C/12C measurements. We further show that the inferred discrimination increase of 0.014 ± 0.007‰ ppm−1 is largely explained by photorespiratory and mesophyll effects. This result implies that, at the global scale, land plants have regulated their stomatal conductance so as to allow the CO2 partial pressure within stomatal cavities and their intrinsic water use efficiency to increase in nearly constant proportion to the rise in atmospheric CO2 concentration.

A semantic space analysis of how presidential candidates and their supporters represent abstract political concepts differently

Speaking two "Languages" in America: A semantic space analysis of how presidential candidates and their supporters represent abstract political concepts differently. Ping Li, Benjamin Schloss and  Jake Follmer. Behavior Research Methods,

Abstract: In this article we report a computational semantic analysis of the presidential candidates' speeches in the two major political parties in the USA. In Study One, we modeled the political semantic spaces as a function of party, candidate, and time of election, and findings revealed patterns of differences in the semantic representation of key political concepts and the changing landscapes in which the presidential candidates align or misalign with their parties in terms of the representation and organization of politically central concepts. Our models further showed that the 2016 US presidential nominees had distinct conceptual representations from those of previous election years, and these patterns did not necessarily align with their respective political parties' average representation of the key political concepts. In Study Two, structural equation modeling demonstrated that reported political engagement among voters differentially predicted reported likelihoods of voting for Clinton versus Trump in the 2016 presidential election. Study Three indicated that Republicans and Democrats showed distinct, systematic word association patterns for the same concepts/terms, which could be reliably distinguished using machine learning methods. These studies suggest that given an individual's political beliefs, we can make reliable predictions about how they understand words, and given how an individual understands those same words, we can also predict an individual's political beliefs. Our study provides a bridge between semantic space models and abstract representations of political concepts on the one hand, and the representations of political concepts and citizens' voting behavior on the other.

Attitudes toward science seem to become ever more polarized

Attitudes Towards Science. Bastiaan T. Rutjens et al. Advances in Experimental Social Psychology,

Abstract: As science continues to progress, attitudes toward science seem to become ever more polarized. Whereas some put their faith in science, others routinely reject and dismiss scientific evidence. This chapter provides an integration of recent research on how people evaluate science. We organize our chapter along three research topics that are most relevant to this goal: ideology, motivation, and morality. We review the relations of political and religious ideologies to science attitudes, discuss the psychological functions and motivational underpinnings of belief in science, and describe work looking at the role of morality when evaluating science and scientists. In the final part of the chapter, we apply what we know about science evaluations to the current crisis of faith in science and the open science movement. Here, we also take into account the increased accessibility and popularization of science and the (perceived) relations between science and industry.

Keywords: Science; Belief in science; Antiscience; Motivation; Ideology; Religion; Morality; Control; Order; Existential meaning; Popularization of science; Open science

Tax compliance is greater for women than men, but men are more willing to contribute to public goods

The Role of Gender in the Provision of Public Goods through Tax Compliance. David M. Bruner, John D'Attoma, Sven Steinmo. Journal of Behavioral and Experimental Economics,

•    The results of a large scale laboratory tax compliance experiment conducted in the U.S., the U.K., Sweden, and Italy with nearly 5000 subjects are reported.
•    We find significant evidence of gender differences in tax compliance and the willingness to contribute to public goods.
•    We find robust evidence that tax compliance is greater for women than men.
•    We also find evidence that men are more willing to contribute to public goods.
•    Overall, the compliance effect dominates the free-riding effect for the parameters in the experiment such that women bear a greater burden of the provision of the public good.

Abstract: The existing experimental literature suggests women are more compliant than men when paying taxes but may free ride more when contributing to public goods. It is unclear which effect dominates when paying for public goods through taxation. Experiments conducted in three European countries and the U.S. are used to investigate this issue. The results suggest that women bear a greater burden of the provision of public goods for the parameters in the experiment. The results indicate the gender gap in compliance is due to differences in both the extensive and intensive margins.

Keywords: Individual income tax; Public goods; Gender; Experiments
JEL codes:     H2; H26; C91

My comment: As if it were some kind of compensation, women hide less from taxation and smaller amounts than men, but men are more willing to contribute more if the benefits for all increase.

