Participants’ intention to vote for male candidates increased with age until candidates were about 45 years old and then slightly decreased. In contrast, participants’ intention to vote for female candidates consistently decreased with candidates’ age

How Candidates’ Age and Gender Predict Voter Preference in a Hypothetical Election. Yiqin Alicia Shen, Yuichi Shoda. Psychological Science, May 21, 2021. https://doi.org/10.1177/0956797620977518

Abstract: Are preferences for political candidates influenced by how old they appear to be? Amazon Mechanical Turk workers and undergraduate students were shown photos of 93 state legislators as candidates in hypothetical elections. Other information about the candidates (e.g., party affiliation) was held constant, randomized, or not presented. For very young candidates (< 35 years old), participants favored women over men. However, participants’ intention to vote for male candidates increased with age until candidates were about 45 years old and then slightly decreased. In contrast, participants’ intention to vote for female candidates consistently decreased with candidates’ age. Perceived attractiveness and warmth accounted for some of the gender differences in the effect of candidates’ perceived age.

Keywords: age, gender, voting, preregistered

The alcohol harm paradox: The hoi polloi suffer from higher rates of alcohol-related harm compared with advantaged groups, despite reporting similar or lower levels of consumption on average

Causal mechanisms proposed for the alcohol harm paradox—a systematic review. Jennifer Boyd, Olivia Sexton, Colin Angus, Petra Meier, Robin C. Purshouse, John Holmes. Addiction, May 17 2021. https://doi.org/10.1111/add.15567

Abstract

Background and Aims: The alcohol harm paradox (AHP) posits that disadvantaged groups suffer from higher rates of alcohol-related harm compared with advantaged groups, despite reporting similar or lower levels of consumption on average. The causes of this relationship remain unclear. This study aimed to identify explanations proposed for the AHP. Secondary aims were to review the existing evidence for those explanations and investigate whether authors linked explanations to one another.

Methods: This was a systematic review. We searched MEDLINE (1946–January 2021), EMBASE (1974–January 2021) and PsycINFO (1967–January 2021), supplemented with manual searching of grey literature. Included papers either explored the causes of the AHP or investigated the relationship between alcohol consumption, alcohol-related harm and socio-economic position. Papers were set in Organization for Economic Cooperation and Development high-income countries. Explanations extracted for analysis could be evidenced in the empirical results or suggested by researchers in their narrative. Inductive thematic analysis was applied to group explanations.

Results: Seventy-nine papers met the inclusion criteria and initial coding revealed that these papers contained 41 distinct explanations for the AHP. Following inductive thematic analysis, these explanations were grouped into 16 themes within six broad domains: individual, life-style, contextual, disadvantage, upstream and artefactual. Explanations related to risk behaviours, which fitted within the life-style domain, were the most frequently proposed (n = 51) and analysed (n = 21).

Conclusions: While there are many potential explanations for the alcohol harm paradox, most research focuses on risk behaviours while other explanations lack empirical testing.

Discussion

This review examined explanations for the AHP to identify potential pathways and mechanisms which result in differential risk of harm between SEP groups. This is a new approach, and goes beyond previous systematic reviews and meta-analyses which have so far established the existence of the AHP and the contribution of alcohol to this relationship [3, 18]. We identified 16 themes within six domains used to explain the AHP. Risk behaviours were the most prevalent explanations. This finding, paired with the dominance of the behavioural paradigm in empirical work, suggests that there has been a reliance upon using risk behaviour to understand the AHP. Evidence found in this review opposed the idea that the AHP was an artefact. There were many other, mainly hypothetical, explanations for the AHP proposed in the literature. This included individual-level mechanisms (e.g. biological or psychological), contextual factors (e.g. place-based factors), the lived experience of disadvantage and upstream structural factors (e.g. the economy and politics). In part, this reflects an awareness that the AHP is complex; there is no simple explanation, and researchers do not view causes in isolation. However, it remains unclear why other re-occurring explanations (e.g. social support or access to health care) have been neglected, while researchers frequently return to risk behaviours. This is particularly puzzling, given that quantitative evidence suggests that risk behaviours only play a partial role [4, 47].

There are two potential reasons for this: theoretical and methodological. Study of the AHP is rooted in alcohol epidemiology, which singularly focuses upon the causes and effects of alcohol consumption [65]. More broadly, the field of epidemiology has faced criticism regarding its approach to understand population health. One of the earliest critiques by Krieger points to fundamental errors in developing epidemiological methods rather than theory, with greater weight given to proximal risk factors and a focus upon causes without context [66]. These limitations have led to an emphasis upon individual disease susceptibility and individual-level interventions. Instead, Krieger argues that the eco-social perspective (the idea that biology and biological changes are shaped by the social environment) should be used to understand health [66]. Concerns regarding how causation is viewed in epidemiology have persisted in contemporary public health, with similar criticisms raised more recently [67]. These concerns continue, despite efforts to raise the profile of theories such as the eco-social perspective and calls to adopt pluralist approaches to causality in epidemiology, which stipulate that causation is not a single connection between two things, but the context in which a causal relationship is observed plays a role [67]. Adopting such an approach would change the way alcohol researchers conceptualize and investigate the AHP.

The lack of clear theoretical structuring in epidemiology, which is argued to have led to a focus upon proximal risk factors (e.g. risk behaviours), could also be a symptom of a lack of methods to carry out more complex analyses of distal factors. Possible solutions to this include the use of complex system modelling methods, which have gained traction within public health and are now being implemented in a UK-based project to gain insight into the causal relationships between policy and health-related outcomes [68]. Software architecture has also recently been devised to address how theory can be systematically incorporated into individual-level and agent-based computer simulations to understand health and health behaviours [69]. Applying these computer simulation methods to the AHP could provide the opportunity to shift the empirical focus from risk behaviours to wider determinants, as they can capture complexity and are mechanism-based rather than focused upon testing relationships between variables.

