Cerebellar modulation of the reward circuitry and social behavior. Ilaria Carta et al. Science Jan 18 2019:Vol. 363, Issue 6424, eaav0581. DOI: 10.1126/science.aav0581
The cerebellum and reward-driven behavior
Damage to the cerebellum manifests itself in various forms of cognitive impairment and abnormal social behavior. However, the exact role the cerebellum plays in these conditions is far from clear. Working in mice, Carta et al. found direct projections from the deep cerebellar nuclei to the brain's reward center, a region called the ventral tegmental area (see the Perspective by D'Angelo). These direct projections allowed the cerebellum to play a role in showing a social preference. Intriguingly, this pathway was not prosocial on its own. Cerebellar inputs into the ventral tegmental area were more active during social exploration. Depolarization of ventral tegmental area neurons thus represents a similar reward stimulus as social interaction for mice.
Abstract
INTRODUCTION: Although the cerebellum has long been considered to be a purely motor structure, recent studies have revealed that it also has critical nonmotor functions. Cerebellar dysfunction is implicated in addictive behavior and in mental disorders such as autism spectrum disorder (ASD), cognitive affective syndrome, and schizophrenia. The cerebellum is well poised to contribute to behavior because it receives a wide array of cortical and sensory information and is subject to control by a number of neuromodulators. To perform its function, the cerebellum is believed to integrate these diverse inputs to provide the rest of the brain with predictions required for optimal behavior. Although there are many pathways for this to occur in the motor domain, fewer exist for the nonmotor domain.
RATIONALE: There are no direct pathways emanating from the cerebellum that have been shown to serve nonmotor functions. We hypothesized that the cerebellum may contribute to motivated behavior by a direct projection to the ventral tegmental area (VTA), a structure that is critical for the perception of reward and control of social behaviors. Such a projection would explain why functional imaging experiments indicate that the cerebellum plays a role in addiction and would provide one potential mechanism by which cerebellar dysfunction might contribute to the symptoms of mental disorders.
RESULTS: In mice, we found that monosynaptic excitatory projections from the cerebellar nuclei to the VTA powerfully activate the reward circuitry and contribute to social behavior. Using anatomical tracing, we showed that axonal projections from the cerebellar nuclei form synapses with both dopaminergic and nondopaminergic neurons in the VTA. The cerebello-VTA (Cb-VTA) projections were powerful and their optogenetic stimulation robustly increased the activity of VTA neurons both in vivo and in vitro. Behavioral tests to examine reward processing showed that stimulation of the Cb-VTA projections was sufficient to cause short-term and long-term place preference, thereby demonstrating that the pathway was rewarding. Although optogenetic inhibition of Cb-VTA projections was not aversive, it completely abolished social preference in the three-chamber test for sociability, which suggests that the cerebellar input to the VTA is required for normal social behavior. A role for the cerebellum in social behavior was also indicated by correlation between calcium activity in these axons and performance in the three-chamber test. However, optogenetic activation of the Cb-VTA inputs was not prosocial, hence the pathway was not sufficient for social behavior.
CONCLUSION: The Cb-VTA pathway described here is a monosynaptic projection from the cerebellum to a structure known primarily for its nonmotor functions. Our data support a role for the cerebellum in reward processing and in control of social behavior. We propose that this Cb-VTA pathway may explain, at least in part, the association between the cerebellum and addictive behaviors, and provides a basis for a role for the cerebellum in other motivated and social behaviors. In addition to contributing to reward processing, the VTA also targets a number of other brain regions, such as the prefrontal cortex, that in turn sustain a large repertoire of motor and nonmotor behaviors. Direct cerebellar innervation of the VTA provides a pathway by which the cerebellum may modulate these diverse behaviors. The Cb-VTA pathway delineated here provides a mechanism by which cerebellar dysfunction, by adversely affecting the VTA and its targets, might contribute to mental disorders such as ASD and schizophrenia.