Friday, September 15, 2017

People believe that future others' preferences and beliefs will change to align with their own

The Belief in a Favorable Future. Todd Rogers, Don Moore and Michael Norton. Psychological Science, Volume 28, issue 9, page(s): 1290-1301,

Abstract: ***People believe that future others' preferences and beliefs will change to align with their own***. People holding a particular view (e.g., support of President Trump) are more likely to believe that future others will share their view than to believe that future others will have an opposing view (e.g., opposition to President Trump). ***Six studies demonstrated this belief in a favorable future (BFF) for political views, scientific beliefs, and entertainment and product preferences***. BFF is greater in magnitude than the tendency to believe that current others share one's views (false-consensus effect), arises across cultures, is distinct from general optimism, is strongest when people perceive their views as being objective rather than subjective, and can affect (but is distinct from) beliefs about favorable future policy changes. A lab experiment involving monetary bets on the future popularity of politicians and a field experiment involving political donations (N = 660,542) demonstrated that BFF can influence people's behavior today.

Authoritarianism and Affective Polarization: A New View on the Origins of Partisan Extremism

Authoritarianism and Affective Polarization: A New View on the Origins of Partisan Extremism. Matthew Luttig. Public Opinion Quarterly, nfx023,

Abstract: What drives affective polarization in American politics? One common argument is that Democrats and Republicans are deeply polarized today because they are psychologically different - motivated by diametrically opposed and clashing worldviews. This paper argues that the same psychological motivation - authoritarianism - is positively related to partisan extremism among both Republicans and Democrats. Across four studies, this paper shows that authoritarianism is associated with strong partisanship and heightened affective polarization among both Republicans and Democrats. Thus, strong Republicans and Democrats are psychologically similar, at least with respect to authoritarianism. As authoritarianism provides an indicator of underlying needs to belong, these findings support a view of mass polarization as nonsubstantive and group-centric, not driven by competing ideological values or clashing psychological worldviews.

Staggering SNAP benefits throughout the month leads to a 32 pct decrease in grocery store theft

SNAP Benefits and Crime: Evidence from Changing Disbursement Schedules. Jillian B. Carr and Analisa Packham. University of Miami, Oxford, OH., Department of Economics
Working Paper # - 2017-01.

Abstract: Government transfer programs infuse a substantial amount of resources into the budgets of millions of low-income families each month. Under some states' aid disbursement schemes, there are extended periods of time within each month in which no recipients receive transfers, generally limiting the amount of resources in communities. In this paper, we study the effects of nutritional aid disbursement on crime, utilizing two main sources of variation: (i) a policy change in Illinois which substantially increased the number of SNAP distribution days, and (ii) an existing Indiana policy that issues SNAP benefits by last name. We find that ***staggering SNAP benefits throughout the month leads to a 32 percent decrease in grocery store theft and reduces monthly cyclicity in grocery store crimes***. Moreover, we find that the relationship between time since SNAP issuance and crime is nonlinear. Findings show that criminal behavior decreases in the second and third weeks following receipt, but increases in the last week of the benefit cycle, potentially due to resource constraints.

My comment: Petty crime is rational most of the time... If you get government money you commit less theft, probably due to the cost (jail time, fines). If you don't get the money it pays to enter into small theft, despite possible consequences.

Obviously, impulsivity is also an issue here. They control better their spending if the money is staggered, but if they get a lump sum every month, theft increases in the last week of that month...

Students who believed that their peers were more socially connected reported lower well-being and belonging

From Misperception to Social Connection: Correlates and Consequences of Overestimating Others’ Social Connectedness. Ashley V. Whillans et al. Personality and Social Psychology Bulletin,

Abstract: Two studies document the existence and correlates of a widespread social belief, wherein individuals who have recently moved to a new social environment see their peers as more socially connected than they themselves are. In Study 1, the prevalence of this belief was documented in a large sample of first-year students (N = 1,099). In Study 2, the prevalence of this social belief was replicated in a targeted sample of university students (N = 389). Study 2 also documented both positive and negative implications of this belief. Specifically, at any given time, students who believed that their peers were more socially connected reported lower well-being and belonging. Over time, however, the belief that one’s peers are moderately more socially connected than oneself was associated with more friendship formation.

