The cartesian folk theater: People conceptualize consciousness as a spatio-temporally localized process in the human brain

Forstmann, M., & Burgmer, P. (2021). The cartesian folk theater: People conceptualize consciousness as a spatio-temporally localized process in the human brain. Journal of Experimental Psychology: General. Dec 2021. https://doi.org/10.1037/xge0001108

Abstract: The present research (total N = 2,057) tested whether people’s folk conception of consciousness aligns with the notion of a “Cartesian Theater” (Dennett, 1991). More precisely, we tested the hypotheses that people believe that consciousness happens in a single, confined area (vs. multiple dispersed areas) in the human brain, and that it (partly) happens after the brain finished analyzing all available information. Further, we investigated how these beliefs are related to participants’ neuroscientific knowledge as well as their reliance on intuition, and which rationale they use to explain their responses. Using a computer-administered drawing task, we found that participants located consciousness, but not unrelated neurological processes (Studies 1a and 1b) or unconscious thinking (Study 2) in a single, confined area in the prefrontal cortex, and that they considered most of the brain not involved in consciousness. Participants mostly relied on their intuitions when responding, and they were not affected by prior knowledge about the brain. Additionally, they considered the conscious experience of sensory stimuli to happen in a spatially more confined area than the corresponding computational analysis of these stimuli (Study 3). Furthermore, participants’ explicit beliefs about spatial and temporal localization of consciousness (i.e., consciousness happening after the computational analysis of sensory information is completed) are independent, yet positively correlated beliefs (Study 4). Using a more elaborate measure for temporal localization of conscious experience, our final study confirmed that people believe consciousness to partly happen even after information processing is done (Study 5).

Content in which emotions are more prevalent than argument quality is more likely to be shared; content in which positive emotions are more prevalent than negative emotions is more likely to be shared

What makes people share political content on social media? The role of emotion, authority and ideology, Jason Weismueller et al. Computers in Human Behavior, December 20 2021, 107150. https://doi.org/10.1016/j.chb.2021.107150

Highlights

• Emotionality is more important than argument quality in fostering user engagement.

• Positive political content receives more engagement than negative content.

• Ideological extreme users are less likely to engage with positive content.

• Politicians may use influential users in the political sphere for political campaigning.

• Social media platforms should emphasize a greater focus on critical thinking.

Abstract: In this paper, we examine which content characteristics lead to increased sharing of political information on social media, and which role political ideology has in user sharing behavior. More specifically, we investigate the impact of emotions and authority on sharing, as well as the moderating role of political extremity of social media users. We analyzed 10,141 political tweets, sent by 527 influencers between July 2019 and June 2020. The results reveal that content in which emotions are more prevalent than argument quality is more likely to be shared than content in which argument quality is prevalent. Perhaps surprisingly, we also show that content in which positive emotions are more prevalent than negative emotions is more likely to be shared than content in which negative emotions are prevalent. Moreover, authority (i.e., a dominant language style and a high number of followers) can lead to increased shares. Finally, we find that content in which positive emotions are more prevalent than negative emotions is less effective in increasing shares when users are located at the ideological extreme compared to the ideological center. On the one hand, we provide insights into how influencers in social media networks can be utilized for political campaigning. On the other hand, we provide insights into what makes users engage with political content from influencers that might contribute to political polarization on social media.

Keywords: InfluencersUS PoliticsSharingIdeologySocial network analysisTwitter

People form face impressions based on a conceptual understanding of personality structure that they have come to learn from their regional environment

Personality across world regions predicts variability in the structure of face impressions. DongWon Oh, Jared D. Martin, and Jonathan B. Freeman. Psychological Science, accepted. Dec 2021. https://files.cargocollective.com/c860495/OhMartinFreeman_PersonalityAcross.pdf

Abstract: Research on face impressions has often focused on a fixed and universal architecture, treating  regional variability as noise. Here, we demonstrate a crucial yet neglected role of cultural  learning processes in forming face impressions. In Study 1, we found that variability in the  structure of perceivers’ face impressions across 42 world regions (n=287,178) could be  explained by variability in the actual personality structure of people living in those regions. In  Study 2, data from 232 world regions (n=307,136) revealed that perceivers use the actual  personality structure learned from their local environment to form lay beliefs about personality,  which in turn scaffold the structure of perceivers’ face impressions. Together, these results  suggest that people form face impressions based on a conceptual understanding of personality  structure that they have come to learn from their regional environment. The findings call for greater attention on the regional and cultural specificity of face impressions.

Keywords: person perception, face processing, social cognition, semantic memory, cultural psychology

Adolescent close friendship quality was a significantly better predictor of adult peer and romantic outcomes, work performance, and depressive symptoms than parental reports of the parent–teen relationship

When friendships surpass parental relationships as predictors of long-term outcomes: Adolescent relationship qualities and adult psychosocial functioning. Joseph P. Allen, Meghan Costello, Jessica Kansky, Emily L. Loeb. Child Development, December 6 2021. https://doi.org/10.1111/cdev.13713

Abstract: Perceptions of adolescent–parent and adolescent–peer relationship qualities, and adolescents’ attachment states of mind were examined as predictors of adult social and romantic relationship quality, depressive symptoms, and work performance. Adolescents (86 male, 98 female; 58% White, 29% African American, 8% mixed race/ethnicity, 5% other groups) were followed from age 13 to 24 via observational, self-, parent-, and close friend-reports. Adolescent close friendship quality was a significantly better predictor of adult peer and romantic outcomes, work performance, and depressive symptoms than parental reports of the parent–teen relationship; attachment security was also a strong predictor of numerous outcomes. Results are interpreted as reflecting the difficulty for parents judging parent–teen relationship quality and as reflecting the growing importance of close friendships during this period.