Also:
Also: http://www.einstein.yu.edu/news/releases/1323/brains-cerebellum-found-to-influence-addictive-and-social-behavior
Friday, January 18, 2019
Elders were less likely to recollect their original judgment than young adults, & had to reconstruct it more frequently; & outcome knowledge distorted more the reconstruction of original judgment in elders
Groß, J., & Pachur, T. (2019). Age differences in hindsight bias: A meta-analysis. Psychology and Aging, http://dx.doi.org/10.1037/pag0000329
Abstract: After people have learned a fact or the outcome of an event, they often overestimate their ability to have known the correct answer beforehand. This hindsight bias has two sources: an impairment in direct recall of the original (i.e., uninformed) judgment after presentation of the correct answer (recollection bias) and a reconstruction of the original judgment that is biased toward the correct answer (reconstruction bias). Research on how cognitive aging affects these two sources of hindsight bias has produced mixed results. To synthesize the available findings, we conducted a meta-analysis of nine studies (N = 366 young, N = 368 older adults). We isolated the probabilities of recollection, recollection bias, and reconstruction bias with a Bayesian, three-level hierarchical implementation of the multinomial processing tree model of hindsight bias (Erdfelder & Buchner, 1998). Additionally, we quantified the magnitude of bias in the reconstructed judgment. Overall, older adults were less likely to recollect their original judgment than young adults, and thus had to reconstruct it more frequently. Importantly, whereas outcome knowledge impaired recollection of the original judgment (i.e., recollection bias) to a similar extent in both age groups, outcome knowledge was more likely to distort reconstruction of the original judgment (i.e., reconstruction bias) in older adults. In addition, the magnitude of bias in the reconstructed judgments was slightly larger in older than in young adults. Our results provide the basis for a targeted investigation of the mechanisms driving these age differences.
Abstract: After people have learned a fact or the outcome of an event, they often overestimate their ability to have known the correct answer beforehand. This hindsight bias has two sources: an impairment in direct recall of the original (i.e., uninformed) judgment after presentation of the correct answer (recollection bias) and a reconstruction of the original judgment that is biased toward the correct answer (reconstruction bias). Research on how cognitive aging affects these two sources of hindsight bias has produced mixed results. To synthesize the available findings, we conducted a meta-analysis of nine studies (N = 366 young, N = 368 older adults). We isolated the probabilities of recollection, recollection bias, and reconstruction bias with a Bayesian, three-level hierarchical implementation of the multinomial processing tree model of hindsight bias (Erdfelder & Buchner, 1998). Additionally, we quantified the magnitude of bias in the reconstructed judgment. Overall, older adults were less likely to recollect their original judgment than young adults, and thus had to reconstruct it more frequently. Importantly, whereas outcome knowledge impaired recollection of the original judgment (i.e., recollection bias) to a similar extent in both age groups, outcome knowledge was more likely to distort reconstruction of the original judgment (i.e., reconstruction bias) in older adults. In addition, the magnitude of bias in the reconstructed judgments was slightly larger in older than in young adults. Our results provide the basis for a targeted investigation of the mechanisms driving these age differences.
Aggression in mice is differentially predicted by the volumes of anterior and midcingulate cortex
Aggression in BALB/cJ mice is differentially predicted by the volumes of anterior and midcingulate cortex. Sabrina van Heukelum et al. Brain Structure and Function, https://link.springer.com/article/10.1007/s00429-018-1816-9
Abstract: Anterior cingulate cortex (ACC) and midcingulate cortex (MCC) have been implicated in the regulation of aggressive behaviour. For instance, patients with conduct disorder (CD) show increased levels of aggression accompanied by changes in ACC and MCC volume. However, accounts of ACC/MCC changes in CD patients have been conflicting, likely due to the heterogeneity of the studied populations. Here, we address these discrepancies by studying volumetric changes of ACC/MCC in the BALB/cJ mouse, a model of aggression, compared to an age- and gender-matched control group of BALB/cByJ mice. We quantified aggression in BALB/cJ and BALB/cByJ mice using the resident–intruder test, and related this to volumetric measures of ACC/MCC based on Nissl-stained coronal brain slices of the same animals. We demonstrate that BALB/cJ behave consistently more aggressively (shorter attack latencies, more frequent attacks, anti-social biting) than the control group, while at the same time showing an increased volume of ACC and a decreased volume of MCC. Differences in ACC and MCC volume jointly predicted a high amount of variance in aggressive behaviour, while regression with only one predictor had a poor fit. This suggests that, beyond their individual contributions, the relationship between ACC and MCC plays an important role in regulating aggressive behaviour. Finally, we show the importance of switching from the classical rodent anatomical definition of ACC as cingulate area 2 and 1 to a definition that includes the MCC and is directly homologous to higher mammalian species: clear behaviour-related differences in ACC/MCC anatomy were only observed using the homologous definition.
Keywords: Prefrontal cortex Rodent Brain volume Aggression Mouse model
Abstract: Anterior cingulate cortex (ACC) and midcingulate cortex (MCC) have been implicated in the regulation of aggressive behaviour. For instance, patients with conduct disorder (CD) show increased levels of aggression accompanied by changes in ACC and MCC volume. However, accounts of ACC/MCC changes in CD patients have been conflicting, likely due to the heterogeneity of the studied populations. Here, we address these discrepancies by studying volumetric changes of ACC/MCC in the BALB/cJ mouse, a model of aggression, compared to an age- and gender-matched control group of BALB/cByJ mice. We quantified aggression in BALB/cJ and BALB/cByJ mice using the resident–intruder test, and related this to volumetric measures of ACC/MCC based on Nissl-stained coronal brain slices of the same animals. We demonstrate that BALB/cJ behave consistently more aggressively (shorter attack latencies, more frequent attacks, anti-social biting) than the control group, while at the same time showing an increased volume of ACC and a decreased volume of MCC. Differences in ACC and MCC volume jointly predicted a high amount of variance in aggressive behaviour, while regression with only one predictor had a poor fit. This suggests that, beyond their individual contributions, the relationship between ACC and MCC plays an important role in regulating aggressive behaviour. Finally, we show the importance of switching from the classical rodent anatomical definition of ACC as cingulate area 2 and 1 to a definition that includes the MCC and is directly homologous to higher mammalian species: clear behaviour-related differences in ACC/MCC anatomy were only observed using the homologous definition.
