Nudges: Our megastudy with 689,693 Walmart pharmacy customers demonstrates that text-based reminders can encourage pharmacy vaccination

A 680,000-person megastudy of nudges to encourage vaccination in pharmacies. Katherine L. Milkman et al. Proceedings of the National Academy of Sciences, February 8, 2022 119 (6) e2115126119; https://doi.org/10.1073/pnas.2115126119

Significance: Encouraging vaccination is a pressing policy problem. Our megastudy with 689,693 Walmart pharmacy customers demonstrates that text-based reminders can encourage pharmacy vaccination and establishes what kinds of messages work best. We tested 22 different text reminders using a variety of different behavioral science principles to nudge flu vaccination. Reminder texts increased vaccination rates by an average of 2.0 percentage points (6.8%) over a business-as-usual control condition. The most-effective messages reminded patients that a flu shot was waiting for them and delivered reminders on multiple days. The top-performing intervention included two texts 3 d apart and stated that a vaccine was “waiting for you.” Forecasters failed to anticipate that this would be the best-performing treatment, underscoring the value of testing.

Abstract: Encouraging vaccination is a pressing policy problem. To assess whether text-based reminders can encourage pharmacy vaccination and what kinds of messages work best, we conducted a megastudy. We randomly assigned 689,693 Walmart pharmacy patients to receive one of 22 different text reminders using a variety of different behavioral science principles to nudge flu vaccination or to a business-as-usual control condition that received no messages. We found that the reminder texts that we tested increased pharmacy vaccination rates by an average of 2.0 percentage points, or 6.8%, over a 3-mo follow-up period. The most-effective messages reminded patients that a flu shot was waiting for them and delivered reminders on multiple days. The top-performing intervention included two texts delivered 3 d apart and communicated to patients that a vaccine was “waiting for you.” Neither experts nor lay people anticipated that this would be the best-performing treatment, underscoring the value of simultaneously testing many different nudges in a highly powered megastudy.

Keywords: vaccinationCOVID-19nudgeinfluenzafield experiment

Discussion

The results of this megastudy suggest that pharmacies can increase flu vaccination rates by sending behaviorally informed, text-based reminders to their patients. Further, although all interventions tested increased vaccination rates, there was significant variability in their effectiveness. Attribute analyses suggest that the most-impactful interventions employed messages sent on multiple days and conveyed that a flu vaccine was already waiting for the patient. These insights from our megastudy of flu vaccinations can potentially inform efforts by pharmacies and hopefully also providers and governments around the world in the ongoing campaign to encourage full vaccination against COVID-19.

The first- and second-best-performing messages in our megastudy repeatedly reminded patients to get a vaccine and stated that a flu shot was “waiting for you.”§ This aligns with prior research suggesting multiple reminders can help encourage healthy decisions (13). In terms of message content, communicating that a vaccine is “waiting for you” may increase the perceived value of vaccines, in accord with research on the endowment effect showing that we value things more if we feel they already belong to us (33). Further, because defaults convey implicit recommendations, this message may imply that the pharmacy is recommending vaccination (34)—otherwise, why would they have allocated a dose to you? Relatedly, this phrasing implies that the patient already agrees that getting the vaccine is desirable. Finally, saying a vaccine is “waiting for you” may suggest that getting a vaccine will be fast and easy.

Remarkably, the three top-performing text messages in a different megastudy, which included different intervention messages encouraging patients to get vaccines at an upcoming doctor’s visit, similarly conveyed to patients that a vaccine was “reserved for you.” (8) The Walmart megastudy tested a wide range of different messaging tactics designed by different researchers to explore largely different hypotheses such that the two megastudies had very limited overlap in their content. Further, our outcome variable here was electing to get a vaccine in a Walmart pharmacy, whereas the prior megastudy examined whether patients accepted a proffered vaccine in a doctor’s office. Despite differences in the messenger (pharmacy versus primary care provider), the outcome (seeking a vaccine at a pharmacy versus passively accepting one in a doctor’s office), and the messages actually tested, and despite analyzing our data without incorporating any priors, the results of the two megastudies converged, painting a consistent picture of what works. Together, this evidence suggests that sending reminder messages conveying that vaccines are “reserved” or “waiting” for patients is an especially effective communications strategy in the two most-common vaccination settings in the United States (16). While more research is needed to establish boundary conditions, it is notable that a follow-up study that built on the findings from these two megastudies and adapted the best-performing treatment to nudge COVID-19 vaccinations in the winter of 2021 found convergent results (9).

The scientists who designed interventions in our megastudy were not able to accurately forecast the average or relative performance of text message interventions designed to boost vaccinations. In contrast, lay survey respondents made fairly accurate predictions of both. This contradicts past research showing that experts are generally better at predicting the effectiveness of behavioral interventions than nonexperts (35). One possible explanation is that direct involvement in the design of interventions led to bias. Another possibility is that nonexperts are generally more-accurate relative forecasters in this particular field setting. Regardless, the inability of either scientists or laypeople to anticipate the top-performing intervention underscores the value of empirical testing when seeking the best policy.

The strengths of this megastudy include its massive, national sample, statistical power, an objective measure of vaccination obtained longitudinally over a 3-mo follow-up period, and simultaneous comparison of many different interventions. Several important weaknesses are also worth noting. First, we were only able to measure the impact of our interventions on vaccinations received at Walmart pharmacies. We cannot assess whether interventions increased vaccinations in other locations or, in fact, crowded out vaccinations in other settings. Past research found no meaningful evidence of crowd-in or crowd-out from reminder messages nudging vaccine adoption (4), but we cannot rule out either possibility. Another limitation is that the population studied only included patients who had received an influenza vaccine at a Walmart pharmacy in the prior flu season and agreed to receive SMS communications from Walmart pharmacy. Even so, our key findings are consistent with a different megastudy nudging vaccination at doctors’ visits (8), in which results were not moderated by prior vaccination status. It would be ideal to replicate and extend this megastudy with patients who have no prior history of vaccination. Relatedly, while we did not observe meaningful heterogeneity in treatment effects by available demographics, future research exploring heterogeneous treatment effects with a richer set of individual difference variables would be valuable.