Assessment of Romantic Relationship Quality

Ribotta, B., Silan, M. A., Dujols, O., Bellemin, R., & IJzerman, H. (2021, December 15). Lack of Construct Validity and Item-Content Overlap in the Assessment of Romantic Relationship Quality. https://doi.org/10.31234/osf.io/w32dc

Abstract: Central to interventions to improve the quality of romantic relationships is its measurement. Yet, to what degree is the concept of relationship quality well-defined, and, importantly, well-measured? In the present article, the authors conducted a comprehensive search of instruments measuring relationship quality in ProQuest, Web of Science, and Scopus finding a total of 599 scales, with 26 meeting our definition of romantic relationship quality. When the authors investigated the 26 scales’ overlap of item-content, they identified 25 distinct categories among 754 items (with our database of items on the OSF: https://osf.io/v964p/). The mean overlap between scales was weak (Jaccard Index correlation coefficient = 0.39), indicating that these scales were very heterogeneous. The authors then assessed to what extent researchers reported internal validity in 43 scale development-validation articles. They found that Cronbach’s Alpha was most often reported (in 91% of the articles). Other aspects were reported far less often, with 55% reporting exploratory factor analyses, 26% reporting confirmatory factor analyses, 23% reporting test-retest reliability, 7% reporting measurement invariance. The heterogeneity of measures and lack of reported general validity of romantic relationship quality points to the need for concept-driven work on the assessment of romantic relationship quality.

Fifty-nation study: Values better predict alcohol consumption; traits better predict obesity

Using Public Datasets to Understand the Psychological Correlates of Smoking, Alcohol Consumption, and Obesity: A Country-Level Analysis. Paul H. P. Hanel, Sara M. G. da Silva, Richard A. Inman. Cross-Cultural Research, December 16, 2021. https://doi.org/10.1177/10693971211062130

Abstract: In the present research, we investigate whether cultural value orientations (CVOs) and aggregate personality traits (Big-5) predict actual levels of alcohol consumption, smoking, and obesity across 50 countries using averages derived from millions of data points. Aggregate traits explained variance above and beyond CVOs in obesity (particularly neuroticism and extraversion), while CVOs explained variance beyond aggregate traits in alcohol consumption (particularly harmony and hierarchy). Smoking was not linked to aggregated traits or CVOs. We conclude that an understanding of the cultural correlates of risky health behaviors may help inform important policies and interventions for meeting international sustainable development goals.

Keywords: public data, smoking, obesity, alcohol, health, personality traits, cultural value orientations

Discussion

Few studies have investigated the psychological predictors of risky health behaviors at an aggregated country level. The present study addressed this gap in the literature by obtaining reliable estimates of health and psychological variables from big publicly available datasets comprising millions of individuals, and using them to test theoretical predictions.

How Do Country-Level Values and Traits Relate to Risky Health Behaviors?

Cultural values: A recent study using similar datasets has demonstrated that cultural values show a particular pattern of association with alcohol consumption across countries (Inman et al., 2017). Specifically, alcohol consumption was greater in countries that value harmony and autonomy, and lower in countries that value embeddedness and hierarchy. Given that the present study used the same data for cultural values, it was unsurprising that the partial correlations in the present study replicated those of Inman et al. Specifically, significant correlations were observed for harmony (positive) and embeddedness (negative), although the effect sizes were small.

Beyond alcohol, the present study was interested in how values would be associated with smoking and obesity. The pattern of partial correlations for these health indicators suggested some similarity with alcohol consumption. For example, the direction of the associations between alcohol, smoking, and obesity were the same for hierarchy (negative) and mastery (negative). There were, however, some clear differences. Alcohol and smoking were positively correlated with harmony, but obesity appeared to be unrelated. Inman et al. (2017) explained that harmony may be positively correlated to alcohol consumption at the country level because cultures high in harmony regulate how their members relate to the social world via an emphasis on appreciation and “fitting in” (Schwartz, 2006). Such an emphasis may promote “having a good time” as a social motive and thus encourage individuals to engage in risky social behaviors such as drinking, smoking, and illicit drug use. In contrast, obesity may be unrelated to harmony values as its associated risky behaviors are less social in nature.

A second finding was that hierarchy was negatively associated with alcohol consumption. On the other hand, obesity appeared unrelated to embeddedness, and smoking had a positive correlation. Cultures that value hierarchy emphasize responsible behavior in line with rules assigned to their respective roles (Schwartz, 2006). Alcohol has long been considered a threat to public order (Mold, 2018), and contemporary evidence links alcohol consumption to socially undesirable behaviors and health problems (World Health Organization, 2014), both of which are threatening hierarchies. Smoking and obesity, on the other hand, are not linked to disinhibited social behaviors in the same manner as alcohol (e.g., intoxicated behavior) and thus may not be considered as threatening to authorities.

Finally, egalitarianism had a significant negative association with smoking but was unrelated to alcohol, and obesity. This can be understood by considering that egalitarian cultures socialize their populations to feel concern for everyone’s welfare and to act for the benefit of others (Schwartz, 2006). Smoking may be negatively related to egalitarianism because it is a behavior that presents a risk to others, via secondhand smoke, as well as the individual. Indeed, there are a wide range of risks associated with passive smoking including heart disease, stroke and cancer (U.S. Department of Health and Human Services, 2006), and studies within individual countries, such as the U.S.A, have shown that a large proportion of people perceive secondhand smoke as being harmful (Kruger et al., 2016). In short, egalitarian populations may be less likely to smoke because their members try and act in a manner that does not risk the health of others.

Big-5 traits: The study expands on Inman et al. (2017), Mackenbach (2014) and others by also considering country-level aggregates of personality traits. Firstly, it was evident that neither alcohol consumption nor smoking was linked to aggregate personality. Partial correlations did, however, hint that countries with high aggregated scores for openness to new experiences had increased alcohol consumption (although this correlation fell short of being statistically significant, p = .052).