Keywords: Prefrontal cortex Rodent Brain volume Aggression Mouse model
Is Language Required to Represent Others’ Mental States? Language does not form an essential part of the process of reasoning online (“in the moment”) about false beliefs
Is Language Required to Represent Others’ Mental States? Evidence From Beliefs and Other Representations. Steven Samuel et al. Cognitive Science, https://doi.org/10.1111/cogs.12710
Abstract: An important part of our Theory of Mind—the ability to reason about other people's unobservable mental states—is the ability to attribute false beliefs to others. We investigated whether processing these false beliefs, as well as similar but nonmental representations, is reliant on language. Participants watched videos in which a protagonist hides a gift and either takes a photo of it or writes a text about its location before a second person inadvertently moves the present to a different location, thereby rendering the belief and either the photo or text false. At the same time, participants performed either a concurrent verbal interference task (rehearsing strings of digits) or a visual interference task (remembering a visual pattern). Results showed that performance on false belief trials did not decline under verbal interference relative to visual interference. We interpret these findings as further support for the view that language does not form an essential part of the process of reasoning online (“in the moment”) about false beliefs.
Abstract: An important part of our Theory of Mind—the ability to reason about other people's unobservable mental states—is the ability to attribute false beliefs to others. We investigated whether processing these false beliefs, as well as similar but nonmental representations, is reliant on language. Participants watched videos in which a protagonist hides a gift and either takes a photo of it or writes a text about its location before a second person inadvertently moves the present to a different location, thereby rendering the belief and either the photo or text false. At the same time, participants performed either a concurrent verbal interference task (rehearsing strings of digits) or a visual interference task (remembering a visual pattern). Results showed that performance on false belief trials did not decline under verbal interference relative to visual interference. We interpret these findings as further support for the view that language does not form an essential part of the process of reasoning online (“in the moment”) about false beliefs.
Both numerical magnitude & order processing were uniquely related to arithmetic achievement, beyond domain‐general factors (intellectual ability, working memory, inhibitory control, & non‐numerical ordering)
Disentangling the Mechanisms of Symbolic Number Processing in Adults’ Mathematics and Arithmetic Achievement. Josetxu Orrantia et al. Cognitive Science, https://doi.org/10.1111/cogs.12711
Abstract: A growing body of research has shown that symbolic number processing relates to individual differences in mathematics. However, it remains unclear which mechanisms of symbolic number processing are crucial—accessing underlying magnitude representation of symbols (i.e., symbol‐magnitude associations), processing relative order of symbols (i.e., symbol‐symbol associations), or processing of symbols per se. To address this question, in this study adult participants performed a dots‐number word matching task—thought to be a measure of symbol‐magnitude associations (numerical magnitude processing)—a numeral‐ordering task that focuses on symbol‐symbol associations (numerical order processing), and a digit‐number word matching task targeting symbolic processing per se. Results showed that both numerical magnitude and order processing were uniquely related to arithmetic achievement, beyond the effects of domain‐general factors (intellectual ability, working memory, inhibitory control, and non‐numerical ordering). Importantly, results were different when a general measure of mathematics achievement was considered. Those mechanisms of symbolic number processing did not contribute to math achievement. Furthermore, a path analysis revealed that numerical magnitude and order processing might draw on a common mechanism. Each process explained a portion of the relation of the other with arithmetic (but not with a general measure of math achievement). These findings are consistent with the notion that adults’ arithmetic skills build upon symbol‐magnitude associations, and they highlight the effects that different math measures have in the study of numerical cognition.