Strengths and limitations

This is the first review, to our knowledge, to catalogue explanations provided for the AHP across a breadth of literature. In taking a broad approach to literature searching and inclusion criteria it was possible to review work from multiple disciplines employing varied methodologies. This led to the identification of a varied set of explanations. However, it is possible that some explanations are more appropriate, depending upon the study design, population and measure of harm. As the primary aim of this review was to collate and review explanations more generally, we did not conduct an in-depth exploration of this issue. However, upon examination there was no evidence that study design or population influenced which explanations were presented. In terms of measures, we found one clear example of an explanation only applicable when using a subjective measure of alcohol harm—those in low SEP groups who drink may feel their outcomes are worse because their peers are more likely to be abstainers [8]. This issue awaits further examination.

This review was restricted to high-income countries. The results and conclusions are therefore only applicable to this context. Furthermore, most papers focused upon the United Kingdom, which may limit generalizability. This was justified, given substantial differences in alcohol environments. However, given that alcohol is a global issue [1], future research should gain insight into how alcohol affects the disadvantaged in low–middle-income countries to help address the deepening of local and global health inequalities.

Another limitation is that only one reviewer screened and extracted data from the papers. We recruited an independent researcher to re-assess a sample of papers for inclusion and extraction. Cross-checking between the two reviewers demonstrated good reliability.

Research and policy implications

The lack of explicit theory used to present explanations is a barrier to understanding the causes of the AHP. The development or application of theory may be fundamental to identify the true causal mechanisms which create and sustain the AHP. Several explanations have been proposed which align with the vast literature detailing theories of health inequality more generally. The eco-social perspective, among those more commonly discussed [e.g. the materialist (the link between wealth and resources and health) or political economy perspective (the idea that risk factors for health inequalities are rooted in structures)] [70], are just some examples of health inequality theory which could be applied to understand the AHP.

The AHP is well-evidenced, and behavioural-related explanations play a partial role. However, these explanations fall short in understanding the complex causes of inequalities in alcohol-related harm. There is a current lack of evidence investigating other explanations found in this review, which makes it difficult to suggest potential interventions to mitigate the AHP. Future research should empirically investigate these alternative explanations for the AHP. Computer simulations models offer one potential way of achieving this aim in the short term and for relatively low cost.

Based on the evidence from this review, the key policy implication is that tackling drinking alone will not reduce inequalities in alcohol-related harm. While there is some evidence that improving multiple health behaviours may attenuate the risk of alcohol-related harm, it is critical that policymakers look to policies outside the scope of public health to mitigate the inequality produced by the paradox.

San Francisco’s flavor ban was associated with more than doubled odds of recent smoking among underage high school students relative to concurrent changes in other districts

A Difference-in-Differences Analysis of Youth Smoking and a Ban on Sales of Flavored Tobacco Products in San Francisco, California Abigail S. Friedman. JAMA Pediatr., May 24, 2021. https://jamanetwork.com/journals/jamapediatrics/fullarticle/2780248

Restrictions on flavored tobacco product sales are increasingly popular; 5 US states and hundreds of localities have implemented them in the past few years alone. Yet only 1 study,1 to my knowledge, has considered how complete flavor bans applying to electronic nicotine delivery systems and combustible tobacco products, without retailer exemptions, are associated with tobacco use. A convenience sample of residents of San Francisco, California, aged 18 to 34 years who had ever used a tobacco product showed significant reductions in any tobacco use following the city’s flavor ban, with a marginally significant increase in combustible cigarette use (smoking) among those aged 18 to 24 years.1 Absent a comparison group, however, it is impossible to ascertain if preexisting trends could have driven these findings.

Given the relative health costs of smoking vs vaping nicotine,2,3 flavor bans that increase smoking may prove harmful. Thus, this study’s objective was to estimate the association between San Francisco’s ban on flavored tobacco product sales and smoking among high school students younger than 18 years.

Methods

Data came from the 2011-2019 Youth Risk Behavior Surveillance System (YRBSS) biennial school district surveys, with consideration restricted to districts with representative smoking data (with response rates ≥60%) available through the US Centers for Disease Control and Prevention for each wave: New York City, New York; Broward County, Florida; Los Angeles, California; Orange County, Florida; Palm Beach County, Florida; Philadelphia, Pennsylvania; and San Diego, California, as well as San Francisco, California. This analysis focused on high school students younger than 18 years who had nonmissing data for the outcome of interest: a binary indicator for recent (ie, past 30-day) smoking. This study was deemed exempt from institutional review board review under US federal regulation 45 CFR 46.101(b)(4). The analysis used publicly available YBRSS data, a survey with collection procedures designed to maintain student anonymity; therefore, informed consent was not required.

[...]

Recent vaping was not considered because of likely confounding. California legalized recreational marijuana use the same year San Francisco’s flavor ban went into effect; in addition, the YRBSS’s vaping questions did not distinguish vaping nicotine vs marijuana.

Covariates captured age, sex, and race/ethnicity fixed effects and tobacco policies on January 1 of the survey year (specifically, state-plus-district conventional cigarette taxes and indicators for smoke-free restaurant laws). San Francisco did not implement other new tobacco control policies between the 2017 and 2019 surveys.4

[...]

Results

[...] Difference-in-differences analyses found that San Francisco’s flavor ban was associated with more than doubled odds of recent smoking among underage high school students relative to concurrent changes in other districts (adjusted odds ratio, 2.24 [95% CI, 1.42-3.53]; P = .001; Figure 2). This result was robust to adjustment for district-specific time trends (adjusted odds ratio, 2.32 [95% CI, 1.45-3.70]; P < .001) and limiting consideration to California (adjusted odds ratio, 2.01 [95% CI, 1.15-3.51]; P = .01).

Discussion

San Francisco’s ban on flavored tobacco product sales was associated with increased smoking among minor high school students relative to other school districts. While the policy applied to all tobacco products, its outcome was likely greater for youths who vaped than those who smoked due to higher rates of flavored tobacco use among those who vaped.5 This raises concerns that reducing access to flavored electronic nicotine delivery systems may motivate youths who would otherwise vape to substitute smoking. Indeed, analyses of how minimum legal sales ages for electronic nicotine delivery systems are associated with youth smoking also suggest such substitution.6

This study’s primary limitation is generalizability. Future research should assess whether estimates hold over time and in other localities and consider how policy heterogeneity (eg, retailer exemptions) modifies such bans’ outcomes.