Unlike smoking and alcohol, obesity did present a clear pattern of associations with aggregate personality traits. Specifically, obesity had a strong positive association with extraversion, and a moderate negative association with neuroticism. These findings add to a growing body of evidence that links extraversion to obesity at a country level (McCrae & Terracciano, 2008) and concur with those of several studies that have linked extraversion to increased BMI (Armon et al., 2013; Kakizaki et al., 2008). A clear question that emerges from these results is: why is a personality trait linked to descriptors such as “outgoing” and “energetic” linked to increased obesity? Indeed, some studies at the individual level have linked extraversion to healthier eating habits (Mõttus et al., 2012). To account for this, some authors have argued that the positive mood state linked to high extraversion leads individuals to perceive themselves as less vulnerable to negative health conditions and thus to engage in behaviors, such as overeating, that can lead to obesity (Grant & Schwartz, 2011).

Interestingly, our findings only partly replicate those on an individual level. For example, we found that harmony is positively associated with alcohol consumption, whereas Rudnev & Vauclair (2018) have not found a significant relation on an individual level; we found no association between conscientiousness and obesity, whereas a range of other studies found a negative association (e.g., Allen et al., 2015; Gerlach et al., 2015; Kim, 2016; cf. Table 1); we found a positive association between obesity and extraversion which is in line with the literature (e.g., Kim, 2016; Mõttus et al., 2012); however, we also found a negative association between neuroticism and obesity, whereas other studies either found no or positive associations (Kim, 2016; Mõttus et al., 2012).

We do not perceive a significant finding to be conflicting with a non-significant one because effect sizes can vary across studies: Assuming a statistical power of <1 (in many cases, the power is clearly below <.80; Brysbaert, 2019), a mix of significant and non-significant findings is expected (Lakens & Etz, 2017). Thus, our findings were mostly in line with the literature. However, the negative association between neuroticism and obesity requires further explanation because some previous research found positive associations between obesity and neuroticism (whereas some others found no association, cf. Table 1). This might indicate to an ecological fallacy: The pattern of association is reversed on the aggregated level as opposed to an individual level. Alternatively, neuroticism might have a different meaning on a country level than on an individual level. The effects of a neurotic person might be different than those of a neurotic large group of people (here: country). Future research is needed to explore this possibility. Importantly, since our findings are overall consistent with the literature, it is unlikely that the ecological fallacy is an issue.

Which Is a Better Predictor of Country-Level Risky Health Behaviors: Values or Traits?

The present study tested theoretical predictions regarding the relative importance of value and traits for understanding risky health behaviors. Our finding was that values and traits were differentially important for different behaviors. In line with our predictions, cultural values were a better predictor of alcohol consumption than traits. Alcohol consumption has always been rooted in a social context and in many societies (excluding “abstinent” societies that expressly forbid alcohol consumption for religious reasons; Room & Mäkelä, 2000) alcohol consumption is a common occurrence at social events (Galea et al., 2004). In other words, drinking alcohol is a social behavior. Because values are more important for guiding social interactions than traits (Boer et al., 2011), they were also the better predictors.

Also in line with our predictions, B5-traits were a better predictor of obesity than cultural values. Obesity can be a result of by poor eating habits and a lack of physical exercise (Prentice & Jebb, 1995). In other words, it is caused by behavior that lies in the past. Thus, obesity is conceptually closer to traits, which measure how a person is in the present (Saucier, 1994), in contrast to values, which are better able to capture future behavior (Eyal et al., 2009).

Finally, the results did not support our third hypothesis that values explain variance beyond traits in smoking. Initially, we predicted that values would be better at explaining smoking than traits because values are more relevant for social interactions (Boer et al., 2011). However, in retrospect, we believe that smoking might have a weaker social component than alcohol consumption. Indeed, the number of cigarettes daily smokers consume on average per hour varies little between 10 a.m. and midnight (Shiffman et al., 2014). If smoking was mostly social, it would be higher in the late afternoons and evenings when people are more likely to be in social situations. Note however that our data does not allow us to distinguish between social smokers and “full-time” smokers. We assume that values are better predictors for social smokers, a prediction that can be investigated by future research.

Limitations

One potential limitation pertains to differences in sample types across the measures. While smoking, obesity, and alcohol consumption were based on official representative data, not all of our traits and values data was based on representative samples. However, the value importance and structure remains mainly the same across sample types such as representative, student, or teacher samples (Hanel et al., 2018; Schwartz & Bardi, 2001), indicating that the sample type barely matters.

Another possible limitation pertains to the sample size of only 50 countries. However, the term “sample size” is misleading here: The numerical value of each country for each variable consists of hundreds to thousands of participants (traits and values) or even millions (smoking, obesity, and alcohol consumption), making our analysis very robust. Moreover, a sample of 50 countries is more representative of the total “population” of around 200 countries than, for example, a sample of even 1,000,000 Americans to the total US population of around 300, 000, 000. Finally, with 50 countries, we included more countries than many previous studies which often included 20–30 countries (see Introduction, for example). It is important to acknowledge, however, that countries from geographical regions other than Europe, and particularly the East Mediterranean and Africa regions, were underrepresented in our sample.

Finally, the trait data we used were measured with two different questionnaires, the NEO-PI-R (McCrae, 2001) and the BFI (Schmitt et al., 2007), which show on a country level relatively low convergence, rs ≤ .45 (Schmitt et al., 2007). However, both trait measures are reliable and valid, which makes it unlikely that the combination of trait measures impacted the results.

Implications

A current UN goal for sustainable development by 2030 includes ensuring healthy lives and well-being for all at all ages (United Nations General, 2015). This includes specifically, reducing by one-third premature mortality from noncommunicable diseases through prevention and treatment and promoting well-being. This study adds to a growing body of research that suggests information about cultural-level psychological characteristics, including dimensions and profiles of cultural values and aggregate personality, may be useful for informing policies and interventions aimed at meeting these goals. Campaigns promoting healthy behaviors, for example, may be differentially effective across populations with distinct cultural values or personality characteristics. Future research is, however, required to further understand the causal mechanisms between country-level psychological characteristics and risky health behaviors.

