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.
Thursday, September 14, 2017
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.
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, https://doi.org/10.1016/j.intell.2017.08.005
Highlights
• 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.
Highlights
• 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, https://doi.org/10.1017/S0022050717000729
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.
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, https://doi.org/10.1177/0010414017720703
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.
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.
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.
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.
Self-Consciousness or Misattribution Effect in the Induced Hypocrisy Paradigm?
Self-Consciousness or Misattribution Effect in the Induced Hypocrisy Paradigm? Mirror, Mirror on the Wall… Audrey Pelt, and Valérie Fointiat. Psychological Reports, https://doi.org/10.1177/0033294117730845
Abstract: In a forced compliance situation, Scheier and Carver have shown that making high private self-consciousness salient through exposure to a mirror inhibits the arousal of dissonance and the subsequent attitude change. Based on these results, the aim of our study is to examine an alternate theoretical interpretation of the absence of attitude change. From our point of view, the mirror could have the status of a misattribution cue, thus maintaining the arousal. To test this hypothesis within the induced hypocrisy paradigm, participants first completed the private self-consciousness scale. Then they took part in one of the following conditions: (1) no mirror/no hypocrisy, (2) no mirror/hypocrisy, and (3) mirror/hypocrisy. Behavioral change and psychological discomfort were measured. Results indicated that participants in the mirror/hypocrisy condition were the most inclined to change and reported the greatest psychological discomfort. These results revealed that participants experienced dissonance when exposed to the mirror and support the hypothesis of misattribution.
Abstract: In a forced compliance situation, Scheier and Carver have shown that making high private self-consciousness salient through exposure to a mirror inhibits the arousal of dissonance and the subsequent attitude change. Based on these results, the aim of our study is to examine an alternate theoretical interpretation of the absence of attitude change. From our point of view, the mirror could have the status of a misattribution cue, thus maintaining the arousal. To test this hypothesis within the induced hypocrisy paradigm, participants first completed the private self-consciousness scale. Then they took part in one of the following conditions: (1) no mirror/no hypocrisy, (2) no mirror/hypocrisy, and (3) mirror/hypocrisy. Behavioral change and psychological discomfort were measured. Results indicated that participants in the mirror/hypocrisy condition were the most inclined to change and reported the greatest psychological discomfort. These results revealed that participants experienced dissonance when exposed to the mirror and support the hypothesis of misattribution.
Misattribution of musical arousal increases sexual attraction towards opposite-sex faces in females
Misattribution of musical arousal increases sexual attraction towards opposite-sex faces in females. Manuela M. Marin et al. PLOS One, https://doi.org/10.1371/journal.pone.0183531
Abstract: Several theories about the origins of music have emphasized its biological and social functions, including in courtship. Music may act as a courtship display due to its capacity to vary in complexity and emotional content. Support for music’s reproductive function comes from the recent finding that only women in the fertile phase of the reproductive cycle prefer composers of complex melodies to composers of simple ones as short-term sexual partners, which is also in line with the ovulatory shift hypothesis. However, the precise mechanisms by which music may influence sexual attraction are unknown, specifically how music may interact with visual attractiveness cues and affect perception and behaviour in both genders. Using a crossmodal priming paradigm, we examined whether listening to music influences ratings of facial attractiveness and dating desirability of opposite-sex faces. We also tested whether misattribution of arousal or pleasantness underlies these effects, and explored whether sex differences and menstrual cycle phase may be moderators. Our sample comprised 64 women in the fertile or infertile phase (no hormonal contraception use) and 32 men, carefully matched for mood, relationship status, and musical preferences. Musical primes (25 s) varied in arousal and pleasantness, and targets were photos of faces with neutral expressions (2 s). Group-wise analyses indicated that women, but not men, gave significantly higher ratings of facial attractiveness and dating desirability after having listened to music than in the silent control condition. High-arousing, complex music yielded the largest effects, suggesting that music may affect human courtship behaviour through induced arousal, which calls for further studies on the mechanisms by which music affects sexual attraction in real-life social contexts.