Thursday, September 14, 2017

Backward planning led to greater motivation, higher goal expectancy, less time pressure and better goal-relevant performance

Relative Effects of Forward and Backward Planning on Goal Pursuit. Jooyoung Park, Fang-Chi Lu, and William M. Hedgcock. Psychological Science,

Abstract: Considerable research has shown that planning plays an important role in goal pursuit. But how does the way people plan affect goal pursuit? Research on this question is scarce. In the current research, we examined how planning the steps required for goal attainment in chronological order (i.e., forward planning) and reverse chronological order (i.e., backward planning) influences individuals’ motivation for and perceptions of goal pursuit. Compared with forward planning, backward planning not only led to greater motivation, higher goal expectancy, and less time pressure but also resulted in better goal-relevant performance. We further demonstrated that this motivational effect occurred because backward planning allowed people to think of tasks required to reach their goals more clearly, especially when goals were complex to plan. These findings suggest that the way people plan matters just as much as whether or not they plan.

Wind farms suppressed soil moisture and enhanced water stress

The Observed Impacts of Wind Farms on Local Vegetation Growth in Northern China. Bijian Tang et al.

Abstract: Wind farms (WFs) can affect the local climate, and local climate change may influence underlying vegetation. Some studies have shown that WFs affect certain aspects of the regional climate, such as temperature and rainfall. However, there is still no evidence to demonstrate whether WFs can affect local vegetation growth, a significant part of the overall assessment of WF effects. In this research, based on the moderate-resolution imaging spectroradiometer (MODIS) vegetation index, productivity and other remote-sensing data from 2003 to 2014, the effects of WFs in the Bashang area of Northern China on vegetation growth and productivity in the summer (June–August) were analyzed. The results showed that: (1) WFs had a significant inhibiting effect on vegetation growth, as demonstrated by decreases in the leaf area index (LAI), the enhanced vegetation index (EVI), and the normalized difference vegetation index (NDVI) of approximately 14.5%, 14.8%, and 8.9%, respectively, in the 2003–2014 summers. There was also an inhibiting effect of 8.9% on summer gross primary production (GPP) and 4.0% on annual net primary production (NPP) coupled with WFs; and (2) the major impact factors might be the changes in temperature and soil moisture: WFs suppressed soil moisture and enhanced water stress in the study area. This research provides significant observational evidence that WFs can inhibit the growth and productivity of the underlying vegetation.

Keywords: wind farm impact; vegetation decrease; satellite observations; GPP; land surface temperature; land use change

My comment: Despite knowing this and many other reasons, we keep supporting wind farms...

Wheat Agriculture Induce Bigger GDP, Which Yields Smaller Family Ties

Wheat Agriculture and Family Ties. James Ang & Per Fredriksson. European Economic Review, Volume 100, November 2017, Pages 236-256,

Abstract: Several recent contributions to the literature have suggested that the strength of family ties is related to various economic and social outcomes. For example, Alesina and Giuliano (2014) highlight that the strength of family ties is strongly correlated with lower GDP and lower quality of institutions. However, the forces shaping family ties remain relatively unexplored in the literature. This paper proposes and tests the hypothesis that the agricultural legacy of a country matters for shaping the strength of its family ties. Using data from the World Values Survey and the European Values Study, the results show that societies with a legacy in cultivating wheat tend to have weaker family ties. Analysis at the sub-national level (US data) and the country level corroborate these findings. The estimations allow for alternative hypotheses which propose that pathogen stress and climatic variation can potentially also give rise to the formation of family ties. The results suggest that the suitability of land for wheat production is the most influential factor in explaining the variation in the strength of family ties across societies and countries.

Extraversion and life satisfaction: A cross-cultural examination of student and nationally representative samples

Kim, H., Schimmack, U., Oishi, S. and Tsutsui, Y. (), Extraversion and life satisfaction: A cross-cultural examination of student and nationally representative samples. Journal of Personality. Accepted Author Manuscript. doi:10.1111/jopy.12339

Method: The current study examined student and nationally representative samples from Canada, US, UK, Germany and Japan (Study 1, N = 1,460; Study 2, N = 5,882; Study 3, N =18,683; Study 4, N = 13,443; Study 5, Japan N = 952 and US N = 891). The relationship between Extraversion and life satisfaction was examined using structural equation modeling by regressing life satisfaction on the Big Five traits.