Many publicly available datasets, and particularly those including health-related variables, have data for most countries. Unfortunately, datasets including national indices of psychological variables typically have smaller samples. Moreover, while national health indicators are abundant and easily accessible, it is currently more difficult to find and obtain national indices of psychological variables. The present study demonstrates that public datasets can be useful to researchers who wish to test theoretical predictions about country-level psychological characteristics and their relations to indicators of health or well-being. Given that such research findings may have important implications for meeting international goals for sustainable development (e.g., the 2030 Agenda for Sustainable Development), a clear implication of our study is that an effort is required to construct public datasets that outline the psychological characteristics of all countries globally.

Monkeys vs Dogs: It is claimed that over 200 puppies were dropped to their deaths by vengeful simians... Hyenas can also show this avenging behavior...

Monkeys vs Dogs: Over 200 puppies dropped to their deaths by vengeful simians. Pritha Paul. MEAWW Dec 18 2021. https://meaww.com/horrifying-monkey-vs-dog-war-over-200-puppies-dropped-to-their-deaths-by-angry-simians

After a few dogs killed an infant monkey a month ago, the angry monkeys have been snatching up pups to drop them from a height to their grisly deaths

A blood-thirsty gang of monkeys are waging a war with dogs in a small village in India. The village's canine population is being terrorized by the group of primates after a few dogs killed an infant monkey.

The monkeys' "revenge" saw around 250 dogs being dragged and dropped from the tops of buildings and trees. Not a single dog has survived the purge by the raging primates. All of this has been going down in Maharashtra’s Beed district, about 300 miles east of Mumbai, in the nearby Lavool village. The killing began a month ago after a few dogs killed a monkey's baby, the villagers told News 18. The moment a dog is spotted, the simians snatch up the pups, drag them somewhere high to drop them to their deaths. 

Video captured by the outlet showed a tiny dog in the clutches of a primate near the edge of a building. Residents contacted forest department officials to catch the monkeys after all of the dogs were killed in the village. But in Lavool, which has a population of about 5,000, the officials weren’t able to catch a single monkey, when they tried, the outlet reported. Some have even been attacked. 

When all else failed, the villagers took it upon themselves to take action and tried to tackle the monkey problem. However, the simians then turned their sights on the people as they tried to rescue the dogs. As a result, some have been injured after falling from buildings while trying to save the dogs, the outlet said. The monkeys still haven’t stopped and are now targeting small children en route to school, the outlet said. 

According to Stephanie Poindexter, an assistant professor at SUNY Buffalo whose research focuses on primate behavioral ecology, monkeys can take revenge. "We've seen that when an individual is attacked in some way, the likelihood of them attacking someone related to their aggressor is higher," Poindexter told Gizmodo. "Typically there's a preference for attacking a third-party associated with the original aggressor, as opposed to the actual aggressor... for the most part, these acts of 'revenge' take place shortly after the attack." Poindexter also explained that hyenas also have been known to seek revenge by hurting the aggressor's relatives instead of the actual aggressor.

Other instances of monkey rage

This is not the only instance of monkeys taking revenge. A wild monkey captured a puppy and held it hostage at the top of a tree for three days in Malaysia. The macaque reportedly kidnapped the puppy when it was two weeks old. 

Some locals have also complained about the monkeys raiding their pantries, snatching clothes, and going through fridges. The increasing number of complaints led to Malaysia's Department of Wildlife and National Parks begin mass cullings of thousands of macaques a year.

Psilocybin microdosing: In a pre-registered, double-blind, placebo-controlled, within-subject crossover design study, they found not affect emotion processing or symptoms of anxiety and depression compared with placebo

Psilocybin microdosing does not affect emotion-related symptoms and processing: A preregistered field and lab-based study. Josephine Marschall et al. Journal of Psychopharmacology, December 17, 2021. https://doi.org/10.1177/02698811211050556

Abstract

Background: Microdoses of psychedelics (i.e. a sub-hallucinogenic dose taken every third day) can reduce symptoms of depression, anxiety and stress according to anecdotal reports and observational studies. Research with medium to high doses of psilocybin points towards potential underlying mechanisms, including the modulation of emotion and interoceptive processing.

Aims: In this preregistered study, we investigated whether psilocybin microdoses alter self-reported interoceptive awareness and whether repeated microdosing over 3 weeks modulates emotion processing and reduces symptoms of anxiety and depression.

Methods: We used a double-blind, placebo-controlled, within-subject crossover design. Participants completed the Multidimensional Assessment of Interoceptive Awareness Questionnaire 1½ h after self-administering their second dose (or placebo), and the emotional go/no-go task and the shortened Depression Anxiety Stress Scale 1½ h after self-administering their seventh dose.

Results: Our confirmatory analyses revealed that psilocybin microdosing did not affect emotion processing or symptoms of anxiety and depression compared with placebo. Our exploratory analyses revealed that psilocybin microdosing did not affect self-reported interoceptive awareness, that symptoms of depression and stress were significantly reduced in the first block compared with baseline, that participants broke blind in the second block and that there was no effect of expectations. Further research in a substance-naïve population with clinical range anxiety and depressive symptoms is needed to substantiate the potential beneficial effects of microdosing.

Keywords: Psilocybin, microdosing, psychedelics, emotion processing, interoceptive awareness, anxiety, depression, symptoms

Discussion

We conducted this study to investigate the effect of repeated psilocybin microdosing on depression and anxiety symptoms, emotion processing and interoceptive awareness. We hypothesized that psilocybin microdosing would reduce symptoms of anxiety and depression, increase the processing time needed to identify negative emotions and increase interoceptive awareness. Our results suggest that the psilocybin microdose did not affect interoceptive awareness, but that there was an effect of the block-order variable. In block 1, the psilocybin-first block-order group had a lower average on two subscales scores of the MAIA compared with the Placebo-first block-order group, but this difference was no longer significant in block 2. We explored the possibility that the psilocybin-first block-order group’s interoceptive awareness increased due to repeated psilocybin microdosing after block 1 and therefore achieved higher scores in block 2 which were more similar to the placebo-first group. However, although there was an increase in average score, this change was not significant. It could well be that the block-order groups already differed in interoceptive awareness at baseline and became more similar in their scores over time regardless of condition assignment – however as we did not assess baseline scores on interoceptive awareness, this possibility cannot be verified.