Abstract: Several theories about the origins of music have emphasized its biological and social functions, including in courtship. Music may act as a courtship display due to its capacity to vary in complexity and emotional content. Support for music’s reproductive function comes from the recent finding that only women in the fertile phase of the reproductive cycle prefer composers of complex melodies to composers of simple ones as short-term sexual partners, which is also in line with the ovulatory shift hypothesis. However, the precise mechanisms by which music may influence sexual attraction are unknown, specifically how music may interact with visual attractiveness cues and affect perception and behaviour in both genders. Using a crossmodal priming paradigm, we examined whether listening to music influences ratings of facial attractiveness and dating desirability of opposite-sex faces. We also tested whether misattribution of arousal or pleasantness underlies these effects, and explored whether sex differences and menstrual cycle phase may be moderators. Our sample comprised 64 women in the fertile or infertile phase (no hormonal contraception use) and 32 men, carefully matched for mood, relationship status, and musical preferences. Musical primes (25 s) varied in arousal and pleasantness, and targets were photos of faces with neutral expressions (2 s). Group-wise analyses indicated that women, but not men, gave significantly higher ratings of facial attractiveness and dating desirability after having listened to music than in the silent control condition. High-arousing, complex music yielded the largest effects, suggesting that music may affect human courtship behaviour through induced arousal, which calls for further studies on the mechanisms by which music affects sexual attraction in real-life social contexts.
Overhearing the suggestion that the sheriff had caught the guy significantly increased false identifications
Eisen, M. L., Skerrit-Perta, A., Jones, J. M., Owen, J., and Cedré, G. C. (2017) Pre-admonition Suggestion in Live Showups: When Witnesses Learn that the Cops Caught ‘the’ Guy. Appl. Cognit. Psychol., doi: 10.1002/acp.3349
Abstract: Participants (N = 189) witnessed the theft of a computer and were immersed into what they were led to believe was an actual police investigation that culminated in a live showup. After the crime, an officer responded to the scene to take witness statements. Minutes after his arrival, the officer received a radio dispatch that could be heard clearly by the witnesses. The dispatch either stated that the Sherriff had ‘…caught the guy…’ or ‘…detained a suspect who matched the thief's description…’ and instructed the officer to bring the witnesses to identify the suspect. The witnesses then met with two deputies who conducted a live showup with an innocent suspect or the actual culprit. Choosers were more confident than rejecters across all conditions. Also, overhearing the suggestion that the sheriff had caught the guy significantly increased false identifications, and boosted witness confidence in these errors, but did not affect accurate suspect identifications.
Abstract: Participants (N = 189) witnessed the theft of a computer and were immersed into what they were led to believe was an actual police investigation that culminated in a live showup. After the crime, an officer responded to the scene to take witness statements. Minutes after his arrival, the officer received a radio dispatch that could be heard clearly by the witnesses. The dispatch either stated that the Sherriff had ‘…caught the guy…’ or ‘…detained a suspect who matched the thief's description…’ and instructed the officer to bring the witnesses to identify the suspect. The witnesses then met with two deputies who conducted a live showup with an innocent suspect or the actual culprit. Choosers were more confident than rejecters across all conditions. Also, overhearing the suggestion that the sheriff had caught the guy significantly increased false identifications, and boosted witness confidence in these errors, but did not affect accurate suspect identifications.
A female Viking warrior confirmed by genomics
Hedenstierna-Jonson C, Kjellström A, Zachrisson T, et al. A female Viking warrior confirmed by genomics. American Journal of Physical Anthropology, 2017;00:1–8. https://doi.org/10.1002/ajpa.23308
Abstract
Objectives: The objective of this study has been to confirm the sex and the affinity of an individual buried in a well-furnished warrior grave (Bj 581) in the Viking Age town of Birka, Sweden. Previously, based on the material and historical records, the male sex has been associated with the gender of the warrior and such was the case with Bj 581. An earlier osteological classification of the individual as female was considered controversial in a historical and archaeological context. A genomic confirmation of the biological sex of the individual was considered necessary to solve the issue.
Materials and methods: Genome-wide sequence data was generated in order to confirm the biological sex, to support skeletal integrity, and to investigate the genetic relationship of the individual to ancient individuals as well as modern-day groups. Additionally, a strontium isotope analysis was conducted to highlight the mobility of the individual.