Despite substantial changes in group composition, chimpanzees adhered for 12 years to arbitrary group-specific greetings not explained by genetics or the environment; seems that our conventions are rooted in our evolutionary history

Temporal stability of chimpanzee social culture. Edwin J. C. van Leeuwen. Royal Society Biology Letters, May 26 2021. https://doi.org/10.1098/rsbl.2021.0031

Abstract: Culture is a hallmark of the human species, both in terms of the transmission of material inventions (e.g. tool manufacturing) and the adherence to social conventions (e.g. greeting mannerisms). While material culture has been reported across the animal kingdom, indications of social culture in animals are limited. Moreover, there is a paucity of evidencing cultural stability in animals. Here, based on a large dataset spanning 12 years, I show that chimpanzees adhere to arbitrary group-specific handclasp preferences that cannot be explained by genetics or the ecological environment. Despite substantial changes in group compositions across the study period, and all chimpanzees having several behavioural variants in their repertoires, chimpanzees showed and maintained the within-group homogeneity and between-group heterogeneity that are so characteristic of the cultural phenomenon in the human species. These findings indicate that human culture, including its arbitrary social conventions and long-term stability, is rooted in our evolutionary history.

4. Discussion

For a behaviour to be labelled ‘cultural’, scholars typically evaluate the behaviour for its (i) emergence through social learning, (ii) sharedness among group members (and absence or difference for members of other groups) and (iii) longevity [14,39,40]. While a plethora of studies have documented socially learned behavioural traditions in animals [41,42], to my knowledge, there is a paucity with respect to evidencing the stability of traditions.

One established example of cultural persistence in animals concerns tool use in wild chimpanzees: over a period of 25 years, group differences with respect to tool-material selection for nut cracking remained highly similar, despite a large number of (female) migrations [43,44]. Material culture has plausibly been part of chimpanzees' repertoire for thousands of years [45], yet social culture remains to be systematically documented in animals. Recently, cultural transmission of social customs has been suggested for traditions in great apes ([9,10,46]; also see [14,47]). Moreover, social culture in terms of socially learned patterns of association and interaction that result in group-specific sociality has been implied as an explanatory mechanism for non-random social dynamics in animals (e.g. [48–54]). In these studies, some forms of stability were documented—for instance, neighbouring groups of meerkats (Suricata suricatta) differed consistently in the time of day on which they emerged from their burrows across a decade [54], and reef sharks (Carcharhinus amblyrhynchos) were found to gather in the same close association cliques annually across four consecutive years, presumably to benefit from public information regarding food patches [52]. Arguably the best-documented case of social culture in animals comes from observations on troops of wild olive baboons (Papio anubis) living in the Masai Mara Reserve of Kenya. Owing to the simultaneous deaths of a substantial number of aggressive adult males (caused by a selective outbreak of tuberculosis), the respective ‘Forest Troop’ became a group of relatively socially tolerant and non-aggressive members in comparison to another group living in the same reserve (Talek troop) and the Forest Troop pre-dating the deaths [48,53]. Despite a substantial influx of new group members, across a period of at least 10 years, the Forest Troop remained markedly characterized by what the authors called a culture of ‘pacifism’—relatively high rates of grooming and affiliation, relaxed dominance hierarchies and an overall tendency of non-aggressive interactions, even between resident females and newly immigrated males [48].

Here, I report the multiyear (12 years) stability of a variational cultural practice [24], which is plausibly devoid of any ecological relevance. Whereas material cultures [7,55], but also culturally induced social foraging [52] and dyadic interactions [48,53] are behaviours with clear adaptive value [56], the precise variant by which chimpanzees engage in the handclasp grooming does not bear any relevance to survival or fitness. As such, stability in variant preference might be even less expected given the lack of eliciting affordances in the environment (e.g. the presence of termites might (re-)trigger termite fishing). In analogy to human culture: whereas the motivation for bridging social distances gives rise to greeting behaviours universally, the exact manner in which the greeting gesture emerges (and perpetuates) is highly culture specific [57,58]. The here reported group differences are also difficult to explain based on genetics: the study groups do not systematically differ in their subspecies composition, and whereas the handclasp behaviour an sich could be hypothesized to be under positive genetic selection [59] (i.e. its function is still largely unknown), the relative style preferences by which the groups choose to handclasp seem harder to place in such a selectionist framework (also see [11,24]). The finding that female dyads engaged more in palm clasping while male dyads engaged more in wrist clasping could be due to the fact that chimpanzee males may use the handclasp as a means to confirm or assert dominance over the partner. The subject's wrist position allows the partner to support the weight of the subject's clasping arm, which can be viewed as a prosocial act by the partner [11]. Albeit plausible, more research is needed to investigate this conjecture, including how such configurations are initiated.

Between-group heterogeneity is expected to gradually transition toward homogeneity owing to factors like drift, the natural cycle of births and deaths, and migrations, unless there are mechanisms in place to prevent this, like in humans [2]. Despite such changes of group composition in the studied chimpanzees, the group-specific variant preferences remained, suggesting the workings of stability-fostering mechanisms (also see [43,60]). One potent mechanism promoting group-level cultural stability is conformity—the tendency to copy the behaviour of the majority [2,28]. Whether chimpanzees are conformists remains disputed [43,61–64]—yet, the findings of this study warrant scrutiny of any chimpanzee behaviour that could bolster within-group cultural homogeneity across extended periods of time. In any case, where the minimal genetic and environmental variation across groups allows for inferring the cultural nature of the handclasp styles by means of the method of exclusion (also see [24,25]), the observed temporal stability of group-specific style preferences despite substantial population turnover provides a positive indication of the cultural hypothesis.

Recapitulating, chimpanzees retained group-specific grooming style preferences across a 12-year study period in which a substantial number of individuals replaced original group members owing to births, deaths and translocations. This stability of cultural variants indicates that (i) preliminary findings on social culture in chimpanzees are robust, (ii) animals can develop and maintain cultural preferences in the domain of arbitrary, non-fitness-related phenomena, much like the human species and (iii) animal cultures can possess the necessary ingredients in terms of variant adherence and longevity to be a potent force in gene–culture coevolutionary dynamics, thus shaping both phenotypes and genotypes in animals [12,13].

