Sunday, December 20, 2020

Why are Bats a Reservoir of Virulent Zoonotic Diseases? Inter alia, colonies can reach densities of 3000 bats/sq.m., in populations of up to a million individuals per roost

On the Evolution of Virulent Zoonotic Viruses in Bats. Frans L. Roes. Biological Theory volume 15, pages223–225(2020). https://link.springer.com/article/10.1007/s13752-020-00363-6

Abstract: Ideas formulated by Paul Ewald about the “evolution of virulence” are used to explain why bats, more often than other mammals, are a reservoir of virulent viruses, and why many of these viruses severely affect other mammals, including humans, but are apparently less pathogenic for bats. Potential factors contributing to bat viruses often being zoonotic are briefly discussed.


Why are Bats, More Than Other Mammals, a Reservoir of Virulent Zoonotic Diseases?

Bats harbor a significantly higher proportion of zoonotic viruses than all other mammalian orders (Olival et al. 2017, p. 646; disputed by Mollentze and Streicker 2020; see also Watson 2020). This is remarkable because, for instance, there are about twice as many species of rodents as there are species of bats, and rodents are more closely related to humans than bats are. Why are bats a reservoir of virulent viruses?

Many bat species are gregarious, some living in dense aggregations. Colonies can reach densities of 3000 bats per square meter, in populations of up to a million individuals per roost (Luis et al. 2013, p. 2). The theory of virulence implicates the close quarters of bats as a factor favoring increased virulence because bats roost so closely to each other that they can transmit infections to other bats even if they are immobilized by illness. A more virulent variant, making more copies of itself, will therefore spread. Note that it is not closeness per se that favors virulent diseases, but closeness favors transmission from animals that are not mobile.

To summarize: the extreme closeness of bats in many roosting sites allows the transmission of viruses from very sick hosts, favoring the more virulent variants in the population.

Why are many bat viruses also zoonotic? Several characteristics of bats seem to facilitate transmission to other host species. Bats are the only mammals with the capability of powered flight. This enables them to have a longer radius of action compared to terrestrial mammals and to have more direct or indirect contact with other animal species at different geographical locations. The mobility of bats probably allows bat viruses to be dispersed to humans and other mammals.

Whereas rodent species typically do not share communal nesting sites, roosting sites of bats can house diverse assemblages of multiple bat species (Luis et al. 2013, p. 3). This also may favor zoonosis. In the words of Ewald (pers. comm.): “The important point here is that multispecies populations may favor infection mechanisms that are not species specific and may thus allow for more frequent transmission across species including zoonotic transmission to humans.”

Finally, bats enjoy remarkable longevity for their body size. Some insectivorous bats can live up to 35 years (Wang et al. 2011, p. 650). Persistent infections may allow for prolonged release of viruses and thus greater exposure of humans (or other species) to the viruses.


Sixteen facial expressions occur in similar contexts worldwide

Sixteen facial expressions occur in similar contexts worldwide. Alan S. Cowen, Dacher Keltner, Florian Schroff, Brendan Jou, Hartwig Adam & Gautam Prasad. Nature, Dec 16 2020. https://www.nature.com/articles/s41586-020-3037-7

Abstract: Understanding the degree to which human facial expressions co-vary with specific social contexts across cultures is central to the theory that emotions enable adaptive responses to important challenges and opportunities1,2,3,4,5,6. Concrete evidence linking social context to specific facial expressions is sparse and is largely based on survey-based approaches, which are often constrained by language and small sample sizes7,8,9,10,11,12,13. Here, by applying machine-learning methods to real-world, dynamic behaviour, we ascertain whether naturalistic social contexts (for example, weddings or sporting competitions) are associated with specific facial expressions14 across different cultures. In two experiments using deep neural networks, we examined the extent to which 16 types of facial expression occurred systematically in thousands of contexts in 6 million videos from 144 countries. We found that each kind of facial expression had distinct associations with a set of contexts that were 70% preserved across 12 world regions. Consistent with these associations, regions varied in how frequently different facial expressions were produced as a function of which contexts were most salient. Our results reveal fine-grained patterns in human facial expressions that are preserved across the modern world.


It is argued that when cultural values provide a rationale for ostracism, this can eliminate ostracism distress

Can cultural values eliminate ostracism distress? Erez Yaakobi. International Journal of Intercultural Relations, Volume 80, January 2021, Pages 231-241. https://doi.org/10.1016/j.ijintrel.2020.10.014

Abstract: Ostracism has negative psychological and behavioral outcomes, thus making it crucial to better understand how these effects can be mitigated. Two experiments tested whether cultural values can moderate immediate as well as delayed reactions to ostracism in two populations with very different values concerning interactions with the opposite sex. The Ultra-Orthodox population in Israel constitutes a specific subculture whose values differ considerably from those of secular Jews in Israel. In particular, Ultra-Orthodox Jews adhere to strict separation between genders, which is enforced by Ultra-Orthodox men. It was hypothesized that being ostracized by the opposite gender on a computer game would be less distressing in particular for Ultra-Orthodox men than for secular men and women who cultural values have no such prohibition. In both experiments, Jewish secular and Ultra-Orthodox men and women played Cyberball, a virtual ball-toss game against two ostensible players (half same gender, half opposite, but all with their in-groups). The findings showed that whereas secular men and women were more distressed when ostracized by a member of the opposite sex, Ultra-Orthodox males reported lower distress on both the needs satisfaction and mood measures after they were ostracized by ostensible Ultra-Orthodox female players than when receiving fewer ball tosses from ostensible Ultra-Orthodox male players. It is argued that when cultural values provide a rationale for ostracism, this can eliminate ostracism distress. The discussion centers on ways cultural and other embedded values can mitigate the negative outcomes of ostracism.