The effect of repeated microdosing on emotion processing, as measured using an emotion go/no-go task, and symptoms of anxiety, depression and stress also did not differ from placebo. Our finding that psilocybin microdosing does not affect symptoms of anxiety and depression contradicts previous survey studies which reported marked reductions in negative emotionality following the repeated microdosing of psychedelic substances (Anderson et al., 2019; Johnstad, 2018; Polito and Stevenson, 2019). This discrepancy may be due to four key elements in our method, including the mental well-being of our participants at baseline, the use of psilocybin only, the duration of the microdosing period and the inclusion of a placebo condition.

First, our participants were only admitted if our pre-trial screening deemed them as physically and mentally healthy, and their symptoms of anxiety and depression at baseline were within the normal range on average. Johnstad (2018) and Anderson et al. (2019) did not include this criterion within their designs, allowing for participants with clinical range symptoms at baseline. This creates the possibility that their significant reductions in negative emotionality were in part due to higher negative emotionality at baseline, whereas our participants may have experienced a ceiling effect; they were already mentally healthy prior to microdosing and could not show further improvement during the study. However, this argument is countered by Polito and Stevenson (2019) who did explicitly focus on a non-clinical population. They reported low DASS-21 scores at baseline, yet found marked reductions in depression and stress scores. Thus, although the baseline DASS-21 scores of our participants were in the same range as those of Polito and Stevenson (2019), we failed to see additional improvements in our participants’ depression scores after microdosing. However, Polito and Stevenson (2019) did not find a reduction in anxiety scores after microdosing, which does align with our findings. Moreover, post hoc analyses of the DASS-21 subscale scores in comparison with baseline scores did reveal significant reductions in the stress and depression subscales in block 1, but regardless of condition.

Second, previous results demonstrated by Johnstad (2018), Anderson et al. (2019) and Polito and Stevenson (2019) were based on psychedelic microdoses in general, while we chose to focus on specifically psilocybin. It is thus possible that previous results were driven by the effects of psychedelic substances other than psilocybin. However, Bershad and colleagues (2019) investigated the effect of three different microdoses of LSD (6.5, 13 and 25 μg) and also did not find a significant effect of these doses on emotion processing nor on negative emotionality. Relatedly, in our study, we had little control over the specific amount of psilocybin that participants consumed, due to natural variability in different batches of psilocybin-containing truffles. Next to that, it is possible that we also manipulated other active compounds found in the psilocybin-containing truffles and that these influenced our results.

Third, our participants consumed the microdoses for a shorter duration (3 weeks) compared with those in the research by Polito and Stevenson (2019; 6 weeks) and likely in the research by Johnstad (2018) and Anderson et al. (2019), although here the specific duration of microdosing was not reported. While the appropriate time necessary for the benefits of microdosing to take effect is unknown, it is known that serotonergic antidepressants can take up to 2 months before measurable effects arise (Harmer et al., 2009), potentially because their effects are due to certain downstream changes in brain structure and function (Erb et al., 2016; Hanson et al., 2011). The argument that effects of microdoses may also require a longer period of repeated dosing rests on two key findings: that depression and stress-related disorders are associated with neural atrophy in the prefrontal cortex (PFC; Christoffel et al., 2011) and that serotonergic psychedelics can increase structural and functional plasticity in the PFC (Ly et al., 2018; Olson, 2018), thereby potentially counteracting the neurobiological markers of these disorders. It is possible that a period of consistent microdosing which succeeds 3 weeks is required for such changes to develop and we can expect an effect on emotion processing and mood-related symptoms only after these changes have occurred.

Nevertheless, Cameron et al. (2019) administered microdoses of the serotonergic psychedelic DMT to rats every third day for 7 weeks and revealed no markers of increased neural plasticity. In fact, the researchers found a decrease in dendritic spine density in PFC of female rats. Important to note is that the original association between serotonergic psychedelics and neuronal plasticity is based on the effect of a single large serotonergic psychedelic dose. Single large doses of DMT and LSD were found to promote spinogenesis, synaptogenesis and neural plasticity in cortical neuron cultures of rats 24 h after administration (Ly et al., 2018). Taken together, this evidence, although limited in its generalizability to humans, may indicate that regardless of the duration of the dosing period, psilocybin microdoses are simply not potent enough to trigger structural changes in the cortex.

Another factor that could account for the apparent conflict with previous findings is our implementation of a placebo-control group. It is plausible that previous results were driven by participants’ expectations rather than the chemical components of the doses. This would mean that the sole act of taking doses improved participants’ mental health scores, regardless of whether the doses were placebos or psilocybin microdoses. Indeed, Kaertner et al. (2021) found that positive expectancy scores at baseline predicted changes in well-being after 4 weeks of microdosing. In our participants, we observed an overall decrease in the depression and stress scores from baseline to block 1, irrespective of the condition that the participants were assigned to. This effect, termed the ‘placebo effect’, is especially relevant in clinical and pharmacological research and refers to the situation when blinded participants in the placebo condition experience a reduction in symptoms either due to their positive expectations towards the treatment condition or due to previous conditioning of the treatment condition (Meissner et al., 2011). Especially in antidepressant research, placebo doses evoke reductions in symptoms comparable with the antidepressant (Kirsch, 2014). Such potent placebo responses may also be contributing to previous findings regarding the effects of psilocybin microdosing and make it difficult to assess whether psilocybin microdosing is effective beyond expectations and conditioning.

Of relevance, through an exploratory analysis of our participants’ condition guesses, we found that participants broke blind regarding their condition in the second block. This confound had the potential to further contribute to response expectancy effects. However, we found no difference between psilocybin and placebo conditions in our outcome measures in either block, which indicates that explicit expectations likely did not influence our results. Moreover, in contrast to Kaertner et al. (2021), we found no effect of expectation in further post hoc exploratory analyses. We propose two possible reasons for this lack of an effect of psilocybin microdosing on outcome measures: either the placebos and psilocybin microdoses were equally ineffective at influencing a change in response to the scales that we used (potentially the measures were not sensitive enough), or the placebo effect was equally as effective as the microdosing effect but was guided by processes other than explicit expectations, such as previous conditioning (e.g. as demonstrated by Amanzio and Benedetti, 1999). Previous experience with psychedelic substances could evoke a placebo effect based on conditioning. Most participants in this study had taken psychedelics before and may therefore have been subject to such conditioning. Thus, including a placebo condition may have dampened our effect of interest.