Extraversion development & sport participation effects: Children and adolescents who dropped out of sport showed greater decreases in extraversion than those who continued participation in sport

Extraversion development in childhood, adolescence and adulthood: Testing the role of sport participation in three nationally-representative samples. Mark S. Allen et al. Journal of Sports Sciences, May 20 2021. https://doi.org/10.1080/02640414.2021.1930672

Abstract: This research sought to test whether sport participation relates to the development of trait extraversion across three life phases. Sport participation and extraversion were measured in children aged 10.5 ± 0.5 years (n = 3600), in adolescents aged 14.5 ± 0.5 years (n = 3463), and in adults with a mean age of 49.4 ± 18.0 years (n = 12,280), with corresponding data collected four years earlier. There were small mean-level decreases in extraversion during childhood and adulthood, and a large decrease in extraversion during adolescence. Four-year rank-order stability in extraversion was .58 in childhood, .61 in adolescence and .76 in adulthood. Sport participation was associated with higher extraversion in all three samples. After controlling for sociodemographic factors, children and adolescents who dropped out of sport showed greater decreases in extraversion than those who continued participation in sport. Sport participation was unrelated to mean-level change in extraversion during adulthood. Sport participation was also associated with greater intra-individual stability in extraversion for children, adolescents and adults. There were no significant sex moderation effects for mean-level change or individual-level stability. These findings provide evidence that sport participation might have an important role in trait extraversion stability and change across the lifespan.

KEYWORDS: Child developmentintroversionlongitudinalpersonalityyouth sport

Neuroanatomy of Transgender Identity: Transgender persons differed significantly from cisgender persons with respect to (sub)cortical brain volumes and surface area, but not cortical thickness

Mueller SC, Guillamon A, Zubiaurre-Elorza L, et al. The Neuroanatomy of Transgender Identity: Mega-Analytic Findings From the ENIGMA Transgender Persons Working Group. J Sex Med 2021;XXX:XXX–XXX. May 21 2021. https://www.jsm.jsexmed.org/article/S1743-6095(21)00425-2/fulltext

Abstract

Background: In contrast to cisgender persons, transgender persons identify with a different gender than the one assigned at birth. Although research on the underlying neurobiology of transgender persons has been accumulating over the years, neuroimaging studies in this relatively rare population are often based on very small samples resulting in discrepant findings.

Aim: To examine the neurobiology of transgender persons in a large sample.

Methods: Using a mega-analytic approach, structural MRI data of 803 non-hormonally treated transgender men (TM, n = 214, female assigned at birth with male gender identity), transgender women (TW, n = 172, male assigned at birth with female gender identity), cisgender men (CM, n = 221, male assigned at birth with male gender identity) and cisgender women (CW, n = 196, female assigned at birth with female gender identity) were analyzed.

Outcomes: Structural brain measures, including grey matter volume, cortical surface area, and cortical thickness.

Results: Transgender persons differed significantly from cisgender persons with respect to (sub)cortical brain volumes and surface area, but not cortical thickness. Contrasting the 4 groups (TM, TW, CM, and CW), we observed a variety of patterns that not only depended on the direction of gender identity (towards male or towards female) but also on the brain measure as well as the brain region examined.

Clinical Translation: The outcomes of this large-scale study may provide a normative framework that may become useful in clinical studies.

Strengths and Limitations: While this is the largest study of MRI data in transgender persons to date, the analyses conducted were governed (and restricted) by the type of data collected across all participating sites.

Conclusion: Rather than being merely shifted towards either end of the male-female spectrum, transgender persons seem to present with their own unique brain phenotype.

First impressions, lack of judgement: Betting decisions are affected by uninformative racehorse names; betting returns on fast-sounding horses are lower compared to bets on other horses

Sonic Thunder vs. Brian the Snail. Are people affected by uninformative racehorse names? Oliver Merz, Raphael Flepp, Egon Franck. Journal of Behavioral and Experimental Economics, May 25 2021, 101724. https://doi.org/10.1016/j.socec.2021.101724

Highlights

• Betting decisions are affected by uninformative racehorse names.

• Winning probabilities of horses with fast-sounding names are overstated.

• Betting returns on fast-sounding horses are lower compared to bets on other horses.

• Affective betting decisions impair the betting market efficiency.

Abstract: This paper examines whether individuals’ decision making is affected by fast-sounding horse names in a betting exchange market environment. In horse racing, the name of a horse does not depend on the horse's performance and is thus uninformative. If positive affect towards fast-sounding horse names is present, we expect less accurate prices, i.e., winning probabilities and lower returns due to the increased demand for these bets. Using over 3 million horse bets, we find evidence that the winning probabilities of bets on horses with fast-sounding names are overstated, which impairs the prediction accuracy of such bets. This finding implies that prices in betting exchange markets are distorted by incorporating affective, misleading information from a horse's fast-sounding name. Consequently, this bias translates into significantly lower betting returns for horses with names classified as fast-sounding compared to the returns for all other horses.

Keywords: Affect heuristicDecision makingMarket efficiencyBetting marketHorse racing

JEL D40G40G41L83

5. Conclusion

Our paper contributes to the understanding of the role affect plays in human decision making. We extend the previous literature by testing the external validity of the findings in laboratory experiments using the real-life setting of betting markets in which decisions have a substantial financial impact. Moreover, this setting allows a clean investigation of biases in betting prices, avoiding the well-known problem of unknown fundamental values prevalent in traditional financial markets. Overall, our findings suggest that betting prices are biased due to people's positive affective feelings towards fast-sounding horses. Consequently, betting returns on horses with fast-sounding names are systematically lower than the returns on all other horses. This result suggests that bettors should avoid jumping on the bandwagon when many other bettors are tempted to base their investment decisions on irrelevant factors and instead be aware of the potential mispricing of such bets.