Results: The genomic results revealed the lack of a Y-chromosome and thus a female biological sex, and the mtDNA analyses support a single-individual origin of sampled elements. The genetic affinity is close to present-day North Europeans, and within Sweden to the southern and south-central region. Nevertheless, the Sr values are not conclusive as to whether she was of local or nonlocal origin.
Discussion: The identification of a female Viking warrior provides a unique insight into the Viking society, social constructions, and exceptions to the norm in the Viking time-period. The results call for caution against generalizations regarding social orders in past societies.
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My comment: This is a first... Until now, female warriors were, we think, archers mounting horses.
Abstract
Objectives: The objective of this study has been to confirm the sex and the affinity of an individual buried in a well-furnished warrior grave (Bj 581) in the Viking Age town of Birka, Sweden. Previously, based on the material and historical records, the male sex has been associated with the gender of the warrior and such was the case with Bj 581. An earlier osteological classification of the individual as female was considered controversial in a historical and archaeological context. A genomic confirmation of the biological sex of the individual was considered necessary to solve the issue.
Materials and methods: Genome-wide sequence data was generated in order to confirm the biological sex, to support skeletal integrity, and to investigate the genetic relationship of the individual to ancient individuals as well as modern-day groups. Additionally, a strontium isotope analysis was conducted to highlight the mobility of the individual.
Results: The genomic results revealed the lack of a Y-chromosome and thus a female biological sex, and the mtDNA analyses support a single-individual origin of sampled elements. The genetic affinity is close to present-day North Europeans, and within Sweden to the southern and south-central region. Nevertheless, the Sr values are not conclusive as to whether she was of local or nonlocal origin.
Discussion: The identification of a female Viking warrior provides a unique insight into the Viking society, social constructions, and exceptions to the norm in the Viking time-period. The results call for caution against generalizations regarding social orders in past societies.
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My comment: This is a first... Until now, female warriors were, we think, archers mounting horses.
Enjoying the Quiet Life: Corporate Decision-Making by Entrenched Managers
Enjoying the Quiet Life: Corporate Decision-Making by Entrenched Managers. Naoshi Ikeda, Kotaro Inoue, and Sho Watanabe. NBER Working Paper No. 23804, doi 10.3386/w23804
Abstract: In this study, we empirically test “quiet life hypothesis,” which predicts that managers who are subject to weak monitoring from the shareholders avoid making difficult decisions such as risky investment and business restructuring with Japanese firm data. We employ cross-shareholder and stable shareholder ownership as the proxy variables of the strength of a manager’s defense against market disciplinary power. We examine the effect of the proxy variables on manager-enacted corporate behaviors and the results indicate that entrenched managers who are insulated from disciplinary power of stock market avoid making difficult decisions such as large investments and business restructures. However, when managers are closely monitored by institutional investors and independent directors, they tend to be active in making difficult decisions. Taken together, our results are consistent with managerial quiet life hypothesis.
My comment: We all try to work less, and we all are risk-averse...
Abstract: In this study, we empirically test “quiet life hypothesis,” which predicts that managers who are subject to weak monitoring from the shareholders avoid making difficult decisions such as risky investment and business restructuring with Japanese firm data. We employ cross-shareholder and stable shareholder ownership as the proxy variables of the strength of a manager’s defense against market disciplinary power. We examine the effect of the proxy variables on manager-enacted corporate behaviors and the results indicate that entrenched managers who are insulated from disciplinary power of stock market avoid making difficult decisions such as large investments and business restructures. However, when managers are closely monitored by institutional investors and independent directors, they tend to be active in making difficult decisions. Taken together, our results are consistent with managerial quiet life hypothesis.
My comment: We all try to work less, and we all are risk-averse...
Using Tax Data to Measure Long-Term Trends in U.S. Income Inequality
Using Tax Data to Measure Long-Term Trends in U.S. Income Inequality. Gerald Auten and David Splinter. Draft Paper, Annual Conference, ASSA Annual Meeting, 2017. https://www.aeaweb.org/conference/2017/preliminary/paper/NkfkQ2a
Abstract: Previous studies using U.S. tax return data conclude that the top one percent income share
increased substantially since 1960. This study re-estimates the long-term trend in inequality after
accounting for changes in the tax base, income sources missing from individual tax returns and
changes in marriage rates. This more consistent estimate suggests that top one percent income
shares increased by only about a quarter as much as unadjusted shares. Further, accounting for
government transfers suggests that top one percent shares increased a tenth as much. These
results show that unadjusted tax return based measures present a distorted view of inequality
trends, as incomes reported on tax returns are sensitive to changes in tax laws and ignore income
sources outside the individual tax system.