Abstract: A growing body of research has shown that symbolic number processing relates to individual differences in mathematics. However, it remains unclear which mechanisms of symbolic number processing are crucial—accessing underlying magnitude representation of symbols (i.e., symbol‐magnitude associations), processing relative order of symbols (i.e., symbol‐symbol associations), or processing of symbols per se. To address this question, in this study adult participants performed a dots‐number word matching task—thought to be a measure of symbol‐magnitude associations (numerical magnitude processing)—a numeral‐ordering task that focuses on symbol‐symbol associations (numerical order processing), and a digit‐number word matching task targeting symbolic processing per se. Results showed that both numerical magnitude and order processing were uniquely related to arithmetic achievement, beyond the effects of domain‐general factors (intellectual ability, working memory, inhibitory control, and non‐numerical ordering). Importantly, results were different when a general measure of mathematics achievement was considered. Those mechanisms of symbolic number processing did not contribute to math achievement. Furthermore, a path analysis revealed that numerical magnitude and order processing might draw on a common mechanism. Each process explained a portion of the relation of the other with arithmetic (but not with a general measure of math achievement). These findings are consistent with the notion that adults’ arithmetic skills build upon symbol‐magnitude associations, and they highlight the effects that different math measures have in the study of numerical cognition.
When the Muses Strike: Creative Ideas of Physicists and Writers Routinely Occur During Mind Wandering
When the Muses Strike: Creative Ideas of Physicists and Writers Routinely Occur During Mind Wandering. Shelly L. Gable, Elizabeth A. Hopper, Jonathan W. Schooler. Psychological Science, https://doi.org/10.1177/0956797618820626
Abstract: How often are creative ideas generated during episodes of mind wandering, and do they differ from those generated while on task? In two studies (N = 98, N = 87), professional writers and physicists reported on their most creative idea of the day, what they were thinking about and doing when it occurred, whether the idea felt like an “aha” moment, and the quality of the idea. Participants reported that one fifth of their most significant ideas of the day were formed during spontaneous task-independent mind wandering—operationalized here as (a) engaging in an activity other than working and (b) thinking about something unrelated to the generated idea. There were no differences between ratings of the creativity or importance of ideas that occurred during mind wandering and those that occurred on task. However, ideas that occurred during mind wandering were more likely to be associated with overcoming an impasse on a problem and to be experienced as “aha” moments, compared with ideas generated while on task.
Keywords: creativity, mind wandering, insight, open data, open materials
Abstract: How often are creative ideas generated during episodes of mind wandering, and do they differ from those generated while on task? In two studies (N = 98, N = 87), professional writers and physicists reported on their most creative idea of the day, what they were thinking about and doing when it occurred, whether the idea felt like an “aha” moment, and the quality of the idea. Participants reported that one fifth of their most significant ideas of the day were formed during spontaneous task-independent mind wandering—operationalized here as (a) engaging in an activity other than working and (b) thinking about something unrelated to the generated idea. There were no differences between ratings of the creativity or importance of ideas that occurred during mind wandering and those that occurred on task. However, ideas that occurred during mind wandering were more likely to be associated with overcoming an impasse on a problem and to be experienced as “aha” moments, compared with ideas generated while on task.
Keywords: creativity, mind wandering, insight, open data, open materials
Disgust, sushi consumption, benefits, religion, and other predictors of acceptance of insects as food by Americans and Indians
Disgust, sushi consumption, and other predictors of acceptance of insects as food by Americans and Indians. Matthew B. Ruby, Paul Rozin. Food Quality and Preference, https://doi.org/10.1016/j.foodqual.2019.01.013
Highlights
• Americans (82%) were more willing to try eating insects than were Indians (48%).
• Benefits: Agreement was highest that rearing insects has low space requirements.
• Risks: Agreement was highest that eating insects may cause allergic reactions.
• USA: Willingness to eat insects was best predicted by Disgust and Benefit beliefs.
• Consumption of sushi is a good predictor of insect acceptance.
Abstract
Insects are an important human food source, especially in developing countries, because of their efficiency at converting plant foods into animal protein, and their relatively low environment impact. The present study builds on some prior research on eating insects by surveying Indian and American adults. A composite measure of insect acceptance is developed. The results confirm prior findings that Americans are more accepting of insects as a potential food than Indians, and that men are more accepting than women. Substantially more Indians than Americans consider insect ingestion a violation of a protected/sacred value, suggesting a moral objection. Attitudes to and beliefs about insects and insect consumption are decomposed through factor analysis into the same five factors in both countries: Benefits, Risks, Disgust, Religion, and Suffering. Multiple regression indicates that for Americans, Disgust is the major predictor, followed by Benefits. For Indians, the best predictor is Benefits, followed by Disgust and Religion. In both countries, frequency of sushi consumption (a food commonly met with disgust when it was first introduced) is also a significant and substantial predictor of insect acceptance.
Highlights
• Americans (82%) were more willing to try eating insects than were Indians (48%).
• Benefits: Agreement was highest that rearing insects has low space requirements.
• Risks: Agreement was highest that eating insects may cause allergic reactions.
• USA: Willingness to eat insects was best predicted by Disgust and Benefit beliefs.
• Consumption of sushi is a good predictor of insect acceptance.