Finally, we need to consider the possibility that microdosing does not affect depression and anxiety at all, as our findings consistently indicate. Previously reported beneficial effects may be related to other confounding factors, as mentioned above, and experimental research thus far fails to show these hypothesized effects of microdosing on clinically relevant outcome measures (Bershad et al., 2019; Family et al., 2020).

Limitations

We note five key limitations of our study. First, our sample suffers from selection bias, since participants were self-selected from a microdosing workshop. As a result, most of our participants had tried psychedelics previously, which means that they may have broken blind easier or may have been desensitized to the microdosing effects. Second, the psilocybin doses were made by the participants using dried psilocybin truffles, meaning that we cannot be sure of the exact amounts of psilocybin in the individual doses that the participants consumed. It is possible that the degree of psilocybin content varied across participants and thereby obscured our results. Third, we encountered a large drop-out rate during this project and several participants did not sufficiently comply with the behavioural guidelines to be included in the analyses. This resulted in small sample size relative to existent observational studies and in a further selection bias (i.e. only motivated participants likely stayed in). Moreover, due to such sample size, our study may have been underpowered to detect true effects, particularly the interaction effect hypothesized for the emotional go/no-go task. Our post hoc power analysis suggested that our design, given our observed data, was insufficiently powered to detect this effect. Simulated data in the hypothesized direction, however, yielded sufficient power with a large effect size. Of course, as noted earlier, this analysis based on simulated data remains speculative and we encourage future studies to plan their sample size according to expected RT patterns. Fourth, we measured the effects in our study only after self-administration of a dose, and not between doses or after each block. Thus, our results may be confounded by the acute effect of the psilocybin dose, which may differ from its persistent effect after the acute chemical-induced symptoms have subsided. However, Szigeti et al. (2021) did assess both acute and post-acute effects and found no significant microdose vs placebo differences in psychological outcomes when accounting for participants breaking blind. Last, our study is a combined field and lab-based study, meaning that the results may not be readily generalizable or replicable, for example, in a more clinical setting.

The psychologists with tattoos were viewed as less professional, but the ones with provocative tattoos were seen as more competent in interventions, empathy, ability to practice in a forensic setting, & as more confident, interesting, likable, & less lazy

Zidenberg, A. M., Dutrisac, S., & Olver, M. (2021). “No ragrets”: Public perceptions of tattooed mental health professionals. Professional Psychology: Research and Practice, Dec 2021. https://doi.org/10.1037/pro0000441

Abstract: Clinical psychology students and practitioners are conventionally advised to “cover up” their tattoos, as they may be deemed unprofessional by clients and risk hindering the working alliance. While this may seem reasonable on the surface, the only research available on the topic has focused on psychologists’ self-perceptions and perceptions of tattooed colleagues, which seem to be negative, rather than exploring client perceptions of tattooed clinicians themselves. The present study explored the perceptions of a fictional clinical psychologist profile, including one of three photos (no tattoo, neutral tattoo, or provocative tattoo). Participants were asked to rate the competence of the clinical psychologist, and their feelings toward her. Results indicated that the psychologist with the provocative tattoo was viewed as more competent in the domains of interventions, empathy, ability to practice in a forensic setting, and with adult populations. The psychologist with the provocative tattoo was also rated as more confident, interesting, likable, and less lazy than the psychologist with the neutral tattoo or no tattoo. Although participants rated the two tattooed psychologists as appearing less professional than the psychologist with no tattoo, this did not appear to translate into negative feelings toward the tattooed psychologists or an unwillingness to seek services from them. The results suggest that, contrary to conventional wisdom, psychologists and their trainees may not need to take special precautions to conceal visible tattoos. Tattoos do not seem to impact perceptions of clinician competence among the general public and may even aid the formation of professional bonds with clientele.

Simulation of 100 000 years of evolution in hunter-gatherers: Evolutionary shifts in disgust as polygenic trait occurred (consequence of germ-cell mutations), but cultural transmission between generations operated more quickly & at greater magnitude

The human behavioural immune system is a product of cultural evolution. Edwin S. Dalmaijer, Thomas Armstrong. arXiv Dec 17 2021, https://arxiv.org/abs/2008.13211

Abstract: To avoid disease, humans show far greater contamination sensitivity and avoidance than their closest living relatives. This is driven by an increased propensity to experience disgust. There is broad agreement that uniquely sensitive disgust in humans is an evolutionary adaptation, which was previously thought to be fuelled by both cultural and genetic inheritance. However, current theories have centred biology and sidelined culture, despite surprisingly little empirical evidence to support this claim. Here, we simulated 100 000 years of evolution in human hunter-gatherers to directly compare genetic and cultural inheritance in a variety of scenarios. We modelled disgust avoidance as a trait that governed the extent to which individuals forewent potentially contaminated nutrition to avoid risking gastrointestinal illness. Our results confirmed natural selection for disgust, particularly as the level and cost of contamination in an environment increased. Evolutionary shifts in disgust as polygenic trait occurred as a consequence of germ-cell mutations, but were more prominent in populations with high initial genetic variance. Crucially, cultural transmission between generations operated more quickly and at greater magnitude, even if parental modelling was eliminated. Our computational work supports the hypothesis that cultural evolution outpaced its biological counterpart to select health-improving behaviours that benefited survival. This study serves not only as evidence of cultural evolution shaping the behavioural immune system, but is also an illustration of emerging theories that paint affective and cognitive mechanisms as socially transmitted rather than biologically determined functions.