Keywords: OstracismCultureSocial exclusionValuesReligious observance

General discussion

These two experiments explored whether cultural values moderate ostracism effects on needs satisfaction and mood immediately after participants were ostracized on the Cyberball game as well as after a short delay in a culture where gender ostracism is intrinsic. The findings support these hypotheses. Specifically, when Ultra-Orthodox Jewish males were ostracized by ostensible Ultra-Orthodox Jewish females, they reported significantly lower distress than when ostracized by ostensible Ultra-Orthodox male players. On the mood measure, these cultural values not only alleviated the ostracism effects but eliminated ostracism distress altogether in the reflective stage. Thus, robustly embedded cultural values appear to influence even immediate responses that require fewer cognitive efforts to process this experience. The results also provide empirical evidence that may help account for one of the mechanisms that may mitigate distress after being ostracized by showing that cultural worldview can mediate ostracism distress when this cultural worldview is not threatened, and that cultural values provide a “reasonable explanation” for being ostracized.

Future research should examine whether other mechanisms can eliminate ostracism distress by exploring other strongly embedded factors. Fiske and Yamamoto (2005) as well as Pfundmair, Graupmann, Frey, and Aydin (2015) showed that members of collectivistic cultures tend to focus on belonging securely and trusting more narrowly (primarily in-group members; Yamagishi, 1988) and hence may exhibit more cautiousness in their responses when ostracized by out-group members. The findings also respond to the call by Uskul and Over (2017) to examine whether socially interdependent individuals might be more negatively affected when ostracism comes from in-group members or close others that matter to them. It is thus important to explore whether being ostracized within a group contradicts or is consistent with the cultural values and inherited worldviews of this group. The current experiments showed that ostracism was mitigated when the group's cultural values considers gendered ostracism to be "normal". The current research also provides insights into the way cultures vary along multiple dimensions, since responses to ostracism are likely to be influenced by different social factors including social norms and values (Gelfand, 2012).

These findings have practical implications as well. If the target of an ostracism experience comes from a culture where social distance is a value or is valued in some defined circumstances, reminders of this value could shield victims from its negative emotional effects or lessen them. The results also provide a better understanding of how to allocate limited resources to people who are being ostracized by better identifying, at least initially, who will be more prone to be affected by an ostracism experience. If someone is ostracized, interventions could make clear that there could be reasons such as cultural values that may have nothing to do with the ostracizer's attitude towards the ostracized. Facilitating the value of participation and collaboration plays an important role in augmenting one's wellbeing since values have significant effects on ostracism distress. Thus, making cultural values more salient in one's mind may serve as an intervention mechanism for buffering ostracism distress.

The current research also has limitations that deserve mention. It implemented an experimental design that restricts the generalizability of the findings. Future work should test the moderation model on a broader range of populations. Future experiments could also explore whether the desire to adhere to cultural values is heightened as a function of ostracism and use instruments beyond self-report measures to test the effects of ostracism and the moderation model. Furthermore, future research should replicate this study in other cultures with similar values in terms of strict gender rules. It could be argued that the response of Ultra-Orthodox males when playing Cyberball against Ultra-Orthodox women was related to the incongruity of the situation for them. However, this possible reaction was taken into consideration prior to conducting the experiment. All participants were told that the other "players" were sitting in different rooms on campus and that the "computer" chooses the people taking part in each game. The research assistant was specifically instructed to present the choice of the "other players" as a random assignment by the computer. This also eliminated alternative explanations for the results. In addition, these studies used a repeated-measure design where participants completed questionnaires twice (immediate and delayed responses). This was done to better capture when moderation would occur. However, potential order effects may have occurred. Thus, future studies should also use a between-subject research design to reexamine these effects. Finally, other differences that may also moderate this mediation effect should be explored since they are embedded in the ways individuals perceive social connections.

Not only individuals overestimate their intelligence & do so particularly for domains in which they perform poorly; estimates given by others are equally accurate or sometimes even more accurate than self-estimates

Chp 49 - Self- and Other-Estimates of Intelligence. Aljoscha C. Neubauer, Gabriela Hofer. In The Cambridge Handbook of Intelligence, Edited by Robert J. Sternberg, 2020, pp 1179-1200. https://doi.org/10.1017/9781108770422.050

Summary: It is a widely held view that “nobody knows you better than yourself.” However, the low validity of self-estimates of intelligence and other abilities indicated by a considerable body of research does not support this notion. Individuals overestimate themselves and do so particularly for domains in which they perform poorly (the so-called Dunning-Kruger effect). Interestingly, intelligence estimates given by others are equally accurate or sometimes even more accurate than self-estimates. This chapter provides an overview of research on self- and other-estimates of intelligence and potential moderators of their accuracy. It also aims to bring the research lines on self- and other-estimates of intelligence together within the framework of the self-other knowledge asymmetry (SOKA) model proposed by Simine Vazire. The ability to predict for which intelligence subfactors one of the two perspectives might provide more accurate estimates has implications for both research and practical fields like vocational counseling.



Gender Differences in Competition & Evidence From a Matrilineal & a Patriarchal Society: Maasai men opt to compete at roughly twice the rate as Maasai women; Khasi women choose the competitive environment more often than men

From 2009... Gender Differences in Competition: Evidence From a Matrilineal and a Patriarchal Society. Uri Gneezy  Kenneth L. Leonard  John A. List. Econometrica, October 6 2009. https://onlinelibrary.wiley.com/doi/abs/10.3982/ECTA6690

Abstract: We use a controlled experiment to explore whether there are gender differences in selecting into competitive environments across two distinct societies: the Maasai in Tanzania and the Khasi in India. One unique aspect of these societies is that the Maasai represent a textbook example of a patriarchal society, whereas the Khasi are matrilineal. Similar to the extant evidence drawn from experiments executed in Western cultures, Maasai men opt to compete at roughly twice the rate as Maasai women. Interestingly, this result is reversed among the Khasi, where women choose the competitive environment more often than Khasi men, and even choose to compete weakly more often than Maasai men. These results provide insights into the underpinnings of the factors hypothesized to be determinants of the observed gender differences in selecting into competitive environments.