While the prohibition of certain horse names might seem to be a first approach to correct the suboptimal decisions caused by affective feelings in our setting, the implementation of this kind of regulation in practice would cause both significant transaction costs and severe limitations on freedom. Even if we abstracted from the second point, the definition, validation, permanent adaptation and implementation of a “list of affect-enhancing horse names” would be a giant task. Further, even if this regulatory strategy somehow worked, it would just contribute to a solution in horse-betting, which is a relatively small field of the entire economy. Therefore, this regulatory strategy cannot serve as a remedy for the general problem that affective feelings towards objectively irrelevant attributes presumably distort decisions in other areas of the economy.

Awareness-raising strategies seem to be a more promising avenue to deal with affect in decision-making, according to psychology and neuroscience research stating that managing affect requires constant awareness of it (Peterson, 2007). Our article increases this awareness by clearly showing that affect plays a role in a real-life setting. This raises the question of whether affective feelings towards certain objectively irrelevant attributes might be even more prevalent in society than anticipated so far. Affective reactions presumably are not limited to suboptimal decisions in laboratory experiments or people's decisions in private life, such as excessive shopping or smoking, but might also impact large-scale areas starting from inefficient betting market prices to bubbles in stock markets to outcomes of political elections. The more research shows that affect leads to suboptimal decisions in a variety of areas, the greater the awareness of this phenomenon will be.

Additional field-specific regulations aiming to raise awareness among relevant decision-makers must be built on further research. So far, it remains unclear which measures – e.g., warnings that bettors would have to read or declarations that bettors would have to sign before placing their bets – could lead to increased self-monitoring and reduce the impact of affect in the horse-betting context in our paper.

Video chats undermine the collective intelligence of groups, but in a surprising way: It turns out it is the video, & not the chat, that is the problem. Teams with video on during calls end up syncing up less, & have less even turn-taking during meetings. Turn off your video?

Tomprou M, Kim YJ, Chikersal P, Woolley AW, Dabbish LA (2021) Speaking out of turn: How video conferencing reduces vocal synchrony and collective intelligence. PLoS ONE 16(3): e0247655, Mar 18 2021. https://doi.org/10.1371/journal.pone.0247655

Abstract: Collective intelligence (CI) is the ability of a group to solve a wide range of problems. Synchrony in nonverbal cues is critically important to the development of CI; however, extant findings are mostly based on studies conducted face-to-face. Given how much collaboration takes place via the internet, does nonverbal synchrony still matter and can it be achieved when collaborators are physically separated? Here, we hypothesize and test the effect of nonverbal synchrony on CI that develops through visual and audio cues in physically-separated teammates. We show that, contrary to popular belief, the presence of visual cues surprisingly has no effect on CI; furthermore, teams without visual cues are more successful in synchronizing their vocal cues and speaking turns, and when they do so, they have higher CI. Our findings show that nonverbal synchrony is important in distributed collaboration and call into question the necessity of video support.

Discussion

We explored what role, if any, video access to partners plays in facilitating collaboration when partners are not collocated. Though we found no direct effects of video access on collective intelligence or facial expression synchrony, we did find that in the video condition, facial expression synchrony predicts collective intelligence. This result suggests that when visual cues are available it is important that interaction partners attend to them. Furthermore, when video was available, social perceptiveness predicted facial synchrony, reinforcing the role this individual characteristic plays in heightening attention to available cues. We also found that prosodic synchrony improves collective intelligence in physically separated collaborators whether or not they had access to video. An important precursor to prosodic synchrony is the equality in speaking turns that emerges among collaborators, which enhances prosodic synchrony and, in turn, collective intelligence. Surprisingly, our findings suggest that video access may, in fact, impede the development of prosodic synchrony by creating greater speaking turn inequality, countering some prevailing assumptions about the importance of richer media to facilitate distributed collaboration.

Our findings build on existing research demonstrating that synchrony improves coordination [30, 33] by showing that it also improves cognitive aspects of a group, such as joint problem-solving and collective intelligence in distributed collaboration. Much of the previous research on synchrony has been conducted in face-to-face settings. We offer evidence that nonverbal synchrony can occur and is important to the level of collective intelligence in distributed collaboration. Furthermore, we demonstrate different pathways through which different types of cues can affect nonverbal synchrony and, in turn, collective intelligence. For example, prosodic synchrony and speaking turn equality seem to be important means for regulating collaboration. Speaking turns are a key communication mechanism operating in social interaction by regulating the pace at which communication proceeds, and is governed by a set of interaction rules such as yielding, requesting, or maintaining turns [18]. These rules are often subtly communicated through nonverbal cues such as eye contact and vocal cues (e.g., back channels), altering volume and rate [18]. However, our findings suggest that visual nonverbal cues may also enable some interacting partners to dominate the conversation. By contrast, we show that when interacting partners have audio cues only, the lack of video does not hinder them from communicating these rules but instead helps them to regulate their conversation more smoothly by engaging in more equal exchange of turns and by establishing improved prosodic synchrony. Previous research has focused largely on synchrony regulated by visual cues, such as studies showing that synchrony in facial expressions improves cohesion in collocated teams [30]. Our study underscores the importance of audio cues, which appear to be compromised by video access.

Our findings offer several avenues for future research on nonverbal synchrony and human collaboration. For instance, how can we enhance prosodic synchrony? Some research has examined the role of interventions to enhance speaking turn equality for decision making effectiveness [67]. Could regulating conversational behavior increase prosodic synchrony? Furthermore, does nonverbal synchrony affect collective intelligence similarly in larger groups? For example, as group size increases, a handful of team members tend to dominate the conversation [68] with implications for spoken communication, nonverbal synchrony, and ultimately collective intelligence. Our results also underscore the importance of using behavioral measures to index the quality of collaboration to augment the dominant focus on self-report measures of attitudes and processes in the social sciences, because collaborators may not always report better collaborations despite exhibiting increased synchrony and collective intelligence [2, 10]. Our study has limitations, which offer opportunities for future research. For example, our findings were observed in newly formed and non-recurring dyads in the laboratory. It remains to be seen whether our findings will generalize to teams that are ongoing or in which there is greater familiarity among members, as in the case of distributed teams in organizations. We encourage future research to test these findings in the field within organizational teams.