Meat consumption: Health or environmental information has no main effect on attitude and no effect on intention or behavior

Can information influence meat consumption behaviour? An experimental field study in the university canteen. Nina Weingarten et al. Food Quality and Preference, December 17 2021, 104498. https://doi.org/10.1016/j.foodqual.2021.104498

Highlights

• The study combines an online survey with a field study in a university canteen.

• Aim of the study is to investigate the role of information on meat consumption.

• Health information has no main effect on attitude, intention, or behavior.

• Environmental information has no main effect on attitude, intention, or behavior.

• Subjective knowledge moderates the effect of environmental information on attitude.

Abstract: The present study investigates the effectiveness of health and environmental information provision as an intervention to reduce meat consumption behaviour. In an experimental online survey (n = 194), we tested how information about the negative effects of meat consumption on health or the environment influence attitude and intention to reduce meat consumption. In the following two weeks, we measured participants’ meat consumption behaviour in the university canteen, which we accessed through an individual purchase card. Contrary to our hypotheses, our results show that there is no direct effect of health or environmental information on attitude, intention, or meat consumption behaviour compared to the control group. However, our results indicate that for participants with low subjective knowledge, environmental information is effective in influencing attitude. Neither attitude nor intention mediates the relationship between information and behaviour. Our findings highlight that information provision has limited effectiveness in changing attitude, but does not influence intention or behaviour. We conclude that more research is needed that includes a direct measure of meat consumption behaviour to evaluate the effectiveness of information provision as an intervention.

Keywords: Meat consumptionBehaviourHealth informationEnvironmental informationUniversity canteenSubjective knowledge

Countries that became less wealthy and more morally polarized over time also became less trustful

Stavrova, O., Evans, A. M., & Brandt, M. J. (2021). Ecological dimensions explain the past but do not predict future changes in trust. American Psychologist, 76(6), 983–996. Dec 2021.  https://doi.org/10.1037/amp0000815

Abstract: Concerns about declining trust and rising cynicism are recurrent in academic research and the media. Yet, prior studies focused on explaining, rather than predicting, temporal changes in trust. We tested prediction models of trust change across (up to) 98 countries over six measurement waves (from 1981 to 2014). We tested whether different ecological predictors (e.g., pathogen prevalence, population diversity, inequality) explain the past and predict future trust levels across countries. We used societal growth curve models to disentangle between- from within-country effects and evaluated the accuracy of the models’ out-of-sample predictions using the train-test split method: We used data from 1981–2009 to “train” the models and obtain predictions of trust for the period of 2010–2014. None of our models was more accurate in predicting future trust than a simpler baseline model. Moreover, we did not observe a universal decline in trust. Instead, temporal changes in trust were country-specific, highlighting the locality of cultural change. Most ecological predictors were correlated with between-country differences in trust. Only resource availability and moral opinion polarization were associated with within-country changes in trust: Countries that became less wealthy and more morally polarized over time also became less trustful. These results highlight important differences between explanatory and predictive models and suggest that ecological theories of trust might be of limited use when predicting future cultural shifts.

 

The story of how cognition and fitness relate may not be simple, but simple stories and complex systems rarely go together

Cognition and reproductive success in cowbirds. David J. White, J. Arthur, H. B. Davies & M. F. Guigueno. Learning & Behavior, Dec 16 2021. https://link.springer.com/article/10.3758/s13420-021-00506-0

Abstract: Understanding the relationships between cognitive abilities and fitness is integral to an evolutionary study of brain and behavior. However, these relationships are often difficult to measure and detect. Here we draw upon an opportunistic sample of brown-headed cowbird (Molothrus ater) subjects that had two separate research experiences: First, they engaged in a large series of cognitive tests in David Sherry’s Lab in the Advanced Facility for Avian Research (AFAR) at Western University, then subsequently moved to the Field Avian Research Megalab (FARM) at Wilfrid Laurier University where they lived in large breeding flocks in aviaries with other wild-caught cowbirds. Thus, we had extensive measures of cognitive abilities, breeding behavior, and reproductive success for these birds. We report here, for the fist time, the surprisingly strong connections we found among these different measures. Female cowbirds’ spatial cognitive abilities correlated positively with how intensely they were courted by males, and with their overall egg production. Males’ spatial cognition correlated positively with their ability to engage in singing contests (“countersinging”) with other males. In addition, a separate non-spatial cognitive ability correlated positively with the attractiveness of the songs they sung. In sum, these results suggest the cognitive skills assessed in the lab were strongly connected to breeding behavior and reproductive success. Moreover, since certain cognitive abilities related to different aspects of breeding success, it suggests that cognitive modules may have specialized adaptive value, but also that these specialized skills may interact and influence fitness in surprising ways.

Discussion

Despite the small sample size, the different cognitive scores correlated with several aspects of breeding behavior and reproductive success in both males and females.

Females

Those females who reliably scored highest on spatial tests in the lab received the most courtship song from males. The number of songs sung to females is an important variable associated with pairbond strength and copulation success, and thus is integral to reproduction (White et al., 2010a, b, c). It is unclear what drives this correlation. It is possible that there is something about these females that makes them more attractive to males. Results of past work, however, would suggest that something about the females’ behavior is important in stimulating the males to sing to them more often (Maguire et al., 2013). What females do to get males to sing to them more often is unknown – though one possibility is the use of chatter in response to males’ song (Maguire et al., 2013).

The other variable significantly associated with cognition for females was egg production. Females are often highly variable in egg production between and across groups and past work has been only marginally successful in explaining this variation. Most of those explanations have revolved around the idea that females invest more in egg production in circumstances where they have the most valuable information about the quality of males present (White et al., 2010a, b, c). The cognition score used here is by far the strongest explanatory variable we have ever found for egg production. Perhaps females who have better cognitive abilities can best engage in the behaviors associated with selecting the highest quality, or most compatible mate, building the most successful pairbond, and therefore most likely to invest in egg production. An interesting aspect of this relationship is that laying more eggs leads to a higher spatial memory demand because it requires finding more nests. No matter what mechanism explains this relationship, the connection between spatial cognition and reproductive success suggests that sexual selection can be a driving force on spatial cognition in females.