Rolf Degen summarizing... The personality trait that keeps people most strongly from infidelity is the "dutifulness" component of conscientiousness

The five factor model and infidelity: Beyond the broad domains. C.J.J. van Zyl. Personality and Individual Differences, Volume 172, April 2021, 110553. https://doi.org/10.1016/j.paid.2020.110553

Rolf Degen's take: https://twitter.com/DegenRolf/status/1340167816910090240

Abstract: Several studies have explored the association between personality and infidelity, but our understanding of this relationship is arguably underdeveloped. The fact that most research only examined domain-level effects may have contributed to the situation, as facet-level and item- level information have not sufficiently been taken into consideration. This paper argues that it is an unwarranted assumption that domain-level associations reveal all there is to know about the relationship between personality and infidelity, and proceeds to examine this claim. The present study investigates the association between personality and infidelity but goes beyond the Big Five domains to examine facet and item-level associations in a sample of 685 participants. Bayesian logistic modeling with comprehensive indicators of uncertainty are provided for all models predicting infidelity. Results suggest that two facets in particular are associated with infidelity and that facet and item models contains additional predictive information compared to the broad domains. Findings further suggest that facets and items provide more nuanced information than can be gleaned from domain-level effects, which in turn, could advance our understanding of personality and its association with infidelity.

Keywords: Five-factor modelPersonalityInfidelityCheatingDomainsFacetsNuances


COVID-19 until Aug 2020: Overall, we find that fear steadily decreased after a peak in April 2020; elevated fear was predicted by region (i.e., North America), anxious traits, and media use

Mertens, GaĆ«tan, Stefanie Duijndam, Paul Lodder, and Tom Smeets. 2020. “Pandemic Panic? Results of a 6-month Longitudinal Study on Fear of COVID-19.” PsyArXiv. December 18. doi:10.31234/osf.io/xtu3f

Abstract: Fear is an evolutionary adaptive emotion that serves to protect the organism from harm. Once a threat diminishes, fear should also dissipate as otherwise fear may become chronic and pathological. While threat (i.e., number of infections, hospitalizations and deaths) during the ongoing COVID-19 pandemic has substantially varied over time, it remains unclear whether fear has followed a similar pattern. To examine the development of fear of COVID-19 and investigate potential predictors for chronic fear, we conducted a large online longitudinal study (N = 2000) using the Prolific platform. Participants represented unselected residents of 34 different countries. The Fear of the Coronavirus Questionnaire (FCQ) and several other demographic and psychological measures were completed monthly between March and August 2020. Overall, we find that fear steadily decreased after a peak in April 2020. Additional analyses showed that elevated fear was predicted by region (i.e., North America), anxious traits, and media use.


Bisexual disclosure was positively associated with well-being after accounting for the contribution of sexual minority disclosure

Brownfield, J. M., & Brown, C. (2020). The relations among outness, authenticity, and well-being for bisexual adults. Psychology of Sexual Orientation and Gender Diversity, Dec 2020. https://doi.org/10.1037/sgd0000390

Abstract: Outness, a proximal minority stressor for sexual minority people, consists of 2 subconstructs (disclosure and concealment) and demonstrates relationships with mental health outcomes such as well-being. Newly studied, authenticity may be related to outness and to mental health outcomes, potentially influencing the outness-well-being relationship. Additionally, a majority of research has examined minority stressors for lesbians and gay men, and few studies have investigated the unique experiences of bisexual individuals. The present study examined the associations of 2 subconstructs of outness—disclosure and concealment (as a sexual minority and specifically as bisexual)—with bisexual adults’ well-being and whether authenticity mediated the relationship between these subconstructs of outness and well-being. Four-hundred and 47 bisexual participants completed an online survey. Analyses revealed that bisexual disclosure was positively associated with well-being after accounting for the contribution of sexual minority disclosure, whereas bisexual concealment was not associated with well-being when accounting for the contribution of sexual minority concealment. Authenticity mediated the relationship between bisexual disclosure and well-being, and it mediated the relationship between bisexual concealment and well-being. Results further our understanding of bisexual individuals’ mental health, particularly in regards to bisexual disclosure and concealment.


Thus, we cannot conclude from this study that lies always travel faster than the truth

Bruns, Axel & Keller, Tobias (2020) News diffusion on Twitter: Comparing the dissemination careers for mainstream and marginal news. In International Conference on Social Media and Society, 2020-07-22 - 2020-07-24. (Unpublished). https://eprints.qut.edu.au/202868/

Description: Current scholarly as well as mainstream media discussion expresses substantial concerns about the influence of ‘problematic information’ (Jack 2017) from hyperpartisan and downright fraudulent news sources on public debate and public opinion formation (e.g., Humprecht 2018). Often encapsulated by the imprecise term ‘fake news’, the publishers of such content seek to exploit network effects, that is, the absence of echo chambers and filter bubbles in social media spaces (Bruns 2019) to maximise the visibility and dissemination of their content. They do so for a combination of political and commercial reasons (Wardle & Derakhshan 2017). Some recent studies – most prominently an article by Vosoughi et al. (2018) in Science, examining story dissemination on Twitter – present evidence that such marginal, hyperpartisan and propagandist sites are outpacing their more mainstream counterparts in the dissemination of content: put simply, ‘fake news’ content seems to spread more quickly across social networks than ‘real news’. The generalisability of such findings is limited, however, by the source data: for instance, to establish a comparison between ‘real’ and ‘fake’ news, Vosoughi et al. (2018) consider only news stories that were evaluated by a fact-checking organisation. But this introduces a systematic bias: news stories that were dubious or controversial enough to warrant fact-checking may well disseminate in entirely different ways from stories that are more obviously truthful or incorrect. Uncontroversially truthful stories from mainstream news outlets could well disseminate across Twitter with greater speed than the ‘fake news’ content observed by Vosoughi et al., but such stories would not have been included in their analysis unless they had been fact-checked. Thus, we cannot conclude from this study that lies always travel faster than the truth.


Saturday, December 19, 2020

Is the Myth of Left-wing Authoritarianism Itself a Myth?

