Aggression
Testosterone Affects Gaze Aversion from Angry Faces Outside of Conscious Awareness
David Terburg, Henk Aarts & Jack van Honk
Psychological Science, forthcoming
Abstract:
Throughout vertebrate phylogeny, testosterone has motivated animals to obtain and maintain social dominance - a fact suggesting that unconscious primordial brain mechanisms are involved in social dominance. In humans, however, the prevailing view is that the neocortex is in control of primordial drives, and testosterone is thought to promote social dominance via conscious feelings of superiority, indefatigability, strength, and anger. Here we show that testosterone administration in humans prolongs dominant staring into the eyes of threatening faces that are viewed outside of awareness, without affecting consciously experienced feelings. These findings reveal that testosterone motivates social dominance in humans in much the same ways that it does in other vertebrates: involuntarily, automatically, and unconsciously.
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Revenge without responsibility? Judgments about collective punishment in baseball
Fiery Cushman, A.J. Durwin & Chaz Lively
Journal of Experimental Social Psychology, forthcoming
Abstract:
Many cultures practice collective punishment; that is, they will punish one person for another's transgression, based solely on shared group membership. This practice is difficult to reconcile with the theories of moral responsibility that dominate in contemporary Western psychology, philosophy and law. Yet, we demonstrate a context in which many American participants do endorse collective punishment: retaliatory "beaning" in baseball. Notably, individuals who endorse this form of collective punishment tend not to hold the target of retaliation to be morally responsible. In other words, the psychological mechanisms underlying such "vicarious" forms of collective punishment appear to be distinct from the evaluation of moral responsibility. Consequently, the observation of collective punishment in non-Western cultures may not indicate the operation of fundamentally different conceptions of moral responsibility.
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Sarah Coyne et al.
British Journal of Social Psychology, March 2012, Pages 188-196
Abstract:
The current research consisted of two studies examining the effects of reading physical and relational aggression in literature. In both studies, participants read one of two stories (containing physical or relational aggression), and then participated in one of two tasks to measure aggression. In Study 1, participants who read the physical aggression story were subsequently more physically aggressive than those who read the relational aggression story. Conversely, in Study 2, participants who read the relational aggression story were subsequently more relationally aggressive than those who read the physical aggression story. Combined, these results show evidence for specific effects of reading aggressive content in literature.
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Mean on the Screen: Social Aggression in Programs Popular with Children
Nicole Martins & Barbara Wilson
Journal of Communication, forthcoming
Abstract:
A content analysis was conducted to examine the portrayal of social aggression in the 50 most popular television programs among 2- to 11-year-old children. Results revealed that 92% of the programs in the sample contained some social aggression. On average, there were 14 different incidents of social aggression per hour in these shows, or one every 4 minutes. Compared to the portrayals of physical aggression, social aggression was more likely to be enacted by an attractive perpetrator, to be featured in a humorous context, and neither rewarded or punished. In these ways, social aggression on television poses more of a risk for imitation and learning than do portrayals of physical aggression. Findings are discussed in terms of social cognitive theory.
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Youssef Hasan, Laurent Bègue & Brad Bushman
Journal of Experimental Social Psychology, forthcoming
Abstract:
Research has clearly shown that violent video games can increase aggression. It is less clear why they do. This study investigates the mediating effect of the hostile expectation bias (i.e., tendency to perceive hostile intent on the part of others) on the link between violent video game exposure and aggression. French college students (N = 136) played either a violent or nonviolent game for 20 minutes. Afterwards, they read ambiguous story stems about potential interpersonal conflicts, and listed what they thought the main characters would do or say, think, and feel as the story continued. Next, they played a competitive computer game in which the winner could blast the loser with loud noise through headphones. As hypothesized, video game violence increased the hostile expectation bias, which, in turn, increased aggressive behavior. Effects were larger for men than women. Thus one reason why violent games increase aggression is because they increase hostile expectations.
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Benjamin Trumble et al.