Males

We had the opportunity to examine how two measures of cognitive performance related to males’ fitness. First, we found that song attractiveness, as measured in playback tests related to the males’ performance on cognitive tasks that used color stimuli in delayed match-to-sample tests. That song attractiveness related to cognitive performance supports the theory that those males best able to learn are the ones who can produce the most attractive signal – a theory of the functional value of song that has been posited for songbirds in general (Nowicki et al., 1998, 2002) and cowbirds specifically (West & King, 1988). These results connecting cognitive performance and song differ from work in song sparrows (Soha et al., 2019), where no connections between cognition and song could be detected (see also Templeton et al., 2014). Why song attractiveness should relate to cognition for color per se, is unclear. Perhaps song attractiveness and performance on the color tasks are linked by another unmeasured variable relating to male quality (health, “good genes”, or stress responsiveness). This would appear unlikely since past work has shown that song attractiveness is highly dependent on developmental (West & King, 1988) and immediate (Gersick & White, 2018) social experiences. Thus, the most likely route leading to variation in song attractiveness involves interacting and learning from the visual responses of females and other males to singing overtures. The color tasks were designed as a control for spatial memory performance and not designed specifically to examine an aspect of cognition hypothesized to be important to male breeding behavior. Thus, the color tasks may be measuring some more general aspect of visual acuity, attention, or learning. More work is needed to determine exactly what cognitive mechanism is driving color discrimination and song development. It is clear, however, that the cognitive ability measured using the color task was distinct from spatial memory skill because performance on spatial tasks did not relate to song attractiveness.

Spatial task performance did, however, relate to one important aspect of singing in males: countersinging. Countersinging is a skill that males must learn in order to attain and maintain dominance among males and to stimulate the reproductive output of females (White et al., 2010a, b, c). Past work has shown that countersinging is learned by juveniles over their first year of life as they approach and sing with adult males (White, King, & West, 2002a). This ability to get close to other males, sing with them in duetting bouts, and temper aggression leads to a cascade of learning other breeding skills and is highly variable among males (White et al., 2007a, b; White, King, & West, 2002a).

No other variables for males or females reached the large effect size necessary for statistical significance (other than chatter patterns in females). There is, however, a distinction that should be made between the correlation strength needed for statistical confidence and for biological relevance. Evolution can act on very small effects. Tables 1 and 2 show some of the effects that did not reach significance but will be the subject of future work, as many of them may inform us of the potential directions of effect occurring with other variables. For example, female chatter is highly stimulating and motivating to males (Burnell & Rothstein, 1994; Freed-Brown & White, 2009; Hauber et al., 2001; Lynch et al., 2017; Snyder-Mackler & White, 2011). Perhaps the production and use of chatter is a behavioral mechanism that females use to regulate males’ behavior, stimulate courtship effort, and strengthen the pairbond (Maguire et al., 2013), leading eventually to more egg output. Other interesting positive relationships with females’ spatial cognition include the song attractiveness of their pairmate, and the amount of courtship song they receive only from their pairmate (a measure of pairbond strength we have found in the past to be important for breeding success; Maguire et al., 2013).

The disclaimers here are most likely obvious: the frustratingly low sample size highlights the challenges for neuroecology and studies of animal cognition in general where the depth of understanding of individuals’ cognitive abilities trades off against testing large numbers of subjects and therefore against generalizability and statistical power. The low number of subjects precluded more detailed statistical analyses, and we could only rely on a small number of a priori comparisons requiring very strong relationships to reject a null hypothesis. Also, the birds in this study, while wild caught, experienced years of life in abnormal contexts, raising questions about generalizability to the wild (although in the aviaries they bred in patterns very similar to the resident birds). Finally, it was not the primary goal of the cognitive experiments to subsequently study fitness. Had it been, we would have ensured that we collected measures that were more directly comparable across subjects. As is, it is not clear what cognitive modules we are examining here. The color-discrimination tasks might be measuring visual acuity, attention, learning speed, etc. Spatial cognition here also includes tasks that were focused on numerical discrimination. Thus, this work should be considered an exploratory first step that, even with the limitation inherent in these data, was surprisingly successful in demonstrating relationships between different aspects of cognition and reproductive success. This discovery will drive experiments both in the lab and in aviaries for years to come.

What do these findings mean for the adaptive specialization hypothesis about cowbird spatial memory? We still have not been able to test directly whether spatial cognition abilities allow females to successfully find and select viable nests in the wild – the critical relationship posited by the adaptive specialization hypothesis that started the work with cowbirds. With modern advances in automated tracking technology and advances in neural manipulations, this relationship may be testable in the near future. The findings reported here – that different measures of cognition related to different aspects of effective breeding – support the idea that there are functionally distinct cognitive systems as proposed by Sherry and Schacter (1987). There do seem to be different cognitive domains at work here, similar to food-caching species that show different patterns of performance depending on whether a task is spatially based or color based (Olson et al., 1995). Females’ superiority in behavioral tasks and the hippocampal size evidence suggest that the potential exists for selection to act on spatial cognition through nest-finding abilities. The interconnections between these cognitive systems and diverse aspects of breeding revealed here, however, suggests some cooption, or exaptation of the cognitive system, which significantly complicates determining how selection has acted and may act (Gould & Vrba, 1982; Sherry & Schacter, 1987). Selection may be operating on spatial memory skills for both a specialized demand on the species (finding nests), and also a non-specialized demand (selecting a mate and reproducing). This suggests there are non-additive interactions among cognitive modules and fitness.

The story of how cognition and fitness relate may not be simple, but simple stories and complex systems rarely go together. The complexity of living systems presents many different routes and strategies leading to reproductive success and thus identifying how distinct memory systems relate to fitness can be challenging. Studying the wealth of links between memory systems, however – how they can work independently and together, how they react to different environments, to past experiences and to conspecifics – and ultimately lead to organizing adaptive behavior holds the promise to fully understand the evolution of the brain and intelligence.