Links between self-reported media violence exposure and teacher ratings of aggression and prosocial behavior among German adolescents

The relations between adolescents’ habitual usage of media violence and their tendency to engage in aggressive and prosocial behavior in a school setting were examined in a cross-sectional study with 1688 7th and 8th graders in Germany who completed measures of violent media exposure and normative acceptance of aggression. For each participant, ratings of prosocial and aggressive behavior were obtained from their class teacher. Media violence exposure was a unique predictor of teacher-rated aggression even when relevant covariates were considered, and it predicted prosocial behavior over and above gender. Path analyses confirmed a direct positive link from media violence usage to teacher-rated aggression for girls and boys, but no direct negative link to prosocial behavior was found. Indirect pathways were identified to higher aggressive and lower prosocial behavior via the acceptance of aggression as normative. Although there were significant gender differences in media violence exposure, aggression, and prosocial behavior, similar path models were identified for boys and girls.     

Adolescents with Childhood ADHD and Comorbid Disruptive Behavior Disorders: Aggression, Anger, and Hostility

This study examined the self-reported expression of overt aggressive behaviors and covert emotional and cognitive processes in adolescents diagnosed with ADHD and comorbid disruptive behavior disorders (DBDs) during childhood. Methods: Participants were a clinically referred sample of 85 individuals diagnosed with ADHD, initially recruited in the early to mid 1990s when they were 7–11 years of age. At that time, 44 (52%) met criteria for a comorbid diagnosis of ODD and an additional 22 (26%) met criteria for a comorbid diagnosis of CD. Approximately 10 years later, these youth, along with an age-matched comparison sample (n = 83), were re-evaluated to assess a wide array of outcomes including physical and verbal aggression, anger, and hostility. Results: Individuals diagnosed with ADHD + CD in childhood reported elevated levels of physical aggression when compared to Controls and the ADHD-only group. Individuals diagnosed with ADHD + ODD had elevated levels of verbal aggression compared to Controls. Additionally, both comorbid groups experienced significantly greater amounts of anger, but not hostility, as compared to Controls. Importantly, the persistence of ADHD symptoms into adolescence accounted for most group differences in verbal aggression and anger at follow-up, but not physical aggression, which was accounted for by childhood CD. Conclusion: Adolescents diagnosed with ADHD and comorbid disruptive behavior disorders during childhood report high levels of aggression associated with increased emotionality in the form of anger, but not hostile cognitions. These findings suggest that in addition to inattention and hyperactivity/impulsivity, emotional dysregulation may be an important component of ADHD, particularly as it presents in adolescence.     

Relating testosterone levels and free play social behavior in male and female preschool children

This study assessed potential relationships between a series of behavioral measures seen in the interactions of preschool children with their peers (particularly aggressive behavior) and testosterone levels. 28 boys and 20 girls of preschool age were videotaped in free play interactions. Their behavior was then evaluated with particular emphasis on aggression and affiliation in play and social interactions. Testosterone levels were measured using radioimmunoassay in saliva samples. Correlation analysis revealed a positive relationship in boys between testosterone and giving and receiving aggression in the context of 'social interactions' (serious aggression), but not in the context of play (playful aggresstion). Testosterone can be a useful biological marker for serious aggression (and behavioral patterns reflecting different levels of sociability) in preschool boys.     

Normative beliefs as predictors of physical,non-physical and relational aggression among South African adolescents

This study investigated the contribution of general normative beliefs about aggression and specific normative beliefs about retaliatory aggression in predicting physical, non-physical and relational aggression. Adolescents (N = 229) from a low-income community in South Africa completed the Normative Beliefs about Aggression Scale (NOBAGS) and the Aggression–Problem Behaviour Frequency Scale (A–PBFS). The results revealed significantly higher levels of all forms of aggression amongst boys as compared to girls. There were significant gender differences in belief-behaviour associations with more significant correlations found among girls. General beliefs endorsing aggression were positively correlated with physical aggression among girls. For girls, beliefs about the acceptability of verbal and physical retaliation were associated with relational and non-physical aggression. The current findings broaden the understanding of the predictors of aggressive behaviour among South African youth. They emphasise that both general beliefs about aggression and specific beliefs about retaliation predict actual aggressive behaviour. Significantly, the study emphasizes that there are gender differences in the prediction of aggressive behaviour in terms of normative beliefs.     