Conway, Lucian G., III, Alivia Zubrod, Linus Chan, James McFarland, and Evert Van de Vliert. 2020. “Is the Myth of Left-wing Authoritarianism Itself a Myth?.” PsyArXiv. December 18. doi:10.31234/osf.io/frcks

Abstract: Is left-wing authoritarianism (LWA) closer to a myth or a reality? Twelve studies test the empirical existence and theoretical relevance of LWA. Study 1 reveals that both conservative and liberal Americans identify a large number of left-wing authoritarians in their lives. In Study 2, participants explicitly rate items from a recently-developed LWA measure as valid measurements of authoritarianism. Studies 3-11 show that persons who score high on this same LWA scale possess the traits associated with models of authoritarianism (while controlling for political ideology): LWA is positively related to threat sensitivity across multiple areas, including general ecological threats (Study 3), COVID disease threat (Study 4), Belief in a Dangerous World (Study 5), and Trump threat (Study 6). Further, controlling for ideology, high-LWA persons show more support for restrictive political correctness norms (Study 7), rate African-Americans and Jews more negatively (Studies 8-9), and show more domain-specific dogmatism and attitude strength (Study 10). Study 11 reveals that the majority of the effects from Studies 3-10 hold when looking only within liberals, thus revealing these effects are about liberal authoritarianism. Study 12 uses the World Values Survey to provide evidence of Left-Wing Authoritarianism around the globe. Taken in total, this large array of triangulating evidence from 12 studies comprised of over 8,000 participants from the U.S. and over 66,000 participants world-wide strongly suggests that left-wing authoritarianism is much closer to a reality than a myth.



Traditional (print and audiovisual) media, including popular outlets, continue to be the major contributors to people’s knowledge about current affairs and that social media hardly contribute at all

What do people learn from following the news? A diary study on the influence of media use on knowledge of current news stories. Kathleen Beckers et al. European Journal of Communication, December 16, 2020. https://doi.org/10.1177/0267323120978724

Abstract: One of the main functions of news media in democracies is informing the citizenry on day-to-day affairs. However, the way in which citizens gather news has changed as nowadays people have more opportunities than ever before to adapt their media consumption based on their preferences. One of the major game changers was the introduction of social media. This raises the question to what extent traditional media still contribute to people’s knowledge of current affairs. Using a time-diary study in the Flemish media context, we investigate the influence of different forms of news consumption on current news knowledge. We conclude that traditional (print and audiovisual) media, including popular outlets, continue to be the major contributors to people’s knowledge about current affairs and that social media hardly contribute at all.

Keywords: Current affairs knowledge, media consumption, news, time diary


Less youth crime not related to changes in attachment/commitment to school, community involvement, or parental supervision, but to a decrease in unstructured socializing & alcohol consumption, & less preference for risky activities

The contemporary transformation of american youth: An analysis of change in the prevalence of delinquency, 1991–2015. Eric P. Baumer  Kelsey Cundiff  Liying Luo. Criminology, December 16 2020. https://doi.org/10.1111/1745-9125.12264

Abstract: Youth involvement in crime has declined substantially over the past few decades, yet the reasons for this trend remain unclear. We advance the literature by examining the role of several potentially important shifts in individual attitudes and behaviors that may help to account for the observed temporal variation in youth delinquency. Our multilevel analysis of repeated cross‐sectional data from eighth and tenth grade students in the Monitoring the Future (MTF) study indicates that changes in youth offending prevalence were not associated with changes in youth attachment and commitment to school, community involvement, or parental supervision after school. In contrast, the study provides suggestive evidence that the significant reduction in youth offending prevalence observed since the early 1990s was significantly associated with a decrease in unstructured socializing and alcohol consumption and, to a lesser extent, with a decrease in youth preferences for risky activities. Implications for existing theoretical explanations and future research on youth crime trends are discussed.


Risk Taking for Potential Losses (but Not Gains) Increases with Time of Day

Bedder, Rachel, Matilde M. Vaghi, Raymond J. Dolan, and Robb Rutledge. 2020. “Risk Taking for Potential Losses but Not Gains Increases with Time of Day.” PsyArXiv. December 17. doi:10.31234/osf.io/3qdnx

Abstract: Humans exhibit distinct risk preferences when facing choices involving potential gains and losses. These preferences are subject to neuromodulatory influence, particularly from dopamine and serotonin. As these neuromodulators manifest distinct circadian rhythms, this suggests decision making under risk might be affected by time of day. Here, in a large subject sample (N = 26,899), we tested the hypothesis of a diurnal modulation in risk taking for gains and losses. We found that risky options with potential losses were increasingly chosen over the course of the day, but observed no such change for how often risky options with only potential gains were chosen. Using a computational modelling approach to obtain a more fine-grained account, we show this diurnal change in risk preference reflects a decrease in sensitivity to increasing losses, but no change in the relative impacts of gains and losses on choice. This diurnal sensitivity, present across two different task designs, was robust to between- and within-subject analysis, to country (i.e., UK and US samples), age, and gender. Thus, our findings reveal a striking diurnal modulation in human decision making, a pattern with potential importance for real-life preferences that include voting, medical decision making, and global stock market investments.


Friday, December 18, 2020

Heritability of sedentary behavior: Genetic factors explained 56% of the individual differences in objective sedentary behavior & 26% of the individual differences in self‐reported sedentary behavior

Heritability of objectively assessed and self‐reported sedentary behavior. Nienke M. Schutte  Charlotte Huppertz  Stieneke Doornweerd  Meike Bartels  Eco J.C. de Geus  Hidde P. van der Ploeg. Scandinavian Journal of Medicine & Science in Sports, March 18 2020. https://doi.org/10.1111/sms.13658

Abstract: Understanding the sources of the large individual differences in sedentary behavior is of great importance as this behavior is associated with pre‐mature mortality and non‐communicable diseases. Here, we report on the contribution of genetic and environmental factors to the variation in objectively assessed (accelerometer) sedentary behavior and self‐reported sitting and their shared genetic basis. In addition, the overlap of the genetic risk factors influencing sedentary time and moderate‐to‐vigorous physical activity (MVPA) was estimated. A sample of 800 individuals (twins and their siblings) was equipped with an Actigraph accelerometer for 7 days and reported on their sitting time and time spent on MVPA on those days using the IPAQ‐SF. Genetic factors explained 56% (CI: 44%, 65%) of the individual differences in objective sedentary behavior (Actigraph) and 26% (CI: 0%, 51%) of the individual differences in self‐reported sedentary behavior (IPAQ‐SF). A modest correlation (0.33) was found between these measures, which was for 45% accounted for by genetic influences. The genetic correlation was 0.49 reflecting a partly overlapping set of genes that influenced both measurements. A modest correlation (−0.27) between Actigraph‐derived sedentary time and MVPA was found, which was 13% accounted for by genetic effects. The genetic correlation was −0.31, indicating that there are overlapping genetic variants that increase sedentary time and decrease MVPA or vice versa. To conclude, more than half of the individual differences in objective sedentary time could be attributed to genetic differences, while for self‐reported sitting this was much lower. In addition, using objective measurements, this study confirms that sedentary time is not simply the inverse of MVPA. Future studies are needed to understand the pathways translating genomic variation into variation in these behaviors and how this knowledge might feed into the development of health promotion interventions.