Men are less religious in more gender-equal countries

Men are less religious in more gender-equal countries. Jordan W. Moon, Adam E. Tratner and Melissa M. McDonald. Proceedings of the Royal Society B: Biological Sciences, February 2 2022. https://doi.org/10.1098/rspb.2021.2474

Abstract: Sex differences in religiosity are cross-culturally common and robust, yet it is unclear why sex differences in some cultures are larger than in others. Although women are more religious than men in most countries, religions frequently provide asymmetrical benefits to men at the expense of women. Two global analyses (51 countries and 74 countries) found that country-level gender equality was consistently and negatively associated with religiousness (i.e. religious attendance, reported importance of God and frequency of prayer) for men, more than for women, leading to a larger sex difference in religiousness in more gender-equal countries. Results were especially robust for religious attendance, and hold accounting for country-level wealth, as well as individuals' religious affiliation, the moralization of sexuality, age and education level. We interpret results through a rational choice lens, which assumes that people are more drawn to religion when it is consistent with their reproductive goals.

4. Discussion

These data show that gender equality across cultures consistently and negatively predicts religious belief and behaviour among men, but the effect is small and inconsistent for women. This interaction between gender equality and participant sex holds in most of the models we ran, even when accounting for the clustering of countries within sub-regions, the religious denominations of participants, sociosexuality, age, education and country-level wealth.

The results were particularly strong with religious attendance as an outcome; in all such models there was a consistent negative relationship between gender equality and religious attendance for men, but no effect for women. We suggest that religious attendance (versus private religious behaviour or belief) is the outcome most relevant to our hypothesis. That is, it is attendance and overt participation that we would expect to be associated with the reproductive outcomes of interest. Overt religious participation may allow men to more easily monitor women, police sexual behaviour or to signal their value as a mate via religious commitment.

In addition, the focal results were driven by gender equality in education and economic participation, but not political power or health/survival. These results could be consistent with the view of religion as a ‘costly signal’ to indicate qualities such as trustworthiness, dedication to one's family or even simply dedication to one's group [7,37–39,62–64]; gender equality might also influence the payoffs of using religion as a costly signal. For instance, there is some evidence that women's economic dependence on men—which makes paternal certainty more critical—facilitates moralization of promiscuity [65]. It follows, then, that women who are dependent on men (i.e. when gender equality is low) may prioritize signals of paternal investment and long-term commitment; this could, in turn, incentivise men in these societies to use religion as a signal of their willingness to invest in their offspring [7,39].

One could also predict the same pattern by considering other functions of religion. For example, religion fosters cooperation and ingroup cohesion [66,67] and can help people manage their existential insecurities [41]. Indeed, religions are especially attractive to people after facing mortal threats, such as intergroup conflict [68]. One alternative explanation, then, could be that countries that have achieved greater gender equality face fewer threats that require male coalitional coordination (e.g. warfare); therefore, people (particularly men) in these countries are less likely to view religion as necessary. We reiterate, however, that our analyses are unable to reveal the mechanism behind the observed effects, or to adjudicate between alternative explanations.

Our hypothesis stems from a rational choice perspective on religion [9], suggesting that engagement in religious behaviours and beliefs might stem partly from the reproductive benefits people acquire from them [9,16,18]. Because religions often involve costly behaviour [69,70], one should expect religious engagement to be more likely when the benefits outweigh the costs. If indeed one of the functions of religion is reproductive support that often favours men over women, and if the manipulation of women in such ways (e.g. through modesty norms or proscribing sexual promiscuity) is less accepted in more gender-equal societies, the costs may outweigh the benefits for men in these societies, resulting in lower religiousness among men.

Feminist-identified men were substantially more likely to report Erectile Dysfunction Medication use than non-feminist men; could be that feminist men are more honest about this usage, or that non-feminist ones see using it as a threat to masculinity

Silva, Tony, and Tina Fetner. 2022. “Men’s Feminist Identification and Reported Use of Prescription Erectile Dysfunction Medication.” SocArXiv. February 1. doi:10.1080/00224499.2022.2029810

Abstract: We analyzed data from the 2018 Sex in Canada survey (n = 1,015 cisgender men) to examine the association between feminist identification and reported use of prescription ED medication (EDM) during men’s last sexual encounter. Feminist-identified men were substantially more likely to report EDM use than non-feminist men, even after controlling for alcohol use before sex, erection difficulties, sexual arousal, sexual health, mental health, and physical health. One explanation is that feminist men may use EDM to bolster their masculinity when it is otherwise threatened by their identification as feminist. Another is that non-feminist men may be less likely to use prescription EDM because they view accessing healthcare services as a threat to their masculinity. It is also possible that feminist men are more likely to use EDM because they wish to maintain an erection to better please their partner. Lastly, feminist men may be more honest about EDM use than non-feminist men, even though rates are similar. Regardless of the exact reason, therapists can use these results to tailor sexual health messages to clients based on feminist identification. Future work could employ qualitative methods to understand why feminist men report higher rates of EDM use than non-feminist men.

The size and homophily of friendship networks are to a substantial degree based on genetic influence; no evidence found that shared hobbies, education, or Big Five personality traits affect networks

Heritability in friendship networks. Michael Neugart, Selen Yildirim. Journal of Economic Behavior & Organization, Volume 194, February 2022, Pages 41-55. https://doi.org/10.1016/j.jebo.2021.12.008

Highlights

• Heritability of overall friendship network characteristics is explored.