Sex differences in childhood anger and aggression

There are few differences in the frequency or intensity of men's and women's self-reported or observed anger. Women are more likely to be angered by relationship conflicts than men. Men are more frequently the targets of anger than women. Typically, men see the expression of anger as exerting dominance, where as women view it as a loss of control. There are also sex differences in the mode of anger expression. At ages 8 and older, girls are more likely to engage in "relational" aggression (eg, deliberate social ostracism). The most consistent and salient difference in anger expression is women's tendency to cry when angry, whereas men are more likely to throw things or hit. The difference in physical aggression appears in children who are as young as 1 to 2 years of age. Despite an overall reduction in physical aggression after 2 to 3 years of age, the sex difference remains consistent into adulthood. In contrast to differences in physical aggression, differences in anger are few and inconsistent up to 4 or 5 years of age. By this age, girls tend to suppress the expression of anger consciously. By about 7 to 8 years of age, adult like differences become more consistent, with boys expressing more anger.     

Adrenal androgen and gonadal hormone levels in adolescent girls with conduct disorder

There are few data on the biological correlates of female antisocial behavior. This study compared adrenal androgen and gonadal hormone levels in adolescent girls with conduct disorder (CD) to girls without any psychiatric disorder (NC). We studied 87 girls, (47 CD; 36 NC), ages 15–17 years, obtaining three blood samples, drawn 20 min apart between 8 and 9 AM in the first 72 h of the onset of menstrual flow. Plasma was assayed for testosterone, estradiol, androstenedione, dehydroepiandrosterone (DHEA), dehydroepiandrosterone-sulfate (DHEA-S), sex hormone binding globulin (SHBG), and cortisol; area under the curve (AUC) for each of the three samples was used in the data analysis. We also calculated the Free Testosterone Index, Free Estrogen Index, Index of Hyperandrogenism and cortisol to DHEA ratio. In addition to receiving a full psychiatric interview, each girl completed a self-report questionnaire on general aggression. Main hormone analyses controlled for potentially confounding variables such as psychiatric comorbidity and race. Girls with CD had significantly lower cortisol to DHEA ratios, but did not differ from NC girls on any other hormone variable. Girls with symptoms of aggressive CD had significantly higher mean free testosterone indexes, lower SHBG levels, and lower cortisol to DHEA ratios than girls with non-aggressive CD. Girls with CD scored higher on the aggression questionnaire, but there was no association between general aggression and any hormone variable for the sample. Our data suggest that girls with CD, particularly aggressive CD, have lower cortisol to DHEA ratios, higher levels of free testosterone, and lower levels of SHBG. Clinical and research implications of these findings are discussed.     

The Influence of Aggressiveness on Rape-Myth Acceptance among University Students

The detrimental effects of rape are well established. In order to support victims of rape in reporting sexual assault, the factors which predict rape myths need to be investigated. Aggression has been linked to sexual violence, but little is known about the role of aggressive behaviour in rape-myth acceptance. The present study aimed to investigate whether rape myths could be predicted by verbal aggression, physical aggression, hostility, anger or sex in a sample of 121 participants. A regression analysis found that an individual's sex and self-reported physical aggression significantly predicted rape-myth acceptance.     

Reactive aggression among children with and without autism spectrum disorder

Twenty-seven boys and eight girls with ASD and thirty-five controls matched for gender, age and total score intelligence were studied to ascertain whether boys and girls with ASD display stronger reactive aggression than boys and girls without ASD. Participants performed a computerized version of the Pulkkinen aggression machine that examines the intensity of reactive aggression against attackers of varying gender and age. Relative to the control group boys, the boys with ASD reacted with more serious forms of aggression when subjected to mild aggressive attacks and did not consider a child attacker’s opposite sex an inhibitory factor. The girls with ASD, on the other hand, reacted less aggressively than the girls without ASD. According to the results boys with ASD may not follow the typical development in cognitive regulation of reactive aggression.     