4 DISCUSSION

The main aim of the current study was to extend the scarce literature on the heritability of objective sedentary behavior. A relatively large sample of adult male and female twins and their siblings was equipped with an Actigraph for 7 consecutive days and reported on their sitting time and time spent on MPVA activities. We showed that more than half of the individual differences in objectively measured sedentary time could be attributed to genetic differences (56%). This estimate is comparable to the previously reported estimate of 47% for sedentary time measured objectively using a combined heart rate and movement sensor in an older, mostly female population.15

The heritability estimate for self‐reported sitting time in Dutch adults was much lower (26%) than that for the objective measure, but in good keeping with the heritability of 35% for total self‐reported sitting time in a cohort of older (aged 53‐67) Finnish adults.11 The lower heritability of self‐reported sitting time might in part be explained by recall bias, social desirability bias, or other measurement bias, which in the model are part of the unique environmental component (E), thereby inflating the influence of E. The unstandardized environmental variance in self‐reported sitting time was indeed higher compared with the environmental variance component of objective sedentary time. Another explanation for the lower heritability of our self‐report measure compared with objectively measured sedentary time is that the IPAQ‐questionnaire assesses only sitting time, while objectively measured sedentary time will also include time lying down (daytime napping) and standing still.

A few attempts have been made to identify the genetic variants underlying the heritability of self‐reported sedentary behaviors. In the QuĆ©bec Family Study, a variant of the melanocortin‐4 receptor (MC4R) gene was found to be associated with a combined measure of self‐reported sedentary time and physical inactivity28 and in the Framingham Heart study an association of the fat mass and obesity‐associated (FTO) gene with sitting time was reported.29 These candidate gene studies are now understood to have been underpowered and confirmation through meta‐analysis of genome‐wide association (GWA) studies in very large samples from multiple cohorts are direly needed.21 A GWA study using accelerometer data of ~100 000 participants from the UK Biobank cohort reported 4 loci for sedentary time (rs26579 near MEF2C‐AS2, rs25981 near EFNA5, rs1858242 near LOC105377146; and rs34858520 near CALN1).30

If self‐reported sitting time and objectively measured sedentary time could be safely mixed in meta‐analyses it would become easier to accrue the sample sizes needed to identify the many genetic variants that may play a role in this complex and likely polygenetic behavioral trait. This requires a significant overlap in the genetic variants that influence self‐reported and objectively measured sedentary time. Our results are mildly encouraging for such future endeavors. Previous studies had shown mixed results when comparing accelerometer‐based sedentary time to survey derived sedentary time ranging from poor to reasonably strong agreement.3132 At the phenotypic level, we find a significant but modest correlation of r = 0.33 which fits this pattern of results. However, a bivariate genetic decomposition of the phenotypic correlation showed that the genetic variants that are associated with self‐reported sitting are also associated with objectively measured sedentary behavior. Although the phenotypic correlation is modest only, the genetic correlation (rG = 0.49) might support meta‐analysis across both types of measures in genome‐wide gene‐finding studies; at least a part of the genetic variants relevant to sedentary behavior will be associated with both measures.

Recently, the Sedentary Behavior Research Network (SBRN; a network connecting sedentary behavior researchers and health professionals from around the world) updated its definitions on, among others, sedentary behavior and physical inactivity and thereby supported that an insufficient physical activity level is not the same as sedentary behavior.1 This idea is supported by the modest inverse correlations detected between objective sedentary time and MVPA in this study, matching those observed in earlier studies.16-18 This confirms that sedentary time is not simply the inverse of MVPA. Interestingly, the observed association between occupational sedentary time and occupational MVPA is −0.29, whereas the association between non‐occupational sedentary time and non‐occupational MVPA increases to −0.42, suggesting that outside work time, the association between MVPA and sedentary time is stronger. As a large portion of this is leisure time, it might be that when given the free choice, people who do more physical activity, also sit less.

When dividing total accelerometer wear time into occupational and non‐occupational time, the heritability estimate of occupational sedentary time (45%) is higher than the heritability estimate for non‐occupational sedentary time (28%). This was unexpected as sitting time at work was considered to be more under external environmental rather than under the internal control of behavioral disposition. However, sitting time is known to be strongly associated with type of work with white‐collars generally accumulating higher levels of sedentary behavior than blue collars.33 The type of work will be strongly dependent on educational attainment which has shown to be a heritable trait.34 Possibly, the genetic factors that are associated with educational attainment or other traits that co‐determine the employment setting might contribute to the variation in occupational sedentary time.