Abstract: Previous studies using U.S. tax return data conclude that the top one percent income share
increased substantially since 1960. This study re-estimates the long-term trend in inequality after
accounting for changes in the tax base, income sources missing from individual tax returns and
changes in marriage rates. This more consistent estimate suggests that top one percent income
shares increased by only about a quarter as much as unadjusted shares. Further, accounting for
government transfers suggests that top one percent shares increased a tenth as much. These
results show that unadjusted tax return based measures present a distorted view of inequality
trends, as incomes reported on tax returns are sensitive to changes in tax laws and ignore income
sources outside the individual tax system.
Land-Use Restrictions -- deregulating to 1980 levels would raise labor productivity by about 10 pct, & consumption by about 9 pct
Tarnishing the Golden and Empire States: Land-Use Restrictions and the U.S. Economic Slowdown. Kyle F. Herkenhoff, Lee E. Ohanian, Edward C. Prescott. NBER Working Paper No. 23790, http://www.nber.org/papers/w23790
This paper studies the impact of state-level land-use restrictions on U.S. economic activity, focusing on how these restrictions have depressed macroeconomic activity since 2000. We use a variety of state-level data sources, together with a general equilibrium spatial model of the United States to systematically construct a panel dataset of state-level land-use restrictions between 1950 and 2014. We show that these restrictions have generally tightened over time, particularly in California and New York. We use the model to analyze how these restrictions affect economic activity and the allocation of workers and capital across states. Counterfactual experiments show that deregulating existing urban land from 2014 regulation levels back to 1980 levels would have increased US GDP and productivity roughly to their current trend levels. California, New York, and the Mid-Atlantic region expand the most in these counterfactuals, drawing population out of the South and the Rustbelt. General equilibrium effects, particularly the reallocation of capital across states, accounts for much of these gains.
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Knowing this:
"...deregulating [land use in] all of the regions to 1980 levels would raise labor productivity by about 10 percent, and consumption by about 9 percent in the neoclassical economy, and would raise labor productivity by about 16 percent, and consumption by about 11 percent in the economy with the externality."
, we keep shooting ourselves in the foot.
This paper studies the impact of state-level land-use restrictions on U.S. economic activity, focusing on how these restrictions have depressed macroeconomic activity since 2000. We use a variety of state-level data sources, together with a general equilibrium spatial model of the United States to systematically construct a panel dataset of state-level land-use restrictions between 1950 and 2014. We show that these restrictions have generally tightened over time, particularly in California and New York. We use the model to analyze how these restrictions affect economic activity and the allocation of workers and capital across states. Counterfactual experiments show that deregulating existing urban land from 2014 regulation levels back to 1980 levels would have increased US GDP and productivity roughly to their current trend levels. California, New York, and the Mid-Atlantic region expand the most in these counterfactuals, drawing population out of the South and the Rustbelt. General equilibrium effects, particularly the reallocation of capital across states, accounts for much of these gains.
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Knowing this:
"...deregulating [land use in] all of the regions to 1980 levels would raise labor productivity by about 10 percent, and consumption by about 9 percent in the neoclassical economy, and would raise labor productivity by about 16 percent, and consumption by about 11 percent in the economy with the externality."
, we keep shooting ourselves in the foot.
Tuesday, September 12, 2017
Love Death—A Retrospective and Prospective Follow-Up Mortality Study Over 45 Years
Lange L, Zedler B, Verhoff MA, Parzeller M. Love Death—A Retrospective and Prospective Follow-Up Mortality Study Over 45 Years. The Journal of Sexual Medicine, https://doi.org/10.1016/j.jsxm.2017.08.007
Abstract
Background: Although sexual activity can cause moderate stress, it can cause natural death in individuals with pre-existing illness. The aim of this study was to identify additional pre-existing health problems, sexual practices, and potential circumstances that may trigger fatal events.
Methods: This medicolegal postmortem, retrospective, and prospective study is based on data of autopsies performed at the Institute of Legal Medicine of the University hospital, Goethe-University, Frankfurt/Main, Germany.