• Data from German TwinLife Study is analyzed within classical twin design.

• Genetic component found in twins’ network size and network homophily.

• Role of twins’ shared hobbies, education, and personality traits is analyzed.

Abstract: There is considerable evidence nowadays that friendship networks account for a large part of an individual’s success or failure in life. Little, however, is known about the extent to which friendship networks are associated with an individual’s genotype. Using data from the German TwinLife study, we explore, within a classical twin design, whether friendship networks are related to genes. We find a substantial heritability component in twins’ network sizes and network homophily, but not in twins’ network closeness. The genetic influence on network characteristics may be attributable to traits which are themselves influenced by genetic factors. Addressing indirect ways in which genes could influence network characteristics, we do not find evidence that shared hobbies, education, or Big Five personality traits affect networks.

Keywords: Social networksTwinsBehavioral geneticsHobbiesBig fiveEducation

Heterosexual women's exposure to a same-sex peer who constituted a sexual rival (straight/bisexual) led to more spreading of reputation-damaging information vs. reputation-enhancing info, compared with exposure to a noncompetitor (lesbian target)

Bakolas, N. K. M., & Park, J. H. (2022). Female intrasexual competition is affected by the sexual orientation of the target and the ovulatory cycle. Evolutionary Behavioral Sciences, Feb 2022. https://doi.org/10.1037/ebs0000287

Abstract: Research suggests that women use indirect aggression strategies to compete with same-sex peers and improve their mating prospects. One such tactic involves strategically transmitting reputation-damaging information as opposed to reputation-enhancing information, to lessen the appeal of sexual rivals. The present study further examined whether this strategic information transmission constitutes an intrasexual competition strategy, by comparing denigration of same-sex peers who constitute sexual competitors or noncompetitors as determined by their sexual orientation. This study also explored the impact of the ovulatory cycle on this strategy, following research suggesting that hormone fluctuation drives subtle behavioral changes near ovulation, amplifying other forms of intrasexual competition between women. Results indicated that among women identifying as straight, exposure to a same-sex peer who constituted a sexual rival (straight/bisexual target) led to greater transmission of reputation-damaging information relative to reputation-enhancing information, compared with exposure to a noncompetitor (lesbian target). The ovulatory cycle was found to be associated with denigration, but this did not depend on the sexuality of the target. Participants in the estimated high-estrogen phase showed greater denigration overall than participants in the low-estrogen phase, regardless of the target’s sexuality.

Women's pick-up lines are perceived as most effective when they are direct and unmistakable, particularly by men

Wade, T. J., Fisher, M. L., & Gaines, L. (2022). The perceived effectiveness of women’s pick-up lines: Do age and personality matter? Evolutionary Behavioral Sciences, Feb 2022. https://doi.org/10.1037/ebs0000286

Abstract: One way to initiate a conversation for the purposes of mate attraction is to use a pick-up line. While past research has addressed men’s use of pick-up lines, there has been far less research on those used by women. Here, we explored the perceived effectiveness of women’s pick-up lines, particularly with regard to one’s age but also as correlated with their Big Five personality factors. We hypothesized that both men and women would rate the same pick-up lines as effective and that older participants would rate pick-up lines as more effective than younger participants. Our results indicate that women’s use of direct pick-up lines, sharing things in common, asking for a phone number, indirectly hinting at a date, and asking if single were perceived as most effective by both sexes. We did not support our prediction about age. The results demonstrate that of the Big Five dimensions, extraversion in particular is important and was positively correlated with perceived effectiveness.

People are more likely to reveal secrets that violate their own moral values; were more willing to reveal immoral secrets as a form of punishment, and this was explained by feelings of moral outrage

Salerno, J. M., & Slepian, M. L. (2022). Morality, punishment, and revealing other people’s secrets. Journal of Personality and Social Psychology, Feb 2022. https://doi.org/10.1037/pspa0000284

Abstract: Nine studies represent the first investigation into when and why people reveal other people’s secrets. Although people keep their own immoral secrets to avoid being punished, we propose that people will be motivated to reveal others’ secrets to punish them for immoral acts. Experimental and correlational methods converge on the finding that people are more likely to reveal secrets that violate their own moral values. Participants were more willing to reveal immoral secrets as a form of punishment, and this was explained by feelings of moral outrage. Using hypothetical scenarios (Studies 1, 3–6), two controversial events in the news (hackers leaking citizens’ private information; Study 2a–2b), and participants’ behavioral choices to keep or reveal thousands of diverse secrets that they learned in their everyday lives (Studies 7–8), we present the first glimpse into when, how often, and one explanation for why people reveal others’ secrets. We found that theories of self-disclosure do not generalize to others’ secrets: Across diverse methodologies, including real decisions to reveal others’ secrets in everyday life, people reveal others’ secrets as punishment in response to moral outrage elicited from others’ secrets.

Handedness in twins: meta-analyses

Handedness in twins: meta-analyses. Lena Sophie Pfeifer, Judith Schmitz, Marietta Papadatou-Pastou, Jutta Peterburs, Silvia Paracchini & Sebastian Ocklenburg. BMC Psychology volume 10, Article number: 11. Jan 15 2022. https://bmcpsychology.biomedcentral.com/articles/10.1186/s40359-021-00695-3

Abstract

Background: In the general population, 10.6% of people favor their left hand over the right for motor tasks. Previous research suggests higher prevalence of atypical (left-, mixed-, or non-right-) handedness in (i) twins compared to singletons, and in (ii) monozygotic compared to dizygotic twins. Moreover, (iii) studies have shown a higher rate of handedness concordance in monozygotic compared to dizygotic twins, in line with genetic factors playing a role for handedness.