The heritability of objectively measured MVPA was 46%. This heritability is comparable to the previously reported estimates of 47% for objective MVPA, based on a combined heart rate and movement sensor15 and estimates of 55% and of 47% for MPA and VPA measured with an accelerometer.35 Self‐reported MVPA from the IPAQ showed a low heritability estimate (14%) and this echoes reports of low heritability of self‐reported MVPA in other adult samples.3637 Not surprisingly, we detected only a small correlation of r = 0.11 between objective and self‐reported MVPA. The latter may suffer from a larger measurement error because it includes a broad range of commuting, work, and household activities for which both intensity and duration may be hard to recall. Lee et al (2011) conducted a systematic review of the validity of the IPAQ‐SF and displayed that correlations between VPA/MPA/walking and objective standards showed great variability, ranging from −0.18 to 0.76.38 When self‐report is limited to voluntary leisure time activities of moderate‐to‐vigorous intensity, recall seems to be better. Regular exercise behavior, which is arguably easier to recall than all daily MVPA due to the mostly organized nature of exercise, has shown to be heritable in many adult twin and family samples with estimates higher than 40%.3940

Some limitations of this study must be noted. The twin sample used in the current study was relatively highly educated and 75% of the sample were female, which limits generalizability to the general population. This could have reduced the variance in our sample, and therefore have influenced our estimates. In addition, because of the small number of male participants we were unable to stratify our analyses by gender. Finally, as some people nowadays have flexible working hours (working part time or from home), it might be difficult to indicate their workday start and finishing times in the diary we used. Estimates of the genetic contribution to the (co)variance in occupational and non‐occupational sedentary time and MVPA might increase when a stricter distinction between working hours and non‐working hours is achieved as measurement error is reduced.

5 PERSPECTIVE

The majority of the variance in objectively measured sedentary time in a large sample of Dutch twins and their siblings could be explained by genetic factors. As opposed to general beliefs regarding the heritability of health behaviors, high heritability estimates do not signal that interventions are wasted efforts. Interventions on behavioral traits which are proven to be hereditary can have a large mean effect. Biological influences on the trait might explain the variation or individual differences in effect. The key is to identify the individuals who benefit the most from the intervention and exploit these biological influences on sedentary behavior in personalized or stratified interventions. Heritability studies serve to remind us that there is a biological component to individual differences in behavior. Sedentary time is not an exception. Interventions ignoring this underlying biology may prove less effective than those that build on furthering our understanding of the pathways from the genomic level to health behaviors.

Although surgeons & laypeople generally fail to recognize cosmetic surgery benefits beyond mere aesthetics, men & women bragging about cosmetic surgeries are deemed as higher in status; women gain in attractiveness

Folwarczny, Michal, and Tobias Otterbring. 2020. “Cosmetic Surgeries as Conspicuous Consumption: Disclosing Information About Having Undergone Cosmetic Surgery Signals Social Status.” PsyArXiv. December 17. doi:10.31234/osf.io/n4p37

Abstract: Do patients incur cosmetic surgery risks solely for aesthetic reasons, or do they draw additional, status-related benefits? Like other species, humans strive to attain high status in hierarchies as it helps them solve challenges linked to survival and reproduction. Cosmetic surgeries are costly, both bodily and financially. Organisms employ such seemingly self-handicapping actions to signal status. Across a series of studies (N = 1276) on UK and US samples, we demonstrate that although surgeons and laypeople generally fail to recognize cosmetic surgery benefits beyond mere aesthetics, men and women bragging about cosmetic surgeries are deemed as higher in status. Moreover, for women—but not men—status inferences are partially driven by attractiveness perceptions, consistent with an evolutionary account. However, contrary to what evolutionary theories predict, both sexes are keener on cosmetic surgeries after evaluating attractive opposite-sex models. Thus, people may "use the knife" to signal status, especially when mating motives are salient.


Helpers anticipated less appreciation for partial help than help-seekers felt in receiving it

Halfway to My Request Is Not Halfway to My Heart: Underestimating Appreciation for Partial Help. Yilu Wang, Xiaofei Xie. Personality and Social Psychology Bulletin, December 17, 2020. https://doi.org/10.1177/0146167220975276

Abstract: When being asked for help, people sometimes can only offer part of what is requested (i.e., partial help). The present research investigates whether helpers can accurately forecast how much help-seekers appreciate this understudied form of assistance. From multiple helping scenarios and a face-to-face interaction, we demonstrate an asymmetry in helpers’ and help-seeker’s appraisals of partial help: Helpers anticipated less appreciation for partial help than help-seekers felt in receiving it. This asymmetry arose from helpers’ greater valuation of helping outcomes over intentions to be helpful than help-seekers’. Accordingly, when helpers’ intentions were discounted, this asymmetry no longer persisted. Another account—helpers feel worse for breaking norms of helping than help-seekers—was not supported. We discuss several directions for future research on the psychology of partial prosocial behaviors.

Keywords: helping, help-seeking, social prediction, prosocial behavior


Early blindness does not critically impact on the development of the “social brain,” with social tasks performed on the basis of auditory or tactile information driving consistent node activations like those of the sighted

Social cognition in the blind brain: A coordinate‐based meta‐analysis. Maria Arioli  Emiliano Ricciardi  Zaira Cattaneo. Human Brain Mapping, December 15 2020. https://doi.org/10.1002/hbm.25289

Abstract: Social cognition skills are typically acquired on the basis of visual information (e.g., the observation of gaze, facial expressions, gestures). In light of this, a critical issue is whether and how the lack of visual experience affects neurocognitive mechanisms underlying social skills. This issue has been largely neglected in the literature on blindness, despite difficulties in social interactions may be particular salient in the life of blind individuals (especially children). Here we provide a meta‐analysis of neuroimaging studies reporting brain activations associated to the representation of self and others' in early blind individuals and in sighted controls. Our results indicate that early blindness does not critically impact on the development of the “social brain,” with social tasks performed on the basis of auditory or tactile information driving consistent activations in nodes of the action observation network, typically active during actual observation of others in sighted individuals. Interestingly though, activations along this network appeared more left‐lateralized in the blind than in sighted participants. These results may have important implications for the development of specific training programs to improve social skills in blind children and young adults.

4 DISCUSSION

The study of the neural bases of social cognition in the blind brain has been somehow neglected, with only a few studies specifically investigating whether and how the lack of visual input affects the functional architecture of the “social brain.” Some studies showed similar patterns of brain activity in early blind and sighted individuals during tasks tapping on social cognition abilities (Bedny et al., 2009; Ricciardi et al., 2009), while other studies suggested that social brain networks develop differently following early visual deprivation (Gougoux et al., 2009; Holig et al., 2014). These inconsistencies reported in the neuroimaging literature on social processing in blind individuals may also reflect possible confounds associated with individual studies, for example, the influence of experimental and analytic procedures as well as that of the small sample sizes (Carp, 2012). Moreover, the effects reported by individual studies are harder to generalize to the entire target group (here, the early blind), regardless the specific procedures used (Muller et al., 2018).