Proceedings of the Royal Society: Biological Sciences, forthcoming
Abstract:
The challenge hypothesis posits that acute increases in testosterone (T) during male-male competition enhance performance and survivability while limiting the physiological costs of consistently high T. Human challenge hypothesis research focuses on young men in industrial populations, who have higher baseline T levels than men in subsistence populations. We tested whether the Tsimane, pathogenically stressed forager-horticulturalists of the Bolivian Amazon, would express acute T increases in response to physical competition. Saliva was collected from 88 Tsimane men (aged 16-59 years) before and after a competitive soccer match. Tsimane men had significantly lower baseline levels of T (β = -0.41, p < 0.001) when compared with age-matched United States (US) males. Linear mixed-effects models were used to establish that T increased significantly immediately following competition (β = 0.23, p < 0.001), remaining high 1 h later (β = 0.09, p = 0.007); equivalent to 30.1 and 15.5 per cent increases in T, respectively. We did not find larger increases in T among winners (p = 0.412), although T increases were positively associated with self-rated performance (β = 9.07, p = 0.004). These results suggest that despite lower levels of T than US males, Tsimane males exhibit acute increases in T at the same relative magnitude reported by studies in industrialized settings, with larger increases in T for those who report better individual performance.
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Caffeine expectancies but not caffeine reduce depletion-induced aggression
Thomas Denson et al.
Psychology of Addictive Behaviors, March 2012, Pages 140-144
Abstract:
Caffeine is the most widely consumed central nervous system stimulant in the world, yet little is known about its effects on aggressive behavior. Individuals often consume caffeine to increase energy and ward off mental depletion. Because mental depletion increases aggression when people are provoked, caffeine might reduce aggression by ameliorating the negative effects of depletion. In 2 experiments, participants consumed a 200-mg caffeine tablet or a placebo, were mentally depleted or not, and then provoked and given the opportunity to retaliate with a blast of white noise. Results showed that consuming a placebo reduced aggression relative to both caffeine (Experiments 1 and 2) and a no-pill control condition (Experiment 2). These data suggest that expectancies about the effects of caffeine in the absence of the pharmacological effects of the drug can reduce aggression when mentally depleted.
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Trans Fat Consumption and Aggression
Beatrice Golomb et al.
PLoS ONE, March 2012
Background: Dietary trans fatty acids (dTFA) are primarily synthetic compounds that have been introduced only recently; little is known about their behavioral effects. dTFA inhibit production of omega-3 fatty acids, which experimentally have been shown to reduce aggression. Potential behavioral effects of dTFA merit investigation. We sought to determine whether dTFA are associated with aggression/irritability.
Methodolgy/Prinicpal Findings: We capitalized on baseline dietary and behavioral assessments in an existing clinical trial to analyze the relationship of dTFA to aggression. Of 1,018 broadly sampled baseline subjects, the 945 adult men and women who brought a completed dietary survey to their baseline visit are the target of this analysis. Subjects (seen 1999-2004) were not on lipid medications, and were without LDL-cholesterol extremes, diabetes, HIV, cancer or heart disease. Outcomes assessed adverse behaviors with impact on others: Overt Aggression Scale Modified-aggression subscale (primary behavioral endpoint); Life History of Aggression; Conflict Tactics Scale; and self-rated impatience and irritability. The association of dTFA to aggression was analyzed via regression and ordinal logit, unadjusted and adjusted for potential confounders (sex, age, education, alcohol, and smoking). Additional analyses stratified on sex, age, and ethnicity, and examined the prospective association. Greater dTFA were strongly significantly associated with greater aggression, with dTFA more consistently predictive than other assessed aggression predictors. The relationship was upheld with adjustment for confounders, was preserved across sex, age, and ethnicity strata, and held cross-sectionally and prospectively.
Conclusions/Significance: This study provides the first evidence linking dTFA with behavioral irritability and aggression. While confounding is always a concern in observational studies, factors including strength and consistency of association, biological gradient, temporality, and biological plausibility add weight to the prospect of a causal connection. Our results may have relevance to public policy determinations regarding dietary trans fats.
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Dominik Mischkowski, Ethan Kross & Brad Bushman
Journal of Experimental Social Psychology, forthcoming
Abstract:
People tend to ruminate after being provoked, which is like using gasoline to put out a fire - it feeds the flame by keeping aggressive thoughts and angry feelings active. In contrast, reflecting over past provocations from a self-distanced or "fly on the wall" perspective reduces aggressive thoughts and angry feelings. However, it is unclear whether people can self-distance "in the heat of the moment" (i.e., immediately after being provoked), and if they can, whether doing so reduces actual aggressive behavior. Two experiments addressed these issues. The results indicated that provoked participants who self-distanced had fewer aggressive thoughts and angry feelings (Experiment 1) and displayed less aggressive behavior (Experiment 2) than participants who self-immersed or were in a control group. These findings demonstrate that people can self-distance in the heat of the moment, and that doing so reduces aggressive thoughts, angry feelings, and aggressive behavior.