Overall, our findings enhance our understanding of the nonverbal cues that people rely on when collaborating with a distant partner via different communication media. As distributed collaboration increases as a form of work (e.g., virtual teams, crowdsourcing), this study suggests that collective intelligence will be a function of subtle cues and available modalities. Extrapolating from our results, one can argue that limited access to video may promote better communication and social interaction during collaborative problem solving, as there are fewer stimuli to distract collaborators. Consequently, we may achieve greater problem solving if new technologies offer fewer distractions and less visual stimuli.

We analyzed all first marriages reported in 2010–2014 in South Korea and compared men who married Korean brides (N = 1,088,457) with those who purchased their brides (N = 45,528)

Men's revealed preference for their mates' ages. Kitae Sohn. Evolution and Human Behavior, Volume 38, Issue 1, January 2017, Pages 58-62. https://doi.org/10.1016/j.evolhumbehav.2016.06.007

Abstract: Both young and old men say that they are sexually attracted to young, fertile women, but older men tend to marry older women, including those who are peri- and post-menopausal. We assessed men's freely revealed preference for their mates' age using an unusual marriage phenomenon in South Korea: the practice in which men purchase their brides from developing countries. Presumably, the men's mate choice, at least regarding the brides' age, is unrestricted by women. We analyzed all first marriages reported in 2010–2014 in South Korea and compared men who married Korean brides (N = 1,088,457) with those who purchased their brides (N = 45,528); the age range of grooms and brides was 15–59. While the former exhibited the typical pattern where older men married older women, the latter, whether young or old, always married young, fertile women. This finding is consistent with men's stated preference for young, fertile women in mating and suggests that the typical pattern is generated by women's limiting role in mating.

Keywords: SexEvolutionMarriagePurchase of brideReproductionSouth Korea

We conclude that Shank's 1980 observation, that intelligence is all about generalization and that AI is not particularly good at this, has, so far, withstood the test of time

How much intelligence is there in artificial intelligence? A 2020 update. Han L.J. van der Maas, Lukas Snoek, Claire E. Stevenson. Intelligence, Volume 87, July–August 2021, 101548. https://doi.org/10.1016/j.intell.2021.101548

Highlights

• Recent AI breakthroughs, such as deep learning and reinforcement learning, have deep roots in psychology.

• Modern AI models are much more human and brain like at the implementational level.

• There is nothing wrong with AI's crystallized intelligence, but generalization is still a weakness of AI systems.

• The psychological relevance of AI extends to areas such as the study of individual differences and cognitive development.

• We expect fruitful interactions with regard to the measurement of natural and artificial intelligence.

Abstract: Schank (1980) wrote an editorial for Intelligence on “How much intelligence is there in artificial intelligence?”. In this paper, we revisit this question. We start with a short overview of modern AI and showcase some of the AI breakthroughs in the four decades since Schank’s paper. We follow with a description of the main techniques these AI breakthroughs were based upon, such as deep learning and reinforcement learning; two techniques that have deep roots in psychology. Next, we discuss how psychologically plausible AI is and could become given the modern breakthroughs in AI’s ability to learn. We then access the main question of how intelligent AI systems actually are. For example, are there AI systems that can solve human intelligence tests? We conclude that Shank's observation, that intelligence is all about generalization and that AI is not particularly good at this, has, so far, withstood the test of time. Finally, we consider what AI insights could mean for the study of individual differences in intelligence. We close with how AI can further Intelligence research and vice versa, and look forward to fruitful interactions in the future.

Keywords: Artificial IntelligenceDeep learningIndividual differencesIntelligence testsReinforcement

5. Discussion

AI has seen multiple cycles of enthusiasm and disappointment, but the current wave seems to be of a different order. As we stated in the introduction of this paper, one of the original goals of AI was to learn more about human intelligence. This endeavor could be misguided as AI may only produce “cognitive wheels”, techniques that have no equivalent in human cognition. In this paper we argued that this might have been true for some older approaches (e.g., brute force search techniques), but is less the case for much of current AI. The progress made in recent years is certainly technologically driven, but inspired by biological and psychological knowledge about human information processing and learning.

We expect that the recent progress in AI will change the way we think about intelligence. AI forces us to rethink the definition of intelligence. Definitions that center on just information processing and problem solving are perhaps insufficient. Shank's observation that intelligence is all about generalization has, so far, withstood the test of time. Many information processing problems, from processing speech to playing chess, appear to be less difficult than perhaps expected. The really hard problem is to deal with completely novel cases. One requirement for solving this hard problem is the ability to learn invariant and thus generalizable patterns. And especially with regard to learning, the progress in AI has been spectacular. The main difference between AI systems of the past, such as expert systems, and modern AI is the fact that they learn. That deep learning and reinforcement learning, the core techniques in current AI, have deep roots in psychology is remarkable and promising for studying how artificial and human intelligence are related.

AI is relevant to intelligence research because it enhances our understanding of the core mechanisms of human cognition. How the immense neural systems in our brain are able to process extremely complicated information such as speech and produce logical thinking is an extremely difficult question. Having an artificial system that performs such tasks using the same basic principles is extremely useful. Classic questions regarding the modularity of the mind, the origin of creativity, and the organization of long-term memory spring to mind. In addition, we argued that the psychological relevance of AI extends to unexpected areas such as the understanding of individual differences and the development of cognition. It is relatively easy to create a population of AI systems with minor differences in architecture and training regime. Modern AI provides us with a new playing field for individual differences research.

On a practical level we expect fruitful interactions regarding the measurement of natural and artificial intelligence. As modern AI systems are incredibly complex, our experience in examining such systems may be relevant for AI. Vice versa, insights from AI may lead to new developments in (adaptive) intelligence testing and educational interventions.

We attempted to shed light on the future of intelligence research from the point of view of AI. Our overview is necessarily limited and probably quickly outdated, but hopefully we have given intelligence researchers some insights in the rapid developments in AI and the possible consequences for our field.