Methods: By means of a systematic review, we identified 59 studies from previous literature and performed three sets of random effects meta-analyses on (i) twin-to-singleton Odds Ratios (21 studies, n = 189,422 individuals) and (ii) monozygotic-to-dizygotic twin Odds Ratios (48 studies, n = 63,295 individuals), both times for prevalence of left-, mixed-, and non-right-handedness. For monozygotic and dizygotic twin pairs we compared (iii) handedness concordance Odds Ratios (44 studies, n = 36,217 twin pairs). We also tested for potential effects of moderating variables, such as sex, age, the method used to assess handedness, and the twins’ zygosity.

Results: We found (i) evidence for higher prevalence of left- (Odds Ratio = 1.40, 95% Confidence Interval = [1.26, 1.57]) and non-right- (Odds Ratio = 1.36, 95% Confidence Interval = [1.22, 1.52]), but not mixed-handedness (Odds Ratio = 1.08, 95% Confidence Interval = [0.52, 2.27]) among twins compared to singletons. We further showed a decrease in Odds Ratios in more recent studies (post-1975: Odds Ratio = 1.30, 95% Confidence Interval = [1.17, 1.45]) compared to earlier studies (pre-1975: Odds Ratio = 1.90, 95% Confidence Interval = [1.59–2.27]). While there was (ii) no difference between monozygotic and dizygotic twins regarding prevalence of left- (Odds Ratio = 0.98, 95% Confidence Interval = [0.89, 1.07]), mixed- (Odds Ratio = 0.96, 95% Confidence Interval = [0.46, 1.99]), or non-right-handedness (Odds Ratio = 1.01, 95% Confidence Interval = [0.91, 1.12]), we found that (iii) handedness concordance was elevated among monozygotic compared to dizygotic twin pairs (Odds Ratio = 1.11, 95% Confidence Interval = [1.06, 1.18]). By means of moderator analyses, we did not find evidence for effects of potentially confounding variables.

Conclusion: We provide the largest and most comprehensive meta-analysis on handedness in twins. Although a raw, unadjusted analysis found a higher prevalence of left- and non-right-, but not mixed-handedness among twins compared to singletons, left-handedness was substantially more prevalent in earlier than in more recent studies. The single large, recent study which included birth weight, Apgar score and gestational age as covariates found no twin-singleton difference in handedness rate, but these covariates could not be included in the present meta-analysis. Together, the secular shift and the influence of covariates probably make it unsafe to conclude that twinning has a genuine relationship to handedness.

Discussion

In three sets of meta-analyses, we examined the influence of twin status and twin zygosity on handedness prevalence and handedness concordance. Our first set of meta-analyses confirmed that in line with Sicotte et al. [10], left-handedness (OR = 1.40, Fig. 3) and non-right-handedness (OR = 1.36, Fig. 5) occur more often among twins than among singletons. Moderator analyses found elevated levels of non-right-handedness among twins to be independent of all variables tested with respect to a potential moderating effect. However, we found that more recent studies reported smaller differences in prevalence of left-handedness between twins and singletons (Fig. 6). To test whether there is a higher left-handedness prevalence in twins compared to singletons in more recent studies at all, we estimated twin-to-singleton ORs for left-handedness for studies published pre and post 1975 separately. With a pre-1975 OR of 1.90 (95% CI = [1.59, 2.27]) and a post-1975 OR of 1.30 (95% CI = [1.17, 1.45]), ORs for more recent studies were smaller, but still indicated a significant twin effect on left-handedness.

Overall, the decrease in twin-to-singleton ORs might either be explained by a decrease in left-handedness in twins or an increase of left-handedness in singletons, or both. As already mentioned, complications occur more often in the course of multiple births [11,12,13], which might contribute to the development of atypical handedness [10]. However, most individual studies included in our meta-analysis did not provide information on pre- or perinatal conditions, so we could not test for a moderating effect of these conditions on the twin-to-singleton OR. Along these lines, future research might have a closer look on the relation between birth complications and handedness.

Assuming that higher proportions of left-handedness among twins might be the by-product of birth complications, a decrease in atypical handedness in twins must be assigned to a decrease in the occurrence of these complications. In fact, it is well conceivable that medical progress over the last decades, that is clearly detectable, e.g. in the United States [92, 93], may have helped to equalize the risks associated with multiple and single births. Such assumptions are supported by a study by Heikkilä et al. [77] who showed differences in left-handedness in twins and singletons to disappear when controlling for birth weight, Apgar score, and gestational age. We therefore tested whether there is evidence for a decrease in left-handedness prevalence in twins (Fig. 6b) by running meta-analyses on left-handedness prevalence in twins and singletons separately while including publication year as a moderator variable. However, while there was no evidence for an effect of publication year on left-handedness prevalence in twins, there seemed to be a trend towards an increase of left-handedness prevalence in singletons (Fig. 6c).

The overall prevalence of atypical handedness in our study was lower than expected. We found 9.13% of twins and 6.97% of singletons to be left-handed (Table 1), while Papadatou-Pastou et al. [3] reported a figure of 10.6% (95% CI 9.71%, 11.50%) for the general population. The low values in our study might be the result of a general effect of publication year in singletons, given that the prevalence of left-handedness has been shown to be higher in younger than in older cohorts [25, 94, 95]. The social stigma associated with left-handedness in the last century [96] may have driven left-handers to conceal their preference in self-reports [97] and to retrain to use their right hand [25, 98]. Most of the studies included in our meta-analysis were published in the previous century and their participants could have been subjected to environmental pressures against left-handedness, leading to underestimation of the true population prevalence of left-handedness. Similarly, we found low overall prevalence of mixed-handedness (3.39% in twins and 2.67% in singletons, Table 1), whereas Papadatou-Pastou et al. [3] gave a point estimate of 9.3% for the general population. This might also be due to an effect of publication year. Moreover, three of five studies that provided data for mixed-handedness classified handedness as writing hand so that data extracted from these studies most likely reflect not mixed-handedness, but ambidexterity, which is much rarer [99].