Abstract
Insects are an important human food source, especially in developing countries, because of their efficiency at converting plant foods into animal protein, and their relatively low environment impact. The present study builds on some prior research on eating insects by surveying Indian and American adults. A composite measure of insect acceptance is developed. The results confirm prior findings that Americans are more accepting of insects as a potential food than Indians, and that men are more accepting than women. Substantially more Indians than Americans consider insect ingestion a violation of a protected/sacred value, suggesting a moral objection. Attitudes to and beliefs about insects and insect consumption are decomposed through factor analysis into the same five factors in both countries: Benefits, Risks, Disgust, Religion, and Suffering. Multiple regression indicates that for Americans, Disgust is the major predictor, followed by Benefits. For Indians, the best predictor is Benefits, followed by Disgust and Religion. In both countries, frequency of sushi consumption (a food commonly met with disgust when it was first introduced) is also a significant and substantial predictor of insect acceptance.
Investigating gender differences in school burnout from a self-worth perspective: Girls take school too seriously
Do girls take school too seriously? Investigating gender differences in school burnout from a self-worth perspective. Julia Herrmann, Karoline Koeppen, Ursula Kessels. Learning and Individual Differences, Volume 69, January 2019, Pages 150-161. https://doi.org/10.1016/j.lindif.2018.11.011
Highlights
• Lower school achievement is associated with higher levels of school burnout.
• Independent of grades, girls report higher levels of exhaustion.
• Girls report higher academic contingent self-esteem and lower global self-esteem.
• Academic contingent SE and motivation explain gender differences in exhaustion.
Abstract: Recent investigations have suggested that a considerable percentage of teenagers, especially those in academic track schools, report school-related burnout symptoms (exhaustion, cynicism and inadequacy). Low school achievement and female gender are discussed as risk factors for the syndrome. We investigated school burnout from an individual differences perspective, focusing on aspects of self-esteem (global self-esteem; academic contingent self-esteem) and their associations with specific types of motivational regulation (intrinsic; extrinsic) in a sample of N = 649 9th graders (59% female; 40% males) from six academic track schools in Germany. We hypothesized that gender would be associated with school burnout symptoms and that global self-esteem, academic contingent self-esteem, intrinsic motivation, and extrinsic motivation would mediate the relations. We tested these associations in a structural equation model that was adjusted for grades. Girls' higher scores on exhaustion could be explained through pathways via self-esteem aspects and motivation. Results may inform prevention practices.
Highlights
• Lower school achievement is associated with higher levels of school burnout.
• Independent of grades, girls report higher levels of exhaustion.
• Girls report higher academic contingent self-esteem and lower global self-esteem.
• Academic contingent SE and motivation explain gender differences in exhaustion.
Abstract: Recent investigations have suggested that a considerable percentage of teenagers, especially those in academic track schools, report school-related burnout symptoms (exhaustion, cynicism and inadequacy). Low school achievement and female gender are discussed as risk factors for the syndrome. We investigated school burnout from an individual differences perspective, focusing on aspects of self-esteem (global self-esteem; academic contingent self-esteem) and their associations with specific types of motivational regulation (intrinsic; extrinsic) in a sample of N = 649 9th graders (59% female; 40% males) from six academic track schools in Germany. We hypothesized that gender would be associated with school burnout symptoms and that global self-esteem, academic contingent self-esteem, intrinsic motivation, and extrinsic motivation would mediate the relations. We tested these associations in a structural equation model that was adjusted for grades. Girls' higher scores on exhaustion could be explained through pathways via self-esteem aspects and motivation. Results may inform prevention practices.
Thursday, January 17, 2019
The Minds of God(s) and Humans: Differences in Mind Perception in Fiji and North America; mind perception is shaped by culturally defined social expectations
The Minds of God(s) and Humans: Differences in Mind Perception in Fiji and North America. Aiyana K. Willard, Rita A. McNamara. Cognitive Science, https://doi.org/10.1111/cogs.12703
Abstract: Previous research suggests that how people conceive of minds depends on the culture in which they live, both in determining how they interact with other human minds and how they infer the unseen minds of gods. We use exploratory factor analysis to compare how people from different societies with distinct models of human minds and different religious traditions perceive the minds of humans and gods. In two North American samples (American adults, N = 186; Canadian students, N = 202), we replicated a previously found two‐factor agency/experience structure for both human and divine minds, but in Fijian samples (Indigenous iTaukei Fijians, N = 77; Fijians of Indian descent, N = 214; total N = 679) we found a three‐factor structure, with the additional containing items related to social relationships. Further, Fijians’ responses revealed a different three‐factor structure for human minds and gods’ minds. We used these factors as dimensions in the conception of minds to predict (a) expectations about human and divine tendencies towards punishment and reward; and (b) conception of gods as more embodied (an extension of experience) or more able to know people's thoughts (an extension of agency). We found variation in how these factors predict conceptions of agents across groups, indicating further theory is needed to explain how culturally generated concepts of mind lead to other sorts of social inferences. We conclude that mind perception is shaped by culturally defined social expectations and recommend further work in different cultural contexts to examine the interplay between culture and social cognition.