Australia & UK: Gay & bisexual men, men who ‘prefer not to say,’ and gay women are less satisfied with their lives; in the UK is the same but for gay women, who do not have a lower level of satisfaction

Sexual orientation and life satisfaction. David Bartram. Journal of Sociology, May 19, 2021. https://doi.org/10.1177/14407833211017672

Abstract: Existing quantitative research on sexual orientation and life satisfaction uses models with control variables that do not have a clear rationale. With a correct understanding of what control variables do, no controls are necessary to estimate the consequences of sexual orientation on life satisfaction. An analysis constructed from this perspective reveals gay and bisexual men in the UK and Australia are less satisfied with their lives (relative to heterosexual men). Bisexual women in both countries are less satisfied as well. Lesbians in Australia are less satisfied (relative to straight women) – but lesbians in the UK do not have lower satisfaction. These conclusions hold also in an analysis that considers the possibility that some non-heterosexual people might be unwilling to disclose their sexual orientation on surveys.

Keywords: Australia, control variables, life satisfaction, sexual orientation, United Kingdom

Conclusion

Having a non-normative sexual orientation in the UK and Australia comes with consequences – including a lower level of life satisfaction. The only exception to that general pattern is lesbian women in the UK. The gap is especially large for bisexuals, of both sexes, and in both countries. There is also a striking negative coefficient for Australian men who ‘prefer not to say’. It is not hard to imagine that there must be a reason some Australian men prefer not to disclose their sexual orientation (especially if what they prefer not to disclose is: not being straight).

Researchers should be confident in perceiving that the right way to model the impact of sexual orientation on SWB is to exclude ‘other determinants’ as controls in this context – because the other determinants of SWB cannot also be determinants of sexual orientation. That assertion forms the key recommendation for future research on this topic. Building larger models with many control variables might appear desirable simply because a more parsimonious model (especially one containing no controls) might seem unpersuasive (e.g. to potential anonymous reviewers). But size on its own is hardly a coherent criterion for constructing an analytical model whose purpose is to gauge a causal impact (see e.g. Gangl, 2010).

The fact that lesbians in the UK report life satisfaction on a par with that of heterosexual women (in contrast with the life satisfaction deficit among gay men) is a striking finding, perhaps at odds with what one might expect, given the context of stigma and discrimination that commonly confronts people belonging to a sexual minority. Being gay in a heteronormative society sometimes goes with a perceived loss of masculinity and thus a reduction in status more generally (Connell, 1995); the lower life satisfaction among gay men is arguably understandable in these terms. A similar dynamic might not apply to the experience of lesbians to the same extent, perhaps in part because women in general already have lower social status in a patriarchal society such as the UK.

There is a genuine limitation of the analysis presented here: the findings describe average impacts pertaining to the categories available in the data and thus do not capture the diversity of experiences that go under the heading of being ‘gay’, ‘lesbian’, ‘bisexual’, etc. That point applies as well to the way people might choose from the available options on a survey question, at a single point in time. There are many ways to be non-heterosexual and indeed to be heterosexual, with imprecise and fluid boundaries for many (Cover, 2019). The fact that the available response categories inhibit a more fine-grained analysis does not mean this point is anything other than a limitation. The analysis in this article gives us average effects of belonging to an indicated category; for some individuals a negative impact will exceed that average, while for others the impact might be less negative or perhaps even null (cf. Feinstein et al., 2015). Even so, any attempt to gauge effects in a finer grain must ensure a correct use of control variables, along the lines developed in this article.

Although early sexual intercourse may be associated with increased depressive symptoms, first intercourse was, on average, associated with decreased psychological distress for both male & female late adolescents

Changes in psychological distress after first vaginal intercourse in late adolescence. Sara A. Vasilenko, Eva S. Lefkowitz, Jennifer L. Maggs. Journal of Adolescence, Volume 89, June 2021, Pages 213-216. https://doi.org/10.1016/j.adolescence.2021.05.003

Abstract

Introduction: Although early sexual intercourse may be associated with increased depressive symptoms, little research has examined whether first intercourse in late adolescence is associated with changes in mental health.

Methods: This paper uses 3 years of longitudinal data from previously sexually abstinent late adolescent students at a large state university in the northeastern United States (N = 144, 53.5% male, M age = 18.5 years old, 47.2% White, 26.4% Asian/Hawaiian/Pacific Islander, 20.1% Hispanic/Latino, 18.1% Black/African American) to examine whether levels of psychological distress changed after first intercourse.

Results: Students’ distress decreased after first intercourse, although this effect was only significant two or more semesters after first intercourse. There were no gender differences in these associations.

Conclusions: Findings suggest first intercourse was, on average, associated with decreased psychological distress for both male and female late adolescents.

Keywords: Sexual behaviorMental healthFirst intercourse

A substantial share of Americans express readiness to sell their votes for cash: 12% of respondents would do so for just $25, as would nearly 20% for $100

Would You Sell Your Vote? Jordan Gans-Morse, Simeon Nichter. American Politics Research, May 24, 2021. https://doi.org/10.1177/1532673X211013565

Abstract: Prominent scholars in recent years have expressed alarm about political polarization, weakened civil liberties, and growing support for authoritarianism in the United States. But discussions of democratic backsliding pay short shrift to the value citizens place on one of the most fundamental democratic institutions: the act of voting. Drawing on nationally representative survey data, we show that despite traditional portrayals of the U.S. as the embodiment of a democratic “civic culture,” a substantial share of Americans express readiness to sell their votes for cash: 12% of respondents would do so for just $25, as would nearly 20% for $100. Citizens who place low importance on living in a democracy are significantly more willing to sell their votes. We argue that heightened attention to US voters’ attitudes toward clientelism would provide an additional barometer of democratic skepticism, help to integrate the study of American and comparative politics, and stimulate novel research agendas about the historic decline of vote buying in the United States.

Keywords: elections, democracy, vote buying, clientelism, machine politics

Rats can have consecutive ejaculations, with a short inter-ejaculatory interval, and no mounts or intromissions before the second ejaculation

The Rare Phenomenon of Consecutive Ejaculations in Male Rats. Joanna M. Mainwaring, Angela C. B. Garcia, Elaine M. Hull and Erik Wibowo. Sexes 2021, 2(2), 183-188, May 20 2021. https://doi.org/10.3390/sexes2020016

Abstract: Mounting, intromission and ejaculation are commonly reported sexual behaviours in male rats. In a mating session, they can have several copulatory series with post-ejaculatory intervals in between ejaculations before they reach sexual satiety. Here, we describe a phenomenon where male rats displayed consecutive ejaculations (CE) with a short inter-ejaculatory interval (IEI). Male rats were daily mated with a sexually receptive female rat. Two out of 15 rats displayed CE in one of their mating tests. The first rat had CE at 9.9 and 10.1 min (IEI = 16.3 s) after the start of the test. The second rat showed CE at 28.1 and 28.5 min (IEI = 18.7 s) after the test onset. During the IEI, the rats did not show any mounting or intromission.