Outcomes: Identification of pre-existing health problems, sexual practices, and potential circumstances than could trigger fatal events.
Results: From 1972 to 2016 (45 years) approximately 38,000 medicolegal autopsies were performed, of which 99 cases of natural death were connected to sexual activities (0.26%). Except for eight women, men represented most cases. The women’s mean age was 45 years (median = 45) and the men’s mean age was 57.2 years (median = 57). Causes of death were coronary heart disease (n = 28), myocardial infarction (n = 21) and reinfarction (n = 17), cerebral hemorrhage (n = 12), rupture of aortic aneurysms (n = 8), cardiomyopathy (n = 8), acute heart failure (n = 2), sudden cardiac arrest (n = 1), myocarditis (n = 1), and a combination of post myocardial infarction and cocaine intoxication (n = 1). Most cases showed increased heart weights and body mass indices. Death occurred mainly during the summer and spring and in the home of the deceased. If sexual partners were identified, 34 men died during or after sexual contact with a female prostitute, two cases at least two female prostitutes. Nine men died during or after sexual intercourse with their wife, in seven cases the sexual partner was a mistress, and in four cases the life partner. Five men died during homosexual contacts. Based on the situation 30 men were found in, death occurred during masturbation. Of the women, five died during intercourse with the life partner, two died during intercourse with a lover or friend, and in one case no information was provided.
Clinical Translation: Natural deaths connected with sexual activity appear to be associated with male sex and pre-existing cardiovascular disorders. Most cases recorded occurred with mistresses, prostitutes, or during masturbation. If death occurs, the spouse or life partner might need psychological support.
Strength and Limitations: To our knowledge, the present study contains the largest collection of postmortem data on natural deaths connected with sexual activities. However, the cases presented were of forensic interest; a larger number of undetected cases especially in the marital or stable relationship sector must be assumed.
Conclusion: Patients should be informed about the circumstances that could trigger the “love death.”
Key Words: Sudden Natural Death; Sexual Activity; Autopsy; Myocardial Infarction; Cerebral Hemorrhage; Circumstances of Death
Abstract
Background: Although sexual activity can cause moderate stress, it can cause natural death in individuals with pre-existing illness. The aim of this study was to identify additional pre-existing health problems, sexual practices, and potential circumstances that may trigger fatal events.
Methods: This medicolegal postmortem, retrospective, and prospective study is based on data of autopsies performed at the Institute of Legal Medicine of the University hospital, Goethe-University, Frankfurt/Main, Germany.
Outcomes: Identification of pre-existing health problems, sexual practices, and potential circumstances than could trigger fatal events.
Results: From 1972 to 2016 (45 years) approximately 38,000 medicolegal autopsies were performed, of which 99 cases of natural death were connected to sexual activities (0.26%). Except for eight women, men represented most cases. The women’s mean age was 45 years (median = 45) and the men’s mean age was 57.2 years (median = 57). Causes of death were coronary heart disease (n = 28), myocardial infarction (n = 21) and reinfarction (n = 17), cerebral hemorrhage (n = 12), rupture of aortic aneurysms (n = 8), cardiomyopathy (n = 8), acute heart failure (n = 2), sudden cardiac arrest (n = 1), myocarditis (n = 1), and a combination of post myocardial infarction and cocaine intoxication (n = 1). Most cases showed increased heart weights and body mass indices. Death occurred mainly during the summer and spring and in the home of the deceased. If sexual partners were identified, 34 men died during or after sexual contact with a female prostitute, two cases at least two female prostitutes. Nine men died during or after sexual intercourse with their wife, in seven cases the sexual partner was a mistress, and in four cases the life partner. Five men died during homosexual contacts. Based on the situation 30 men were found in, death occurred during masturbation. Of the women, five died during intercourse with the life partner, two died during intercourse with a lover or friend, and in one case no information was provided.
Clinical Translation: Natural deaths connected with sexual activity appear to be associated with male sex and pre-existing cardiovascular disorders. Most cases recorded occurred with mistresses, prostitutes, or during masturbation. If death occurs, the spouse or life partner might need psychological support.