Abstract: Previous research suggests that how people conceive of minds depends on the culture in which they live, both in determining how they interact with other human minds and how they infer the unseen minds of gods. We use exploratory factor analysis to compare how people from different societies with distinct models of human minds and different religious traditions perceive the minds of humans and gods. In two North American samples (American adults, N = 186; Canadian students, N = 202), we replicated a previously found two‐factor agency/experience structure for both human and divine minds, but in Fijian samples (Indigenous iTaukei Fijians, N = 77; Fijians of Indian descent, N = 214; total N = 679) we found a three‐factor structure, with the additional containing items related to social relationships. Further, Fijians’ responses revealed a different three‐factor structure for human minds and gods’ minds. We used these factors as dimensions in the conception of minds to predict (a) expectations about human and divine tendencies towards punishment and reward; and (b) conception of gods as more embodied (an extension of experience) or more able to know people's thoughts (an extension of agency). We found variation in how these factors predict conceptions of agents across groups, indicating further theory is needed to explain how culturally generated concepts of mind lead to other sorts of social inferences. We conclude that mind perception is shaped by culturally defined social expectations and recommend further work in different cultural contexts to examine the interplay between culture and social cognition.
Additional siblings reduce wealth by about 38%; effect is more negatively associated with filial wealth with wealthier parents; contribution to population-level inequalities aside other socio-economic characteristics
Fewer Siblings, More Wealth? Sibship Size and Wealth Attainment. Philipp M. Lersch. European Journal of Population, https://link.springer.com/article/10.1007/s10680-018-09512-x
Abstract: This study examines the association between sibship size and wealth in adulthood. The study draws on resource dilution theory and additionally discusses potentially wealth-enhancing consequences of having siblings. Data from the German Socio-Economic Panel Study (SOEP, N = 3502 individuals) are used to estimate multilevel regression models adjusted for concurrent parental wealth and other important confounders neglected in extant work. The main results of the current study show that additional siblings reduce wealth by about 38%. Parental wealth moderates the association so that sibship size is more negatively associated with filial wealth when parents are wealthier. Birth order position does not moderate the association between sibship size and wealth. The findings suggest that fertility in the family of origin has a systematic impact on wealth attainment and may contribute to population-level wealth inequalities independently from other socio-economic characteristics in families of origin such as parental wealth.
Abstract: This study examines the association between sibship size and wealth in adulthood. The study draws on resource dilution theory and additionally discusses potentially wealth-enhancing consequences of having siblings. Data from the German Socio-Economic Panel Study (SOEP, N = 3502 individuals) are used to estimate multilevel regression models adjusted for concurrent parental wealth and other important confounders neglected in extant work. The main results of the current study show that additional siblings reduce wealth by about 38%. Parental wealth moderates the association so that sibship size is more negatively associated with filial wealth when parents are wealthier. Birth order position does not moderate the association between sibship size and wealth. The findings suggest that fertility in the family of origin has a systematic impact on wealth attainment and may contribute to population-level wealth inequalities independently from other socio-economic characteristics in families of origin such as parental wealth.
Some reaction time studies report faster responses when responses to temporal information are arranged in a spatially congruent manner; due to cultural localization of temporal information in a mental timeline
The Space–Time Congruency Effect: A Meta‐Analysis. Linda von Sobbe, Edith Scheifele, Claudia Maienborn, Rolf Ulrich. Cognitive Science, https://doi.org/10.1111/cogs.12709
Abstract: Several reaction time (RT) studies report faster responses when responses to temporal information are arranged in a spatially congruent manner than when this arrangement is incongruent. The resulting space–time congruency effect is commonly attributed to a culturally salient localization of temporal information along a mental timeline (e.g., a mental timeline that runs from left to right). The present study aims to provide a compilation of the published RT studies on this time–space association in order to estimate the size of its effect and the extent of potential publication bias in this field of research. In this meta‐analysis, three types of task are distinguished due to hitherto existing empirical findings. These findings suggest that the extent to which time is made relevant to the experimental task has a systematic impact on whether or not the mental timeline is activated. The results of this meta‐analysis corroborate these considerations: First, experiments that make time a task‐relevant dimension have a mean effect size of d = 0.46. Second, in experiments in which time is task irrelevant, the effect size does not significantly deviate from zero. Third, temporal priming studies have a surprisingly high mean effect size of d = 0.47, which, however, should be adjusted to d = 0.36 due to publication bias.