Our second set of meta-analyses found no difference in the prevalence of atypical handedness between MZ and DZ twins (left-handedness OR = 0.98, mixed-handedness OR = 0.96, non-right-handedness OR = 1.01, Table 3). This result is consistent with the meta-analysis by Sicotte et al. [10] who interpreted this null-effect as indication against mirror imaging theories designed to explain heightened frequencies of left-handers and frequent handedness discordance among MZ twins [100,101,102]. Indeed, it weakens the hypothesis suggesting that the monozygotic twinning process is responsible for atypical handedness [10]. Moreover, it indicates that the overall heightened frequencies of left- and non-right-handers among twins are independent of the twins’ zygosity. A moderator analysis showed that this effect was not influenced by the method used to determine the twins’ zygosity, thus refuting the idea that the result was affected by the accuracy with which twins were classified as monozygotic or dizygotic. All in all, revealing comparable prevalence of atypical handedness for MZ and DZ twins cannot enrichen knowledge about genetic contribution to handedness per se. As already recognized by Sicotte et al. [10], to do so, it is crucial to look at pairwise handedness concordance or discordance of MZ and DZ twin pairs.

Our third set of meta-analyses found a small yet significant effect (OR = 1.11, Fig. 7) for higher handedness concordance among MZ (80.49%) as compared to DZ (79.27%) twins, consistent with the meta-analysis by Sicotte et al. [10]. Even though other publications have demonstrated the occurrence of handedness discordance among MZ twin pairs [100, 101, 103, 104], it was estimated to concern a minority of 20–25% of cases [2]. Stronger phenotypic variation among DZ compared to MZ pairs indicates a certain genetic foundation of that phenotype [2, 26]. Therefore, our results confirm handedness to rely on genetic factors to some extent [10] and are consistent with heritability estimates of 0.24–0.26 [31,32,33]. A moderator analysis suggested that the frequencies of handedness concordance did not differ between studies included in the meta-analysis by Sicotte et al. [10], studies explicitly excluded from Sicotte et al. [10], and more recent studies.

To allow future meta-analyses to perform comparisons on handedness prevalence in twins more specifically (e.g., handedness in male vs. female twins, or handedness in same sex pairs vs. opposite sex pairs), it is desirable that researchers report results broken down for parameters like zygosity, sex, and consider data on birth complications. As this might be beyond the scope of individual papers, we encourage authors to provide open raw data in publicly accessible repositories such as the osf.io.

The present study is not without limitations. We did not investigate relative hand skill but were restricted to hand preference. Measuring hand preference is far more established as compared to assessing relative hand skill, as it is easier and more convenient [105]. Most of the studies included in our meta-analysis only provided information on hand preference, not allowing for an additional analysis for hand skill. Moreover, hand preference and hand skill correlate to some extent [106,107,108], and the distribution of handedness categories overlaps for preference- and skill-related criterions in 90% of the cases [109].

Similarly, our study only dealt with handedness direction in terms of categorial handedness classification which does not take into account the fact that individual handedness can further be defined regarding its strength or its degree. Along these lines, other approaches consider handedness as a continuum, extending the question to how strong or how consistently one hand is preferred, used, or skilled over the other. Indeed, several findings obtained within laterality research on associations between handedness and structural brain lateralization [110] or cognitive performance [111, 112] as well as concerning the genetic foundation of handedness [113, 114] are linked to strength but not direction of handedness. However, since most studies included in the present meta-analyses did not assess handedness in a continuous manner, we were unable to account for handedness strength. Therefore, it falls to future studies to extend their assessment repertoire by measures of handedness strength.

From a methodological point of view, it is further crucial to mention that overall, our moderator analyses are low in power due to the investigated study sample sizes. Of note, in some cases, moderator levels included only three data points calling for an interpretation of these findings with caution.

Meta-analysis: People do not drink alcohol to drown their sorrows, but to indulge in their joys

Dora, Jonas, Marilyn Piccirillo, Katherine T. Foster, Kelly Arbeau, Stephen Armeli, Marc Auriacombe, Bruce D. Bartholow, et al. 2022. “The Daily Association Between Affect and Alcohol Use: A Meta-analysis of Individual Participant Data.” PsyArXiv. February 1. psyarxiv.com/xevct

Abstract: Influential psychological theories hypothesize that people consume alcohol in response to the experience of both negative and positive emotions. Despite two decades of daily diary and ecological momentary assessment research, it remains unclear whether people consume more alcohol on days they experience higher negative and positive affect in everyday life. In this preregistered meta-analysis, we synthesized the evidence for these daily associations between affect and alcohol use. We included individual participant data from 69 studies (N = 12,394), which used daily and momentary surveys to assess affect and the number of alcoholic drinks consumed. Results indicate that people do not drink more often on days they experience high negative affect, but are more likely to drink and drink heavily on days high in positive affect. People self-reporting a motivational tendency to drink-to-cope and drink-to-enhance were estimated to consume more alcohol, but not to consume more alcohol on days they experience higher negative and positive affect. Results were robust across different operationalizations of affect, study designs, study populations, and individual characteristics. Based on our findings, we collectively propose an agenda for future research to explore open questions surrounding affect and alcohol use.