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Video game playing, attention problems, and impulsiveness: Evidence of bidirectional causality
Douglas Gentile et al.
Psychology of Popular Media Culture, January 2012, Pages 62-70
Abstract:
The present study examines video game playing as it relates to attention problems and impulsiveness in a sample of 3,034 children and adolescents from Singapore measured over 3 years. Consistent with previous research, those who spend more time playing video games subsequently have more attention problems, even when earlier attention problems, sex, age, race, and socioeconomic status are statistically controlled. Violent content may have a unique effect on attention problems and impulsiveness, but total time spent with video games appears to be a more consistent predictor. Individuals who are more impulsive or have more attention problems subsequently spend more time playing video games, even when initial video game playing is statistically controlled, suggesting bidirectional causality between video game playing and attention problems/impulsiveness.
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Neil Malamuth, Gert Martin Hald & Mary Koss
Sex Roles, April 2012, Pages 427-439
Abstract:
Based on the Confluence Model of Sexual Aggression, we hypothesized that individual differences in risk for sexual aggression moderate the association between pornography use and attitudes supporting violence against women. This hypothesis was in keeping with the findings of a recent meta-analysis which indicated such a positive association between porn use and attitudes. However, in this meta-analysis there was also a high degree of heterogeneity among studies, suggesting the existence of crucial moderating variables. Unfortunately, the available literature included in this meta-analysis did not enable identifying the basis for such moderation. To fully test our hypothesis of individual differences moderation and related hypotheses requires a representative sample. Fortunately, a unique nationally representative sample of U.S. men in any form of post-high school education that we obtained in 1984-85 enabled testing our predictions. Participants had anonymously completed questionnaires that included items pertaining to pornography use, attitudes about violence against women, and other measures assessing risk factors highlighted by the Confluence Model. As predicted, while we found an overall positive association between pornography consumption and attitudes, further examination showed that it was moderated by individual differences. More specifically, as predicted this association was found to be largely due to men at relatively high risk for sexually aggression who were relatively frequent pornography consumers. The findings help resolve inconsistencies in the literature and are in line not only with experimental research on attitudes but also with both experimental and non-experimental studies assessing the relationship between pornography consumption and sexually aggressive behavior.
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Ligia Kiss et al.
Social Science & Medicine, April 2012, Pages 1172-1179
Abstract:
This study investigates the influence of neighbourhood socioeconomic conditions on women's likelihood of experiencing intimate partner violence (IPV) in Sao Paulo, Brazil. Data from 940 women who were interviewed as part of the WHO multi-country study on women's health and domestic violence against women, and census data for Sao Paulo City, were analyzed using multilevel regression techniques. A neighbourhood socioeconomic-level scale was created, and proxies for the socioeconomic positions of the couple were included. Other individual level variables included factors related to partner's behaviour and women's experiences and attitudes. Women's risk of IPV did not vary across neighbourhoods in Sao Paulo nor was it influenced by her individual socioeconomic characteristics. However, women in the middle range of the socioeconomic scale were significantly more likely to report having experienced violence by a partner. Partner behaviours such as excessive alcohol use, controlling behaviour and multiple sexual partnerships were important predictors of IPV. A women's likelihood of IPV also increased if either her mother had experienced IPV or if she used alcohol excessively. These findings suggest that although the characteristics of people living in deprived neighbourhoods may influence the probability that a woman will experience IPV, higher-order contextual dynamics do not seem to affect this risk. While poverty reduction will improve the lives of individuals in many ways, strategies to reduce IPV should prioritize shifting norms that reinforce certain negative male behaviours.
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Stacy Tzoumakis, Patrick Lussier & Raymond Corrado
Behavioral Sciences & the Law, forthcoming
Abstract:
The current study explored the intergenerational transmission of aggression and antisocial behavior by examining mothers' juvenile delinquency, their pregnancies, and its impact on their children's aggressive behavior. The sample consisted of the first 181 biological mothers recruited as part of the Vancouver Longitudinal Study on the Psychosocial Development of Children (British Columbia, Canada). Results indicated that mothers who were juvenile delinquents were more likely to experience social adversity, to use substances during pregnancy and to offend in adulthood. Furthermore, mothers who reported juvenile delinquency had children who were more physically aggressive and had an earlier onset of physical aggression. This pattern of association held when controlling for sociodemographics, social adversities, prenatal substance exposure, and criminal involvement in adulthood. The study findings highlighted the importance of understanding the role and impact of female delinquency and motherhood on the intergenerational transmission of antisocial behavior.