Results: Extraversion was a unique predictor of life satisfaction in the North American student and nationally representative samples (Study 1, β = .232; Study 2, β = .225; Study 5, β = .217) but the effect size was weaker or absent in other non-North American samples (Germany, UK, and Japan).

Can Superstition Create a Self-Fulfilling Prophecy? School Outcomes of Dragon Children of China

Can Superstition Create a Self-Fulfilling Prophecy? School Outcomes of Dragon Children of China. Naci Mocan and Han Yu. NBER Working Paper, August 2017,

Abstract: In Chinese culture those who are born in the year of the Dragon under the zodiac calendar are believed to be destined for good fortune and greatness, and parents prefer their kids to be born in a Dragon year. Using province level panel data we show that the number of marriages goes up during the two years preceding a Dragon year and that births jump up in a Dragon year. Using three recently collected micro data sets from China we show that those born in a Dragon year are more likely to have a college education, and that they obtain higher scores at the university entrance exam. Similarly, Chinese middle school students have higher test scores if they are born in a Dragon year. We show that these results are not because of family background, student cognitive ability, self-esteem or students’ expectations about their future. We find, however, that the “Dragon” effect on test scores is eliminated when we account for parents’ expectations about their children’s educational and professional success. We find that parents of Dragon children have higher expectations for their children in comparison to other parents, and that they invest more heavily in their children in terms of time and money. Even though neither the Dragon children nor their families are inherently different from other children and families, the belief in the prophecy of success and the ensuing investment become self-fulfilling.

Speaking about the future in the present tense may result in the belief that adverse credit events are more imminent

Languages and Corporate Savings Behavior. Shimin Chen et al. Journal of Corporate Finance, Vol. 46, October 2017, Pages 320-341,

Abstract: Speakers of strong future time reference (FTR) languages (e.g., English) are required to grammatically distinguish between future and present events, while speakers of weak-FTR languages (e.g., Chinese) are not. We hypothesize that speaking about the future in the present tense may result in the belief that adverse credit events are more imminent. Consistent with such a linguistic hypothesis, weak-FTR language firms are found to have higher precautionary cash holdings. We report additional supportive results from changes in the relative importance of different languages in a country’s business domain, evidence from within one country with several distinct languages, and results related to changes following a severe financial crisis. Our evidence introduces a new explanation for heterogeneity in corporate savings behavior, provides insights about belief formation in firms, and adds to research on the effects of languages on economic outcomes.

Marriage Gap in Christians and Muslims

Marriage Gap in Christians and Muslims. Martin Fieder et al. Journal of Biosocial Science,

Summary: For modern Western societies with a regime of monogamy, it has recently been demonstrated that the socioeconomic status of men is positively associated with being or having been married. This study aims to compare marriage patterns (if a person has been married at least once) for cultures with a tradition of monogamy and polygyny. As no worldwide data on polygyny exist, religion was used as a proxy for monogamy (Christians) vs polygyny (Muslims). The analyses were based on 2000–2011 census data from 39 countries worldwide for 52,339,594 men and women, controlling for sex, sex ratio, age, education, migration within the last 5 years and employment. Overall, a higher proportion of Muslims were married compared with Christians, but the difference in the fraction of married men compared with married women at a certain age (the ‘marriage gap’) was much more pronounced in Muslims than in Christians, i.e. compared with Christians, a substantially higher proportion of Muslim women than men were married up to the age of approximately 31 years. As expected for a tradition of polygyny, the results indicate that the socioeconomic threshold for entering marriage is higher for Muslim than Christian men, and Muslim women in particular face a negative effect of socioeconomic status on the probability of ever being married. The large ‘marriage gap’ at a certain age in Muslim societies leads to high numbers of married women and unmarried young men, and may put such polygenic societies under pressure.