In light of this, we pursued a meta‐analytic approach to isolate the most consistent results in the available literature, controlling for possible confounding effects via stringent criteria for study selection. In particular, we aimed to investigate: (a) the neural coding of others' representation in early blind individuals, and (b) the specific brain regions recruited in early blind compared with sighted control individuals, during social processing of others. Although we could count only on a low number of contrasts, preventing more detailed analyses such as a direct comparison of nodes of the social brain possibly differently engaged by auditory and haptic inputs, our sample is in line with current recommendations for ALE meta‐analyses (Eickhoff et al., 2016; Muller et al., 2018).

Our findings demonstrate that the regions typically associated with the key nodes of the AON mediate social cognition abilities in early blind individuals on the basis of non‐visual inputs, as they do during actual observation of others in sighted individuals (Gardner et al., 2015). In particular, we found consistent overlapping activations in the middle temporal gyrus bilaterally, alongside the left fusiform gyrus and the right superior temporal gyrus and finally in the right inferior frontal gyrus of early blind individuals during others' processing. The bilateral activation of the middle temporal gyrus has been previously reported for the AON in a quantitative meta‐analysis on more than 100 studies in sighted individuals (Caspers et al., 2010). Moreover, similar results, including right frontal activation, are reported in a meta‐analysis investigating brain regions showing mirror properties through visual and auditory modalities in sighted individuals (Molenberghs, Cunnington, & Mattingley, 2012).

Of note, we found stronger consistent responses in the AON in the early blind as compared to sighted subjects. This is not surprising, since the studies we included in the meta‐analysis mostly employed auditory inputs (~90% of the studies, only two studies using haptic stimuli) that are the typical stimuli on which blind individuals rely on in social interactions, whereas sighted individuals are mainly guided by visual cues. This may also account for the different pattern of lateralization observed in the activation of the AON in blind and sighted individuals, with the former showing more consistent activations in the left hemisphere particularly in the middle temporal gyrus and fusiform gyrus, while the reverse comparison highlighted the activation of the right part of the middle and superior temporal cortex. The different pattern of hemispheric lateralization may depend on the high familiarity that blind individuals have in recognizing human actions or emotions on the basis of auditory (and haptic) stimuli, with prior evidence suggesting that action familiarity is associated with increasing activity in left part of the AON (Gardner et al., 2015; Ricciardi et al., 2009).

An additional analysis carried out on the whole sample of participants (regardless visual experience) confirmed the common activation in a right temporal cluster, comprising the STG, the TPJ and the MTG regions. This cluster appears to be consistently engaged in both groups during social processing and activations in these regions are likely to play a more general function in the perception of socially relevant stimuli, which is not bound to visual experience (Fairhall et al., 2017). These results fit with the involvement of the right STG and TPJ in a variety of social‐cognitive processes (Bahnemann, Dziobek, Prehn, Wolf, & Heekeren, 2010; Yang, Rosenblau, Keifer, & Pelphrey, 2015), such as biological motion perception (Beauchamp, Lee, Haxby, & Martin, 2003; Grossman et al., 2000; Peelen, Wiggett, & Downing, 2006), mentalizing (Schneider, Slaughter, Becker, & Dux, 2014; Wolf, Dziobek, & Heekeren, 2010), and emotion attribution to others on the basis of both visual and auditory/verbal information (e.g., Alba‐Ferrara, Ellison, & Mitchell, 2012; Ferrari, Schiavi, & Cattaneo, 2018; Gamond & Cattaneo, 2016; Lettieri et al., 2019; Redcay, Velnoskey, & Rowe, 2016; Sliwinska & Pitcher, 2018). These data suggest a two‐stage process in which the STS underpins an initial parsing of a stream of information, whether auditory or visual, into meaningful discrete elements, whose communicative meaning for decoding others' behavior and intentions involves more in‐depth analysis associated with increased activation in the TPJ node (Arioli & Canessa, 2019; Bahnemann et al., 2010; Redcay, 2008). Ethofer et al. (2006) showed that the pSTS is the input of the prosody processing system and represents the input to higher‐level social cognitive computations, associated with activity in the action observation system (Gardner et al., 2015), as well as in the mentalizing system (Schurz, Radua, Aichhorn, Richlan, & Perner, 2014). Accordingly, using visual stimuli Arioli et al. (2018) pointed to the pSTS as the input for the social interaction network, which includes key nodes of both action observation and theory of mind networks. Thus, the STS/TPJ regions may represent a domain‐specific hub associated with the analysis of the meaning of others' actions, regardless of the stimulation modality, and highly interconnected with the action observation and the mentalizing networks.

The lack of activation of the parietal cortex in the early blind, with the parietal cortex being another key node of the AON in sighted individuals, is possibly due to the low number of studies specifically focused on hand representation in our database (see Pellijeff, Bonilha, Morgan, McKenzie, & Jackson, 2006; 3/17, see Table 1). Indeed, Caspers et al. (2010) reported that only observation of hand actions was consistently associated with activations within parietal cortex, the observation of non‐hand actions was not. Moreover, although Ricciardi et al. (2009) reported a parietal activation in blind participants during auditory presentation of hand‐executed actions, this activation was much less extensive (particularly in the superior parietal cortex) in the blind compared to sighted controls. Another possible explanation for the lack of parietal activation in the blind in our meta‐analysis (also possibly accounting for the results by Ricciardi et al., 2009) is that the activation within the parietal part of the AON may be mainly driven by object‐related representations (Caspers et al., 2010), which are not present in several of the experiments included in the present analysis. In turn, our studies focused mainly on voice processing (6/17), and in part on face/body representation (4/17), this probably being responsible for the consistent activation we reported in the fusiform gyrus. Indeed, voice processing has been found to activate the fusiform face area in blind individuals (i.e., Fairhall et al., 2017).