Abstract: Several reaction time (RT) studies report faster responses when responses to temporal information are arranged in a spatially congruent manner than when this arrangement is incongruent. The resulting space–time congruency effect is commonly attributed to a culturally salient localization of temporal information along a mental timeline (e.g., a mental timeline that runs from left to right). The present study aims to provide a compilation of the published RT studies on this time–space association in order to estimate the size of its effect and the extent of potential publication bias in this field of research. In this meta‐analysis, three types of task are distinguished due to hitherto existing empirical findings. These findings suggest that the extent to which time is made relevant to the experimental task has a systematic impact on whether or not the mental timeline is activated. The results of this meta‐analysis corroborate these considerations: First, experiments that make time a task‐relevant dimension have a mean effect size of d = 0.46. Second, in experiments in which time is task irrelevant, the effect size does not significantly deviate from zero. Third, temporal priming studies have a surprisingly high mean effect size of d = 0.47, which, however, should be adjusted to d = 0.36 due to publication bias.
These findings underscore the contributions of heritable influences to the associations between parenting & virtuous character that have previously been assumed to be only environmentally influenced
Did I Inherit My Moral Compass? Examining Socialization and Evocative Mechanisms for Virtuous Character Development. Amanda M. Ramos, Amanda M. Griffin, Jenae M. Neiderhiser, David Reiss. Behavior Genetics, https://link.springer.com/article/10.1007/s10519-018-09945-4
Abstract: Virtuous character development in children is correlated with parenting behavior, but the role of genetic influences in this association has not been examined. Using a longitudinal twin/sibling study (N = 720; Time 1 (T1) Mage = 12–14 years, Time 3 (T3) Mage = 25–27 years), the current report examines associations among parental negativity/positivity and offspring responsibility during adolescence, and subsequent young adult conscientiousness. Findings indicate that associations among parental negativity and offspring virtuous character during adolescence and young adulthood are due primarily to heritable influences. In contrast, the association between concurrent parental positivity and adolescent responsibility was due primarily to heritable and shared environmental influences. These findings underscore the contributions of heritable influences to the associations between parenting and virtuous character that have previously been assumed to be only environmentally influenced, emphasizing the complexity of mechanisms involved in the development of virtuous character.
Abstract: Virtuous character development in children is correlated with parenting behavior, but the role of genetic influences in this association has not been examined. Using a longitudinal twin/sibling study (N = 720; Time 1 (T1) Mage = 12–14 years, Time 3 (T3) Mage = 25–27 years), the current report examines associations among parental negativity/positivity and offspring responsibility during adolescence, and subsequent young adult conscientiousness. Findings indicate that associations among parental negativity and offspring virtuous character during adolescence and young adulthood are due primarily to heritable influences. In contrast, the association between concurrent parental positivity and adolescent responsibility was due primarily to heritable and shared environmental influences. These findings underscore the contributions of heritable influences to the associations between parenting and virtuous character that have previously been assumed to be only environmentally influenced, emphasizing the complexity of mechanisms involved in the development of virtuous character.
Wednesday, January 16, 2019
From 1992: A proposal to classify happiness as a psychiatric disorder
A proposal to classify happiness as a psychiatric disorder. R P Bentall. J Med Ethics. 1992 Jun; 18(2): 94–98. https://www.ncbi.nlm.nih.gov/pubmed/1619629
Abstract: It is proposed that happiness be classified as a psychiatric disorder and be included in future editions of the major diagnostic manuals under the new name: major affective disorder, pleasant type. In a review of the relevant literature it is shown that happiness is statistically abnormal, consists of a discrete cluster of symptoms, is associated with a range of cognitive abnormalities, and probably reflects the abnormal functioning of the central nervous system. One possible objection to this proposal remains--that happiness is not negatively valued. However, this objection is dismissed as scientifically irrelevant.
Abstract: It is proposed that happiness be classified as a psychiatric disorder and be included in future editions of the major diagnostic manuals under the new name: major affective disorder, pleasant type. In a review of the relevant literature it is shown that happiness is statistically abnormal, consists of a discrete cluster of symptoms, is associated with a range of cognitive abnormalities, and probably reflects the abnormal functioning of the central nervous system. One possible objection to this proposal remains--that happiness is not negatively valued. However, this objection is dismissed as scientifically irrelevant.
Health and Wealth in the Roman Empire: Romans paid a health price for their material wealth, their bones are smaller in the period of more power
Health and Wealth in the Roman Empire. Willem M. Jongman, Jan P.A.M.Jacobs Geertje, M. KleinGoldewijk. Economics & Human Biology, https://doi.org/10.1016/j.ehb.2019.01.005
Highlights
• We present the largest dataset of skeletal data for Roman history.
• We do not attempt to reconstruct stature, but opt for trends in factor scores.
• We find a downward trend until the first century AD, and improvement thereafter.
• Our measure correlates negatively with population, but also with wages or diets.