Highly educated women tend to partner more often “downwards” with less educated men, rather than remaining single

The Reversed Gender Gap in Education and Assortative Mating in Europe. De Hauw, Yolien, Grow, Andre, and Van Bavel, Jan. European Journal of Population,

Abstract: While in the past men received more education than women, the gender gap in education has turned around: in recent years, more highly educated women than highly educated men are reaching the reproductive ages. Using data from the European Social Survey (rounds 1–6), we investigate the implications of this reversed gender gap for educational assortative mating. We fit multilevel multinomial regression models to predict the proportions of men and women living with a partner of a given level of education, contingent on respondents’ own educational attainment and on the cohort-specific sex ratio among the population with tertiary education at the country level. We find that highly educated women tend to partner more often “downwards” with less educated men, rather than remaining single more often. Medium educated women are found to partner less often “upwards” with highly educated men. For men, there is no evidence that they are more likely to partner with highly educated women. Rather, they are found to be living single more often. In sum, women’s advantage in higher education has affected mating patterns in important ways: while women previously tended to form unions with men who were at least as highly educated as themselves, they now tend to live with men who are at most as highly educated. Along the way, advanced education became a bonus on the mating market for women as well as for men.

In men, education is positively associated with eventual fertility

Education, Other Socioeconomic Characteristics Across the Life Course, and Fertility Among Finnish Men. Jessica Nisén et al. European Journal of Population,

Abstract: The level of education and other adult socioeconomic characteristics of men are known to associate with their fertility, but early-life socioeconomic characteristics may also be related. We studied how men’s adult and early-life socioeconomic characteristics are associated with their eventual fertility and whether the differences therein by educational level are explained or mediated by other socioeconomic characteristics. The data on men born in 1940–1950 (N = 37,082) were derived from the 1950 Finnish census, which is linked to later registers. Standard and sibling fixed-effects Poisson and logistic regression models were used. Education and other characteristics were positively associated with the number of children, largely stemming from a higher likelihood of a first birth among the more socioeconomically advantaged men. The educational gradient in the number of children was not explained by early socioeconomic or other characteristics shared by brothers, but occupational position and income in adulthood mediated approximately half of the association. Parity-specific differences existed: education and many other socioeconomic characteristics predicted the likelihood of a first birth more strongly than that of a second birth, and the mediating role of occupational position and income was also strongest for first births. Relatively small differences were found in the likelihood of a third birth. In men, education is positively associated with eventual fertility after controlling for early socioeconomic and other characteristics shared by brothers. Selective entry into fatherhood based on economic provider potential may contribute considerably to educational differentials in the number of children among men.

Enhancing a men's perception of their own mate value shifts attitude toward casual sex to very interested

Marzoli, D., Havlícek, J. and Roberts, S. C. (2017), Human mating strategies: from past causes to present consequences. WIREs Cognitive Science, e1456. doi:10.1002/wcs.1456

Abstract: In both humans and nonhuman animals, mating strategies represent a set of evolutionary adaptations aimed at promoting individual fitness by means of reproduction with the best possible partners. Given this critical role, mating strategies influence numerous aspects of human life. In particular, between-sex divergence in the intensity of intrasexual competition could account for robust cross-cultural sex differences in psychology and behavior (e.g., personality, psychiatric disorders, social behavior, violence). Several other factors (including individual differences, relationship type and environment) affect—in an evolutionarily consistent manner—variation in mating strategy that individuals pursue (as one example, awareness of one's own attractiveness impinges on mating standards). Here we provide an overview of relevant theoretical frameworks and empirical evidence on variation in mating strategies. Given its multifaceted nature and intense research interest over several decades, this is a challenging task, and we highlight areas where further investigation is warranted in order to achieve a clearer picture and resolve apparent inconsistencies. However, we suggest that addressing outstanding questions using a variety of different methodological approaches, a deeper understanding of the cognitive representations involved in mating strategies is within reach.

The long-term decline in Greenland Ice Sheet reflectivity between 2000 and 2012 might be more significant than previously thought

How robust are in situ observations for validating satellite-derived albedo over the dark zone of the Greenland Ice Sheet? J. C. Ryan et al. Ryan, J. C., A. Hubbard, T. D. Irvine-Fynn, S. H. Doyle, J. M. Cook, M. Stibal, and J. E. Box (2017), How robust are in situ observations for validating satellite-derived albedo over the dark zone of the Greenland Ice Sheet?, Geophys. Res. Lett., 44, 6218–6225, doi:10.1002/2017GL073661.