Keywords: multiple ejaculations; male rodents; male sexual behaviour; multiple orgasms; consummatory behaviour; refractory period

1. Introduction

Male sexual behaviours in rodents are characterised by three distinct behaviours: mounting, intromission, and ejaculation [1,2]. During an ejaculation, there is a vaginal penetration (the deep forward pelvic thrust), and the male rat freezes on the female for one to three seconds [1]. While the actual semen expulsion is not usually visible, a plug can occasionally be found in the vagina or surrounding area because rat semen coagulates quickly to form a plug. Typically, a male rat could reach an ejaculation after a series of mounts and intromissions. Following ejaculation, the rat enters a refractory period, during which he does not respond to sexual stimuli for several minutes [3] before he resumes another series of mounts and intromissions until the next ejaculation. Male rats can have multiple copulatory series for about 150 min [4], ranging from 5 to 12 copulatory series [5]. After this, the rats will reach sexual satiety or sexual exhaustion, and remain sexually inactive for a prolonged period of time.

Recently, we conducted a study on the impact of chronic sleep deprivation (CSD) on male sexual behaviours in rodents [6]. The study involved sexually experienced male rats, which were subjected to CSD, imposed by keeping them awake for the last four hours of the light phase. Control rats were left undisturbed in their home cage at the same time of day. In that study, two of the rats (one from each group) showed two consecutive ejaculations (CE), separated by <20 s. In reviewing the literature for such behaviour, some studies have reported that rats are capable of having multiple ejaculations in a single mating session, and each pair of ejaculations is separated by a post-ejaculatory interval (PEI), as well as a series of mounts and intromissions [5,7]. However, we did not find any report stating that rats can have CE, with a short inter-ejaculatory interval (IEI), and no mounts or intromissions before the second ejaculation.

As in rodents, humans can also display ejaculation, i.e., expulsion of semen following penile stimulation (be it during solo masturbation or penetrative sex). However, humans can also experience an orgasm, i.e., an intense, pleasurable response to genital or non-genital stimulation [8]. In humans, ejaculation and orgasm may be perceived as a single event, even though they are not the same biological process [9]. Furthermore, there is evidence that some men can have an ejaculation without having an orgasm [10,11], and some men can have an orgasm without an ejaculation [12,13,14,15]. There are also case reports on men who can have multiple ejaculations within a short period, but they required at least a few minutes of sexual stimulation between ejaculations [16,17]. However, to date, we are aware of no published report of men who can have ejaculations with no sexual stimulation (e.g., penile stimulation) before the second ejaculation. Despite this, one of us (EW) has received several anecdotal claims from men who reported having minimal or no refractory periods and are able to have multiple ejaculations with and without orgasms within a narrow time frame. This raises the question of whether the CE behaviour that we observed in our rats could be used as a model for multiple ejaculations and/or multiple orgasms in men.

The CE behaviour in rodents may bear a resemblance to men with minimal or short refractory periods, who can have multiple ejaculations. However, whether the CE behaviour can mimic multiple orgasms in men is difficult to answer, because we cannot assess orgasm in rats. Pfaus et al. [18] recently described how rats can have orgasm-like responses. For example, during ejaculation, male rats have pelvic floor contractions [19], as are also observed in humans [20]. Whether or not a rat experiences orgasm as a human does, in the presence of a receptive partner, a male rat will approach her in a way to maximise the ‘reward’ associated with ejaculation.

The purpose of this article is to describe a rare phenomenon where rats displayed two ejaculations consecutively with a short IEI, and no mounts or intromissions, between them. This behaviour was observed in one strain of inbred laboratory animals. To date, there is no documentation of whether other strains or non-laboratory rats can also show such behaviour.

4. Discussion

For the first time, we report CE in male rats. Currently, it remains unknown what the neurobiological basis is for them to show such behaviour, such as hormonal or neurotransmitter factors that can affect the ability to have CE. In addition, it remains unclear to what extent penile grooming post-ejaculation plays a role in stimulating the second ejaculation during CE. Sensory input from the genitals during genital grooming may be conveyed to the spinal ejaculation generator in the lumbar spinal cord [25]. However, one of the CE rats groomed his genitals in between ejaculations, but the other one did not.

We are aware of no published data on similar behaviour in humans either. As noted above, one of us (EW) received several anecdotal claims from men with no or minimal refractory periods, who reported CE. However, there are published data that some men reported multiple orgasms with ejaculations with intervals of several minutes between them [9]. Undoubtedly, the volume of the ejaculate decreases with subsequent ejaculations [16]. Another observation in a man with such an ability showed that the person did not have orgasm/ejaculation-induced prolactin release [17]. It remains to be determined whether the dampening of prolactin release after ejaculations may play a role in the CE in rats. Another potential mechanism for the CE we observed may involve a change in the serotonergic system. Past studies indicate that the administration of a 5-HT1A receptor agonist reduces the number of intromissions before ejaculation and shortens the ejaculation latency in male rats [26,27]. Considering that the animals in our study were not treated with any serotonergic agents, there is a possibility that they may have individual variation in their serotonergic system.

Future study in this area will be challenging, given the rarity of the phenomenon, and we cannot predict when they would show such a behaviour. One potential future study would be to explore hormonal (e.g., on prolactin) and neurobiological (e.g., on the serotonergic system) differences between rats who are and are not capable of having CE. It would be interesting to investigate whether prolactin receptor knock-out rodents display CE at an elevated frequency compared to wild-type rodents. Another possibility is to test whether some psychostimulants can increase the frequency of displaying CE, because some men have reported having multiple orgasms while having sex under the influence of psychostimulants, although it is unclear if they also had ejaculations [9].