Age, gender, geographical region, belonging to the host country, religious fractionalization, & stereotypic gender roles (proxied by labor force participation rate of women in the athlete’s country) are prominent predictors of crying in the Olympics

Golden tears: A cross-country study of crying in the Olympics. Alex Krumer, Andrew Musau. January 2022. https://www.researchgate.net/publication/358233754_Golden_tears_A_cross-country_study_of_crying_in_the_Olympics

Description: Previous psychological studies on emotional crying have overwhelmingly relied on self-reported data from individuals’ recollections of their own experiences. Apart from the bias that arises from faulty recollection, there is no incentive for an individual to truthfully reveal his or her own experiences in such surveys. In this paper, we address the methodological limitations associated with self-reporting and non-sufficient emotional elicitors, by exploring data on gold medalists of all 450 individual events at the 2012 and 2016 Summer Olympic Games at the end of the medalists’ respective competitions and during the medal ceremonies. We find that age, gender, geographical region, belonging to the host country, religious fractionalization, and stereotypic gender roles (proxied by labor force participation rate of women in the athlete’s home country) are likely to be prominent predictors of crying. Thus, our results suggest that emotional crying is not only a biological feature, but also a cultural phenomenon.

Social acceptance & social anxiety, embarrassment, jealousy, hurt feelings, guilt, & lowered self-esteem: We may do distance ourselves from other people, aggress rejecters, or engage in symbolic efforts to increase subjective acceptance

The relentless pursuit of acceptance and belonging. Mark R. Keary, Shira Gabriel. Advances in Motivation Science, January 31 2022. https://doi.org/10.1016/bs.adms.2021.12.001

Abstract: A great deal of human behavior is motivated by the desire for acceptance and belonging, and a high proportion of people's emotional reactions stems from concerns with actual or potential social rejection. The pervasive quest for acceptance can be seen in the attention and effort people devote to their physical appearance, their efforts to be liked, achievement-related behaviors, conformity, accumulating resources that others need, and generally being the sort of person with whom others want to have social connections. Depending on the context, concerns with social acceptance are typically accompanied by emotions such as social anxiety, embarrassment, jealousy, hurt feelings, and guilt, as well as lowered self-esteem. In addition, people who feel inadequately valued and accepted may behave in ways to increase acceptance, aggress against those who rejected them, distance themselves from other people, and/or engage in symbolic efforts to increase their subjective sense of being accepted. Concerns with acceptance and belonging exert a pervasive, ongoing effect on human thought, behavior, and emotion.

Keywords: BelongingAcceptanceRejectionExclusionOstracismRelational value

COVID-19 state anxiety is linked to everyday cognition and slower processing speed in women, but not men

COVID-19-Related Anxiety and Cognition in Middle-Aged and Older Adults: Examining Sex as a Moderator. Ashley F. Curtis et al. Psychological Reports, January 31, 2022. https://doi.org/10.1177/00332941211064820

Abstract: Aging populations experience disproportionate risk for cognitive decline, which may be exacerbated by coronavirus (COVID-19) illness, particularly among women. This study tested sex as a moderator of associations between COVID-19 state anxiety and cognition in middle-aged/older adults. Adults aged 50+ (N = 275; 151 men/124 women) completed the Coronavirus Anxiety Scale and Cognitive Failures Questionnaire online from remote locations in July/August 2020. A subset of participants (n = 62) completed an objective cognitive task (Stroop). Multiple regressions determined whether sex moderated associations between COVID-19 anxiety and cognitive outcomes. Sex was a significant moderator, such that for women (not men), greater COVID-19 anxiety was associated with more memory failures and blunders (subjective measures) and worse processing speed (objective measure). COVID-19 state anxiety is linked to everyday cognition and processing speed in women, but not men. Consistency across subjective and objective measures promotes the need for sex-specific understanding of the pandemic’s behavioral and cognitive effects in mid-to-late life.

Keywords: Cognition, coronavirus, anxiety, sex differences, middle-aged adults, older adults

37% of the participants contacted other persons because they dreamed about them; dream recall frequency, attitude towards dreaming, younger age, and female gender was associated with contacting the person(s) dreamed of

The Frequency of Contacting Persons you Dreamed About: A Social Aspect of Dreaming. Michael Schredl, Anja S. Göritz. Imagination, Cognition and Personality, January 31, 2022. https://doi.org/10.1177/02762366221077631

Abstract: Although dreams are very private, dreaming has also social components, i.e., dreams are shared quite often. We studied the frequency of how often the dreamer deliberately contacted another person because s/he dreamed about this person, as this might intensify the waking-life bonds with this person. Overall, 2929 participants completed the dream survey, and a subsample also completed a Big Five Personality inventory. The findings indicate that 37% of the participants contacted other persons because they dreamed about them. Dream recall frequency, attitude towards dreaming, younger age, and female gender was associated with contacting the person(s) dreamed of. Moreover, extraversion was also related to the frequency of contacting the person(s) dreamed of – similar to the relationship found for dream sharing frequency and extraversion. However, the association with low conscientiousness is a new finding. It would be very interesting to test whether this social behavior (contacting another person) motivated by dreams strengthens the social bonds between the dreamer and the contacted person(s) and thereby provide support for the Social Simulation Theory.

Keywords: social aspects of dreaming, dream recall frequency, attitude towards dreaming, extraversion, conscientiousness

A Free-Market Environmentalist Transition toward Renewable Energy: The Cases of Germany, Denmark, and the United Kingdom

A Free-Market Environmentalist Transition toward Renewable Energy: The Cases of Germany, Denmark, and the United Kingdom. William Hongsong Wang, Vicente Moreno-Casas, Jesús Huerta de Soto. Energies 2021, 14(15), 4659; July 31 2021. https://doi.org/10.3390/en14154659