Abstract: Calibration and validation of satellite-derived ice sheet albedo data require high-quality, in situ measurements commonly acquired by up and down facing pyranometers mounted on automated weather stations (AWS). However, direct comparison between ground and satellite-derived albedo can only be justified when the measured surface is homogeneous at the length-scale of both satellite pixel and in situ footprint. Here we use digital imagery acquired by an unmanned aerial vehicle to evaluate point-to-pixel albedo comparisons across the western, ablating margin of the Greenland Ice Sheet. Our results reveal that in situ measurements overestimate albedo by up to 0.10 at the end of the melt season because the ground footprints of AWS-mounted pyranometers are insufficient to capture the spatial heterogeneity of the ice surface as it progressively ablates and darkens. Statistical analysis of 21 AWS across the entire Greenland Ice Sheet reveals that almost half suffer from this bias, including some AWS located within the wet snow zone.

Plain Language Summary

Ground measurements of reflectivity, such as those made by automated weather stations, are often used to determine the accuracy of satellite measurements. But the footprints of the instruments mounted on automated weather stations are usually much smaller than the pixel of the satellite image, meaning that comparison between the two is only justified when the surface is relatively uniform. We use high resolution imagery collected by a UAV to demonstrate that the surface of the Greenland Ice Sheet is often not uniform at the scale of both the weather station and satellite pixel due to the presence of impurities, surface water and crevasses. This means that a point measurement of reflectivity might not capture the full variability of the surface, resulting in discrepancies when compared to satellite image pixels. Furthermore, weather stations are usually located on safe areas of flat, bare ice or snow, so they usually overestimate reflectivity in comparison to the satellite pixel. We argue that if unrepresentative ground measurements are removed from satellite comparison exercises then the uncertainty in satellite products could be reduced. Hence, the long-term decline in Greenland Ice Sheet reflectivity between 2000 and 2012 might be more significant than previously thought.

Ability to rapidly and accurately compare quantities genetically linked to mathematical & general cognitive skills

Approximate number sense shares etiological overlap with mathematics and general cognitive ability. Sarah L. Lukowski et al. Intelligence,

•    Approximate number sense (ANS) has genetic overlap with mathematics
•    Findings show generalist genetic overlap among ANS, math, and general cognitive ability
•    The pattern of results suggest etiology of ANS acuity functions similar to math, g

Abstract: Approximate number sense (ANS), the ability to rapidly and accurately compare quantities presented non-symbolically, has been proposed as a precursor to mathematics skills. Earlier work reported low heritability of approximate number sense, which was interpreted as evidence that approximate number sense acts as a fitness trait. However, viewing ANS as a fitness trait is discordant with findings suggesting that individual differences in approximate number sense acuity correlate with mathematical performance, a trait with moderate genetic effects. Importantly, the shared etiology of approximate number sense, mathematics, and general cognitive ability has remained unexamined. Thus, the etiology of approximate number sense and its overlap with math and general cognitive ability was assessed in the current study with two independent twin samples (N = 451 pairs). Results suggested that ANS acuity had moderate but significant additive genetic influences. ANS also had overlap with generalist genetic mechanisms accounting for variance and covariance in mathematics and general cognitive ability. Furthermore, ANS may have genetic factors unique to covariance with mathematics beyond overlap with general cognitive ability. Evidence across both samples was consistent with the proposal that the etiology of approximate number sense functions similar to that of mathematics and general cognitive skills.

Wednesday, September 13, 2017

Political Institutions, Economic Liberty, and the Great Divergence

Political Institutions, Economic Liberty, and the Great Divergence. Gary Cox. Journal of Economic History, September 2017, Pages 724-755,

Abstract: I argue that Europe's political fragmentation interacted with her political innovations — self-governing cities and national parliaments — to facilitate “economic liberty,” which in turn unleashed faster and more inter-connected urban growth. Examining urban growth over the period 600–1800 ce throughout Eurasia, I show that inter-city growth correlations were positive and significant only in Western Europe after 1200 ce. Within Western Europe, I show that growth correlations were greatest in the most fragmented and parliamentary areas, individual cities became significantly more tied to urban growth when their realms became parliamentary, and spillover effects (due to competition between rulers) were significant.