• Romans paid a health price for their material wealth.
Abstract: Ancient Rome was the largest and most populous empire of its time, and the largest pre-industrial state in European history. Recent though not universally accepted research suggests that at least for the most populous central periods of its history standard of living was also rather higher than before or after. To trace whether this is also reflected in Roman biological standard of living, we present the first large and more or less comprehensive dataset, based on skeletal data for some 10,000 individuals, covering all periods of Roman history, and all regions (even if inevitably unequally). We discuss both the methodologies that we developed and the historical results. Instead of reconstructing heights from the long bones assuming fixed body proportions or from one individual long bone, we apply exploratory factor analysis and calculate factor scores for 50-year periods. Our measure of the biological standard of living declined during the last two centuries B.C. and started to improve again, slowly at first, from the second century A.D. It correlated negatively with population, but also with other aspects of standard of living such as wages or diets.
Highlights
• We present the largest dataset of skeletal data for Roman history.
• We do not attempt to reconstruct stature, but opt for trends in factor scores.
• We find a downward trend until the first century AD, and improvement thereafter.
• Our measure correlates negatively with population, but also with wages or diets.
• Romans paid a health price for their material wealth.
Abstract: Ancient Rome was the largest and most populous empire of its time, and the largest pre-industrial state in European history. Recent though not universally accepted research suggests that at least for the most populous central periods of its history standard of living was also rather higher than before or after. To trace whether this is also reflected in Roman biological standard of living, we present the first large and more or less comprehensive dataset, based on skeletal data for some 10,000 individuals, covering all periods of Roman history, and all regions (even if inevitably unequally). We discuss both the methodologies that we developed and the historical results. Instead of reconstructing heights from the long bones assuming fixed body proportions or from one individual long bone, we apply exploratory factor analysis and calculate factor scores for 50-year periods. Our measure of the biological standard of living declined during the last two centuries B.C. and started to improve again, slowly at first, from the second century A.D. It correlated negatively with population, but also with other aspects of standard of living such as wages or diets.
More likely to stick with initial decisions, no matter which reasons are considered; this resistance to belief change is likely due to a motivated, biased evaluation of the reasons to support their initial beliefs (prior-belief bias)
Resistance to Position Change, Motivated Reasoning, and Polarization. Matthew L. Stanley, Paul Henne, Brenda W. Yang, Felipe De Brigard. Political Behavior, https://link.springer.com/journal/11109
Abstract: People seem more divided than ever before over social and political issues, entrenched in their existing beliefs and unwilling to change them. Empirical research on mechanisms driving this resistance to belief change has focused on a limited set of well-known, charged, contentious issues and has not accounted for deliberation over reasons and arguments in belief formation prior to experimental sessions. With a large, heterogeneous sample (N = 3001), we attempt to overcome these existing problems, and we investigate the causes and consequences of resistance to belief change for five diverse and less contentious socio-political issues. After participants chose initially to support or oppose a given socio-political position, they were provided with reasons favoring their chosen position (affirming reasons), reasons favoring the other, unchosen position (conflicting reasons), or all reasons for both positions (reasons for both sides). Our results indicate that participants are more likely to stick with their initial decisions than to change them no matter which reasons are considered, and that this resistance to belief change is likely due to a motivated, biased evaluation of the reasons to support their initial beliefs (prior-belief bias). More specifically, they rated affirming reasons more favorably than conflicting reasons—even after accounting for reported prior knowledge about the issue, the novelty of the reasons presented, and the reported strategy used to make the initial decision. In many cases, participants who did not change their positions tended to become more confident in the superiority of their positions after considering many reasons for both sides.
Abstract: People seem more divided than ever before over social and political issues, entrenched in their existing beliefs and unwilling to change them. Empirical research on mechanisms driving this resistance to belief change has focused on a limited set of well-known, charged, contentious issues and has not accounted for deliberation over reasons and arguments in belief formation prior to experimental sessions. With a large, heterogeneous sample (N = 3001), we attempt to overcome these existing problems, and we investigate the causes and consequences of resistance to belief change for five diverse and less contentious socio-political issues. After participants chose initially to support or oppose a given socio-political position, they were provided with reasons favoring their chosen position (affirming reasons), reasons favoring the other, unchosen position (conflicting reasons), or all reasons for both positions (reasons for both sides). Our results indicate that participants are more likely to stick with their initial decisions than to change them no matter which reasons are considered, and that this resistance to belief change is likely due to a motivated, biased evaluation of the reasons to support their initial beliefs (prior-belief bias). More specifically, they rated affirming reasons more favorably than conflicting reasons—even after accounting for reported prior knowledge about the issue, the novelty of the reasons presented, and the reported strategy used to make the initial decision. In many cases, participants who did not change their positions tended to become more confident in the superiority of their positions after considering many reasons for both sides.
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