Strength and Limitations: To our knowledge, the present study contains the largest collection of postmortem data on natural deaths connected with sexual activities. However, the cases presented were of forensic interest; a larger number of undetected cases especially in the marital or stable relationship sector must be assumed.
Conclusion: Patients should be informed about the circumstances that could trigger the “love death.”
Key Words: Sudden Natural Death; Sexual Activity; Autopsy; Myocardial Infarction; Cerebral Hemorrhage; Circumstances of Death
Are Ideas Getting Harder to Find?
Are Ideas Getting Harder to Find? Nicholas Bloom, Charles I. Jones, John Van Reenen, and Michael Webb. NBER Working Paper No. 23782. www.nber.org/papers/w23782
In many growth models, economic growth arises from people creating ideas, and the long-run growth rate is the product of two terms: the effective number of researchers and their research productivity. We present a wide range of evidence from various industries, products, and firms showing that research effort is rising substantially while research productivity is declining sharply. A good example is Moore's Law. The number of researchers required today to achieve the famous doubling every two years of the density of computer chips is more than 18 times larger than the number required in the early 1970s. Across a broad range of case studies at various levels of (dis)aggregation, we find that ideas — and in particular the exponential growth they imply — are getting harder and harder to find. Exponential growth results from the large increases in research effort that offset its declining productivity.
In many growth models, economic growth arises from people creating ideas, and the long-run growth rate is the product of two terms: the effective number of researchers and their research productivity. We present a wide range of evidence from various industries, products, and firms showing that research effort is rising substantially while research productivity is declining sharply. A good example is Moore's Law. The number of researchers required today to achieve the famous doubling every two years of the density of computer chips is more than 18 times larger than the number required in the early 1970s. Across a broad range of case studies at various levels of (dis)aggregation, we find that ideas — and in particular the exponential growth they imply — are getting harder and harder to find. Exponential growth results from the large increases in research effort that offset its declining productivity.
When Will Negotiation Agents Be Able to Represent Us? The Challenges and Opportunities for Autonomous Negotiators
When Will Negotiation Agents Be Able to Represent Us? The Challenges and Opportunities for Autonomous Negotiators. Tim Baarslag, Michael Kaisers, Enrico H. Gerding, Catholijn M. Jonker, and Jonathan Gratch. Proceedings of the Twenty-Sixth International Joint Conference on Artificial Intelligence. AI and autonomy track. Pages 4684-4690. https://doi.org/10.24963/ijcai.2017/653
Abstract: Computers that negotiate on our behalf hold great promise for the future and will even become indispensable in emerging application domains such as the smart grid and the Internet of Things. Much research has thus been expended to create agents that are able to negotiate in an abundance of circumstances. However, up until now, truly autonomous negotiators have rarely been deployed in real-world applications. This paper sizes up current negotiating agents and explores a number of technological, societal and ethical challenges that autonomous negotiation systems have brought about. The questions we address are: in what sense are these systems autonomous, what has been holding back their further proliferation, and is their spread something we should encourage? We relate the automated negotiation research agenda to dimensions of autonomy and distill three major themes that we believe will propel autonomous negotiation forward: accurate representation, long-term perspective, and user trust. We argue these orthogonal research directions need to be aligned and advanced in unison to sustain tangible progress in the field.
Abstract: Computers that negotiate on our behalf hold great promise for the future and will even become indispensable in emerging application domains such as the smart grid and the Internet of Things. Much research has thus been expended to create agents that are able to negotiate in an abundance of circumstances. However, up until now, truly autonomous negotiators have rarely been deployed in real-world applications. This paper sizes up current negotiating agents and explores a number of technological, societal and ethical challenges that autonomous negotiation systems have brought about. The questions we address are: in what sense are these systems autonomous, what has been holding back their further proliferation, and is their spread something we should encourage? We relate the automated negotiation research agenda to dimensions of autonomy and distill three major themes that we believe will propel autonomous negotiation forward: accurate representation, long-term perspective, and user trust. We argue these orthogonal research directions need to be aligned and advanced in unison to sustain tangible progress in the field.