Abstract: Renewable energy (RE) is one of the most popular public policy orientations worldwide. Compared to some other countries and continents, Europe has gained an early awareness of energy and environmental problems in general. At the theoretical level, free-market environmentalism indicates that based on the principle of private property rights, with fewer state interventionist and regulation policies, entrepreneurs, as the driving force of the market economy, can provide better services to meet the necessity of offering RE to protect the environment more effectively. Previous studies have revealed that Germany, Denmark, and the United Kingdom have made some progress in using the market to develop RE. However, this research did not analyze the three countries’ RE conditions from the perspective of free-market environmentalism. Based on our review of the principles of free-market environmentalism, this paper originally provides an empirical study of how Germany, Denmark, and the United Kingdom have partly conducted free-market-oriented policies to successfully achieve their policy goal of RE since the 1990s on a practical level. In particular, compared with Germany and Denmark, the UK has maintained a relatively low energy tax rate and opted for more pro-market measures since the Hayekian-Thatcherism free-market reform of 1979. The paper also discovers that Fredrich A. Hayek’s theories have strongly impacted its energy liberalization reform agenda since then. Low taxes on the energy industry and electricity have alleviated the burden on the electricity enterprises and consumers in the UK. Moreover, the empirical results above show that the energy enterprises play essential roles in providing better and more affordable RE for household and industrial users in the three sampled countries. Based on the above results, the paper also warns that state intervention policies such as taxation, state subsidies, and industrial access restrictions can impede these three countries’ RE targets. Additionally, our research provides reform agendas and policy suggestions to policymakers on the importance of implementing free-market environmentalism to provide more efficient RE in the post-COVID-19 era.

Keywords: free-market environmentalism; renewable energy; entrepreneurship; public policy; Germany; Denmark; United Kingdom; European Union; EU Green Deal; energy transition; energy production; electricity prices; taxation; state subsidies; industrial access restriction; decision-making; political economy

5. Conclusions

Based on the review of the theoretical principles of free-market environmentalism, this paper has originally provided an empirical study of how Germany, Denmark, and the UK partly conduct free-market-oriented policies to successfully achieve their policy goal of broader use of RE since the 1990s.

The paper’s empirical results show that in 28 years, from 1990 to 2018, all three countries have shown positive features in their respective RE transitions. This tendency is especially evident for the increasing trend in the share of RE in gross electricity production and gross available energy and the decreasing trend in GHG emissions. However, as the supply of RE increased, the prices of electricity in the three countries did not show the same downward trend. This result alters the traditional view on these countries’ energy transitions, with the UK being more successful in a critical aspect of any energy transition: affordability.

Simultaneously, by measuring the specific data on taxation, state subsidies, and industrial access restrictions in the three sampled countries, we pointed out how these interventionist and regulation policies have caused damage to the three countries’ RE transition goals. Given free-market environmentalism, the cases of Germany and Denmark serve to illustrate how vital the entrepreneurship-based bottom-up forces (led by organizations and entrepreneurs in the form of RE cooperatives) are for the relative success of an energy transition. The German experience emphasizes political decentralization for decision-making and a certain freedom in the RE market. Inside this framework, a wide range of decentralized initiatives still thrive. This policy is the reason for the country’s energy transition success. However, there are distorting effects of government intervention, such as high electricity prices. They are caused by taxes, subsidies, and industry access restrictions. In general, Germany’s energy prices are not entirely market-oriented but are taxed and subsidized by the German government. As we have pointed out above, Germany’s energy prices are artificially high due to the FIT system. Therefore, Germany cannot be considered an ideal sample of free-market environmentalism. As previous research indicated, we also suggest Germany reduce the degrees of the above three interventionist policies as best as possible to enhance RE production and reduce electricity and RE prices.

Like the German case, the Danish energy policy has not wholly followed the principles of free-market environmentalism due to taxes, subsidies, and industry access restrictions. Denmark’s high electricity prices are due to high production costs and high taxes. As a result, Denmark faces a tough challenge to achieve an efficient and affordable RE transition concerning electricity prices. As previous research indicated, we also suggest Denmark should conduct tax reduction for its RE industry and eliminate state subsidies and industry access restrictions. However, despite the above policy deficiencies, Denmark is managing a RE transition due to the essential roles of decentralized local organizations and entrepreneurial activities. Moreover, more market-based RE innovation has created more jobs and reduced more GHG emissions since 1990. Even the literature that was not in favor of free-market environmentalism also acknowledged the Danish success in RE transition and its community and entrepreneurship-based characters [23].

On the other hand, compared with Germany and Denmark, the UK has maintained a relatively low energy tax rate and opted for more pro-market measures since the Hayekian-Thatcherism free-market reform of 1979. Fredrich A. Hayek’s theories have strongly impacted its energy liberalization reform agenda since then. Low taxes on the energy industry and electricity have alleviated the burden on electricity enterprises and consumers. Electricity prices have remained relatively low since 1990. However, interventionist policies such as state-regulated auctions and industry access restrictions have obstructed its energy transition. Moreover, RE policies are not as decentralized as Germany and Denmark, although RE innovation has increased in the three countries. Despite not having a purely free-market environmentalist energy policy, the UK has come closer to free-market environmentalism than the other two countries. Contrary to what some literature posits, the UK is achieving energy transition at a good pace, even beating Germany and Denmark by containing the rise in electricity prices. Therefore, with less intervention in the future, a better conducted RE market process could provide better conditions for British RE development.

Thus, during the post-COVID-19 era, to attain economic recovery and achieve a more advanced level of RE and protect the environment, it is essential to respect the principles of private property rights and free-market price coordination to acquire more and better RE. Hence, EU policymakers should adopt its RE policy from the perspective of free-market environmentalism to conduct better entrepreneurship for RE. Government RE’s intervention-regulation policies such as taxation, subsidies, and industry restrictions infringe on private property rights and cause economic discoordination and zero-sum games. Moreover, although the UK has not been an EU member since Brexit, its precious and successful experience of energy liberalization since the 1979 Hayekian-Thatcherism free-market energy reform could help other European countries to achieve better RE production and affordable energy prices. The UK experience and the free-market environmentalist policies that Germany and Denmark conduct could help other countries globally. Additionally, the empirical results in this paper show that the result of free-market environmentalism should be implemented over a long period. Policymakers should perceive that the free-market environmentalist policy approach and the entrepreneurial production of RE take time. Any interventionist eager for quick success may reverse the policy results. Hence, respecting entrepreneurship and reducing state intervention or regulation as much as possible is what global policymakers should execute during the post-COVID-19 era for a better energy transition.