The findings of this meta‐analysis suggest that the AON can develop despite the lack of any visual experience, with information acquired in other sensory modalities allowing an efficient representation of other individuals as agents with specific beliefs and intentions (vs. objects moved by physical forces). These results may explain why early blind individuals are able to efficiently interact in the social context and to learn by imitation of others' (e.g., Gamond et al., 2017; Oleszkiewicz et al., 2017; Ricciardi et al., 2009). Our findings suggest that regions of the social brain may work on the basis of different sensory inputs, depending on which sensory modality is available. Moreover, our findings are consistent with the results of a recent meta‐analysis by Zhang et al. (2019) and with prior fMRI studies with blind individuals in the social domain (e.g., Bedny et al., 2009; Ricciardi et al., 2009) suggesting that brain regions that are consistently recruited for different functions in sighted individuals, such as the dorsal fronto‐parietal network for spatial function and ventral occipito‐temporal network for object function, and—as shown here—the AON for social function, maintain their specialization despite the lack of a normal visual experience. This observation on the “social blind brain” is in line with the current, more general perspective on the blind brain that undergoes a functional reorganization due to the lack of visual experience, but whose large‐scale architecture appears to be significantly preserved (e.g., Ricciardi, Papale, Cecchetti, & Pietrini, 2020).

Interestingly, we did not find evidence for any cross‐modal consistent recruitment of the occipital cortex by social tasks in this meta‐analysis. Cross‐modal plasticity typically refers to activation of the occipital cortex of the early blind in response to input acquired in other sensory modalities, like hearing and touch (for reviews, Merabet & Pascual‐Leone, 2010; Singh, Phillips, Merabet, & Sinha, 2018; Voss, 2019), and may account (at least in part) for the superior perceptual abilities of blind subjects in the spared sensory modalities (e.g., Battal, Occelli, Bertonati, Falagiarda, & Collignon, 2020; Bauer et al., 2015). Alternatively, recruitment of the occipital cortex in the blind has been proposed to also subserve high‐level (cognitive) processing (e.g., Amedi, Raz, Pianka, Malach, & Zohary, 2003; Bedny, Pascual‐Leone, Dodell‐Feder, Fedorenko, & Saxe, 2011; Lane, Kanjlia, Omaki, & Bedny, 2015) suggesting that cortical circuits that are thought to have evolved for visual perception may come to participate in abstract and symbolic higher‐cognitive functions (see Bedny, 2017). Indeed, recent evidence has shown that during high‐level cognitive tasks (i.e., memory, language and executive control tasks), there is an increased connectivity between occipital cortex and associative cortex in the lateral prefrontal, superior parietal, and mid‐temporal areas (Abboud & Cohen, 2019), with these regions being also possibly involved in social perception (Caspers et al., 2010). In line with this, we would have expected social tasks to drive activations in the occipital cortex. This was not the case. The only region that showed a sort of cross‐modal response was the fusiform face area, in the ventral stream, probably guided by a high number of studies included in our meta‐analysis focusing on voice processing (cf. Holig et al., 2014; von Kriegstein, Kleinschmidt, Sterzer, & Giraud, 2005). In this regard, it is also worth noting that haptic perception by blind individuals of facial expressions and hand shapes (Kitada et al., 20132014) as well as whole‐body shape recognition via a visual‐to‐auditory sensory substitution device (SSD; Striem‐Amit & Amedi, 2014) led to activations in face and body‐dedicated circuits in the fusiform gyrus, showing that these dedicated circuits develop even in the absence of a normal visual experience. Our meta‐analysis shows that processes related to representation of others do not recruit the occipital cortex in the early blind, suggesting that differently to other cognitive tasks, social tasks may be mediated by higher‐level regions without the need to recruit additional occipital resources. Even if this might be related to the experimental heterogeneities that we highlighted above, the lack of a consistent recruitment of occipital cortex for social tasks we reported contributes to a better understanding of the functional role of “visual” areas in the blind brain.

In conclusion, our findings support the view that the brain of early blind individuals is functionally organized in the same way of the brain of sighted individuals although relying on different types of input (auditory and haptic) (see Bedny et al., 2009; Ricciardi et al., 2009). In the social domain, this may have important implications for educational programs for blind children. Early blindness may indeed predispose to features of social isolation, including autism (e.g., Hobson et al., 1999; Jure, Pogonza, & Rapin, 2016). It is therefore important to develop training administration guidelines specifically for persons with visual impairment (Hill‐Briggs, Dial, Morere, & Joyce, 2007). In this regard, an interesting approach would be to develop ad hoc auditory/haptic virtual reality social cognition trainings for children with blindness or severe visual impairment, as already employed with autistic children and young adults (e.g., Didehbani, Allen, Kandalaft, Krawczyk, & Chapman, 2016; Kandalaft, Didehbani, Krawczyk, Allen, & Chapman, 2013). Consistent evidence suggests that audio‐based virtual environments may be effective for the transfer of navigation skills in the blind (Connors, Chrastil, Sanchez, & Merabet, 2014; Sanchez & Lumbreras, 1999), and haptic virtual perception may be a valid and effective assistive technology for the education of blind children in domains like math learning (e.g., Espinosa‐Castaneda & Medellin‐Castillo, 2020). This approach—especially audio‐based virtual environments—may thus be extended to the social domain to allow the safe and non‐threatening practice of particular social skills in an educational setting. In this respect, and considering the importance for visually impaired children to study in a mainstream school (e.g., Davis & Hopwood, 2007; Parvin, 2015), school‐based social cognitive interventions on the social participation of children with blindness or severe visual impairment would be particularly critical, with teachers and peers being involved responding and reinforcing blind children' initiated interactions. A detailed description of the neuro‐cognitive processes underlying social cognition skills in blind individuals is thus critical to tailor training protocols aiming at targeting specific neuro‐cognitive functions. This may have also a translational clinical impact on the development of non‐invasive advanced SSDs able to translate social cues that are only visually available (such as face expressions, gestures and body language) to auditory or tactile feedback that can be processed by the intact social brain of visually deprived individuals, in terms of more abstract conceptual signals (see Cecchetti, Kupers, Ptito, Pietrini, & Ricciardi, 2016; Striem‐Amit & Amedi, 2014). These devices may help blind individuals in their interactions both in the physical and virtual (i.e., meetings via Skype, Meet or others) social world.