The Role of a "Common Is Moral" Heuristic in the Stability and Change of Moral Norms
The Role of a "Common Is Moral" Heuristic in the Stability and Change of Moral Norms. Lindström B, Jangard S, Selbing I, and Olsson A. J Exp Psychol Gen. 2017, Sep 11, https://doi.org/10.1037/xge0000365
Abstract: Moral norms are fundamental for virtually all social interactions, including cooperation. Moral norms develop and change, but the mechanisms underlying when, and how, such changes occur are not well-described by theories of moral psychology. We tested, and confirmed, the hypothesis that the commonness of an observed behavior consistently influences its moral status, which we refer to as the common is moral (CIM) heuristic. In 9 experiments, we used an experimental model of dynamic social interaction that manipulated the commonness of altruistic and selfish behaviors to examine the change of peoples' moral judgments. We found that both altruistic and selfish behaviors were judged as more moral, and less deserving of punishment, when common than when rare, which could be explained by a classical formal model (social impact theory) of behavioral conformity. Furthermore, judgments of common versus rare behaviors were faster, indicating that they were computationally more efficient. Finally, we used agent-based computer simulations to investigate the endogenous population dynamics predicted to emerge if individuals use the CIM heuristic, and found that the CIM heuristic is sufficient for producing 2 hallmarks of real moral norms; stability and sudden changes. Our results demonstrate that commonness shapes our moral psychology through mechanisms similar to behavioral conformity with wide implications for understanding the stability and change of moral norms.
Abstract: Moral norms are fundamental for virtually all social interactions, including cooperation. Moral norms develop and change, but the mechanisms underlying when, and how, such changes occur are not well-described by theories of moral psychology. We tested, and confirmed, the hypothesis that the commonness of an observed behavior consistently influences its moral status, which we refer to as the common is moral (CIM) heuristic. In 9 experiments, we used an experimental model of dynamic social interaction that manipulated the commonness of altruistic and selfish behaviors to examine the change of peoples' moral judgments. We found that both altruistic and selfish behaviors were judged as more moral, and less deserving of punishment, when common than when rare, which could be explained by a classical formal model (social impact theory) of behavioral conformity. Furthermore, judgments of common versus rare behaviors were faster, indicating that they were computationally more efficient. Finally, we used agent-based computer simulations to investigate the endogenous population dynamics predicted to emerge if individuals use the CIM heuristic, and found that the CIM heuristic is sufficient for producing 2 hallmarks of real moral norms; stability and sudden changes. Our results demonstrate that commonness shapes our moral psychology through mechanisms similar to behavioral conformity with wide implications for understanding the stability and change of moral norms.
Our moral balance sheet: Compensating our bad and good deeds
An experimental analysis of moral self-regulation. Erdem Seçilmiş. Applied Economics Letters, http://dx.doi.org/10.1080/13504851.2017.1374530
ABSTRACT: This article examines the validity of the moral self-regulation hypothesis in a laboratory setting. The experiment is comprised of a public good game preceded or followed by a matrix task. The data show that the recall of an immoral action (cheating in the matrix task) motivates the individual to do morally right thing (contributing to group account) and the recall of a moral action (contributing to group account) motivates the individual to act out self-interest (cheating in the matrix task). Both moral licensing and moral cleansing hypotheses are confirmed by the results of the experiment. Additionally, the findings indicate that the subjects who had been given a chance to cheat ‘at first’ allocated more funds to the group account; and the subjects who had been given a chance to voluntarily contribute ‘at first’ cheated more in the matrix task.
KEYWORDS: Moral self-regulation, moral cleansing, moral licensing, public good game, matrix task
JEL CLASSIFICATION: C90, C91, D03
ABSTRACT: This article examines the validity of the moral self-regulation hypothesis in a laboratory setting. The experiment is comprised of a public good game preceded or followed by a matrix task. The data show that the recall of an immoral action (cheating in the matrix task) motivates the individual to do morally right thing (contributing to group account) and the recall of a moral action (contributing to group account) motivates the individual to act out self-interest (cheating in the matrix task). Both moral licensing and moral cleansing hypotheses are confirmed by the results of the experiment. Additionally, the findings indicate that the subjects who had been given a chance to cheat ‘at first’ allocated more funds to the group account; and the subjects who had been given a chance to voluntarily contribute ‘at first’ cheated more in the matrix task.
KEYWORDS: Moral self-regulation, moral cleansing, moral licensing, public good game, matrix task
JEL CLASSIFICATION: C90, C91, D03
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