Girls learn faster than boys when school is out (in both reading and math), but this advantage is completely eliminated when school is in session; schools act as a relatively standardizing institution, producing more similar patterns in learning

Schools as a Relatively Standardizing Institution: The Case of Gender Gaps in Cognitive Skills. Douglas B. Downey, Megan Kuhfeld, Margriet van Hek. Sociology of Education, January 27, 2022. https://doi.org/10.1177/00380407211070319

Abstract: Growing evidence suggests that contrary to popular belief, schools mostly do not generate achievement gaps in cognitive skills but, rather, reflect the inequalities that already exist. In the case of socioeconomic status, exposure to school often reduces gaps. Surprisingly little is known, however, about whether this pattern extends to gender gaps in cognitive skills. We compare how gender gaps in math and reading change when children are in school versus out (in the summer) among over 900,000 U.S. children. We find that girls learn faster than boys when school is out (in both reading and math), but this advantage is completely eliminated when school is in session. Compared to the family environment, schools act as a relatively standardizing institution, producing more similar gendered patterns in learning.

Keywords: quantitative research on education, summer setback, gender, school effects, standardized testing

Both facemasks and makeup tend to result in over-estimation of the young women's age compared to neutral faces, but the combination of both is not additive: 4 years on average

Your ID, please? The effect of Facemasks and Makeup on Perceptions of Age of Young Adult Female Faces. H. Davis, J. Attard-Johnson. Applied Cognitive Psychology, January 28 2022. https://doi.org/10.1002/acp.3923

Abstract: During the COVID-19 pandemic, wearing facemasks was mandatory in the United Kingdom except for individuals with medical exemptions. Facemasks cover the full lower half of the face, however the effect of facemasks on age perception is not yet known. The present study examined whether age estimation accuracy of unfamiliar young adult women is impaired when the target is wearing a facemask. This study also examined whether makeup, which has previously been shown to increase error bias, further impairs age estimation accuracy when paired with a facemask. The findings indicate that both facemasks and makeup tend to result in over-estimation of the young women's age compared to neutral faces, but the combination of both is not additive. Individual level analysis also revealed large individual differences in age estimation accuracy ranging from estimates within 1 year of the target's actual age, and age estimates which deviated by up to 20 years.

Does the Mafia Hire Good Accountants?

Bianchi, Pietro A. and Bianchi, Pietro A. and Francis, Jere R. and Marra, Antonio and Pecchiari, Nicola, Does the Mafia Hire Good Accountants? (November 5, 2021). SSRN: http://dx.doi.org/10.2139/ssrn.3957650

Abstract: We investigate if organized crime groups (OCG) are able to hire good accountants. We use data about criminal records to identify Italian accountants with connections to OCG. While the work accountants do for the OCG ecosystem is not observable, we can determine if OCG hire “good” accountants by assessing the overall quality of their work as external monitors of legal businesses. We find that firms serviced by accountants with OCG connections have higher quality audited financial statements compared to a control group of firms serviced by accountants with no OCG connections. The findings provide evidence OCG are able to hire good accountants, despite the downside risk of OCG associations. Results are robust to controls for self-selection, for other determinants of auditor expertise, direct connections of directors and shareholders to OCG, and corporate governance mechanisms that might influence auditor choice and audit quality.

Keywords: accountant connections to organized crime, accountant criminal record, criminal investigations, financial reporting quality

JEL Classification: G31,G32,G38, K42, K49

Rodent-hunting cat ownership in childhood was associated with higher psychotic experience scores in male participants, but not in female participants

Conditional associations between childhood cat ownership and psychotic experiences in adulthood: A retrospective study. Vincent Paquin et al. Journal of Psychiatric Research, Jan 30 2022. https://doi.org/10.1016/j.jpsychires.2022.01.058

Abstract: Ownership of cats in childhood has been inconsistently associated with psychosis in adulthood. Parasitic exposure, the putative mechanism of this association, may be more common with rodent-hunting cats, and its association with psychosis may depend on other environmental exposures. We examined the conditional associations between childhood cat ownership and the frequency of psychotic experiences in adulthood. Adults (n = 2206) were recruited in downtown Montreal to complete a survey about childhood cat ownership (non-hunting or rodent-hunting), winter birth, residential moves in childhood, head trauma history, and tobacco smoking. The frequency of psychotic experiences (PE) was measured with the 15-item positive subscale of the Community Assessment of Psychic Experiences. Associations between exposures and PE were examined in linear regressions adjusted for age and sex. Interactions among variables were explored using a conditional inference tree. Rodent-hunting cat ownership was associated with higher PE scores in male participants (vs. non-hunting or no cat ownership: SMD = 0.57; 95% CI: 0.27, 0.86), but not in female participants (SMD = 0.10; 95% CI: −0.18, 0.38). In the conditional inference tree, the highest mean PE score was in the class comprised of non-smokers with >1 residential move, head trauma history, and rodent-hunting cat ownership (n = 22; mean standard score = 0.96). The interaction between rodent-hunting cat ownership and head trauma history was supported by a post-hoc linear regression model. Our findings suggest childhood cat ownership has conditional associations with psychotic experiences in adulthood.

Keywords: Psychotic disordersToxoplasmaMachine learningCraniocerebral trauma