Why Did Drug Cartels Go to War in Mexico? Subnational Party Alternation, the Breakdown of Criminal Protection, and the Onset of Large-Scale Violence

Why Did Drug Cartels Go to War in Mexico? Subnational Party Alternation, the Breakdown of Criminal Protection, and the Onset of Large-Scale Violence. Guillermo Trejo and Sandra Ley. Comparative Political Studies,

Abstract: This article explains why Mexican drug cartels went to war in the 1990s, when the federal government was not pursuing a major antidrug campaign. We argue that political alternation and the rotation of parties in state gubernatorial power undermined the informal networks of protection that had facilitated the cartels’ operations under one-party rule. Without protection, cartels created their own private militias to defend themselves from rival groups and from incoming opposition authorities. After securing their turf, they used these militias to conquer rival territory. Drawing on an original database of intercartel murders, 1995 to 2006, we show that the spread of opposition gubernatorial victories was strongly associated with intercartel violence. Based on in-depth interviews with opposition governors, we show that by simply removing top- and midlevel officials from the state attorney’s office and the judicial police — the institutions where protection was forged — incoming governors unwittingly triggered the outbreak of intercartel wars.

High sex ratios in rural China: declining well-being with age in never-married men

High sex ratios in rural China: declining well-being with age in never-married men. Zhou X, and Hesketh T. Philos Trans R Soc Lond B Biol Sci. 2017 Sep 19;372(1729). pii: 20160324. doi: 10.1098/rstb.2016.0324.

Abstract: In parts of rural China male-biased sex ratios at birth, combined with out-migration of women, have led to highly male-biased adult sex ratios, resulting in large numbers of men being unable to marry, in a culture where marriage and reproduction are an expectation. The aim of this study was to test the hypotheses that older unmarried men are more predisposed to depression, low self-esteem and aggression than both those who are married, and those who are younger and unmarried. Self-completion questionnaires were administered among men aged 20-40 in 48 villages in rural Guizhou province, southwestern China. Tools used included the Beck Depression Inventory, the Rosenberg's Self-esteem Scale and the Bryant-Smith Aggression Questionnaire. Regression models assessed psychological wellbeing while adjusting for socio-demographic variables. Completed questionnaires were obtained from 957 never-married men, 535 married men aged 30-40, 394 partnered men and 382 unpartnered men aged 20-29. After adjusting for socio-demographic variables, never-married men were more predisposed to depression (p < 0.05), aggression (p < 0.01), low self-esteem (p < 0.05) and suicidal tendencies (p < 0.001). All the psychological measures deteriorated with age in never-married men. In contrast, married men remained stable on these dimensions with age. Never-married men are a psychologically highly vulnerable group in a society where marriage is an expectation. Since the highest birth sex-ratio cohorts have not yet reached reproductive age, the social tragedy of these men will last for at least another generation.

Modern Clinical Research on LSD

Modern Clinical Research on LSD. Matthias E Liechti. Neuropsychopharmacology (2017) 42, 2114–2127; doi:10.1038/npp.2017.86

Abstract: All modern clinical studies using the classic hallucinogen lysergic acid diethylamide (LSD) in healthy subjects or patients in the last 25 years are reviewed herein. There were five recent studies in healthy participants and one in patients. In a controlled setting, LSD acutely induced bliss, audiovisual synesthesia, altered meaning of perceptions, derealization, depersonalization, and mystical experiences. These subjective effects of LSD were mediated by the 5-HT2A receptor. LSD increased feelings of closeness to others, openness, trust, and suggestibility. LSD impaired the recognition of sad and fearful faces, reduced left amygdala reactivity to fearful faces, and enhanced emotional empathy. LSD increased the emotional response to music and the meaning of music. LSD acutely produced deficits in sensorimotor gating, similar to observations in schizophrenia. LSD had weak autonomic stimulant effects and elevated plasma cortisol, prolactin, and oxytocin levels. Resting-state functional magnetic resonance studies showed that LSD acutely reduced the integrity of functional brain networks and increased connectivity between networks that normally are more dissociated. LSD increased functional thalamocortical connectivity and functional connectivity of the primary visual cortex with other brain areas. The latter effect was correlated with subjective hallucinations. LSD acutely induced global increases in brain entropy that were associated with greater trait openness 14 days later. In patients with anxiety associated with life-threatening disease, anxiety was reduced for 2 months after two doses of LSD. In medical settings, no complications of LSD administration were observed. These data should contribute to further investigations of the therapeutic potential of LSD in psychiatry.