Habitual somatic discomfort in a representative sample of adolescents.

The study is concerned with relations between habitual somatic discomfort, assessed by means of a questionnaire, and indicators of psychosocial adjustment, in a representative sample of 15-16 yr-old Finnish girls (N = 179) and boys (N = 205). Symptom prevalence was associated with anxiety, negative relations with parents, modest plans for education, fear of the future, loneliness, smoking, and drinking. These associations were significant for the boys but not for the girls. High symptom scores also tended to be associated with difficult peer relations (fighting, being target of peers' verbal aggression), and with the use of aggressive and the lack of constructive coping strategies in conflict situations. Boys who often felt lonely and girls who had been involved in physical fights with peers had consistently high scores. Different symptom patterns and sex differences are discussed.     

The involvement of serotonin and sex hormones in the generation of “killer rats”

An aggressive social environment induces chronic stress, pathological aggression, and the generation of killer rats. During natural or pilocarpine-induced aggression, serotonin content decreases by more than 50%. Aggression also correlates with quantitative alterations in the contents of male sex hormones. Specifically, castration of animals results in a significant attenuation of aggression, whereas injection of the male sex hormone testosterone leads to stimulation of aggressive behavior in rats. Rats that are tired after swimming in a pool exhibited substantially lower aggression. We can conclude that in order to avoid aggressive behavior in teenagers, physical activity should be included in intervals between lessons for neutralization of hormones and other biologically active agents that are directly related to formation of aggressive behavior.     

Structural and functional biomarkers of the insula subregions predict sex differences in aggression subscales

Aggression is a common and complex social behavior that is associated with violence and mental diseases. Although sex differences were observed in aggression, the neural mechanism for the effect of sex on aggression behaviors remains unclear, especially in specific subscales of aggression. In this study, we investigated the effects of sex on aggression subscales, gray matter volume (GMV), and functional connectivity (FC) of each insula subregion as well as the correlation of aggression subscales with GMV and FC. This study found that sex significantly influenced (a) physical aggression, anger, and hostility; (b) the GMV of all insula subregions; and (c) the FC of the dorsal agranular insula (dIa), dorsal dysgranular insula (dId), and ventral dysgranular and granular insula (vId_vIg). Additionally, mediation analysis revealed that the GMV of bilateral dIa mediates the association between sex and physical aggression, and left dId–left medial orbital superior frontal gyrus FC mediates the relationship between sex and anger. These findings revealed the neural mechanism underlying the sex differences in aggression subscales and the important role of the insula in aggression differences between males and females. This finding could potentially explain sexual dimorphism in neuropsychiatric disorders and improve dysregulated aggressive behavior.     

Sex differences in autonomic correlates of conduct problems and aggression

ObjectiveTo examine sex differences in autonomic nervous system functioning in children and adolescents with conduct problems and to evaluate the role of aggression in predicting autonomic nervous system functioning, over and above the effects of disruptive behavior. Although deficiencies in autonomic responding among boys with oppositional defiant disorder and/or conduct disorder are well documented, it remains unclear whether such findings extend to girls or apply only to children with aggressive forms of conduct problems.MethodElectrodermal responding, cardiac pre-ejection period, and respiratory sinus arrhythmia were recorded while boys (n = 110; 53 with conduct problems, 57 controls) and girls (n = 65; 33 with conduct problems, 32 controls) between the ages of 8 and 12 sat for an extended baseline, then played a game with conditions of reward and frustrative nonreward.ResultsBoth sex effects and aggression effects were found. Aggressive boys with conduct problems demonstrated reduced autonomic functioning, consistent with previous research. In contrast, aggressive girls with conduct problems exhibited greater electrodermal responding than controls, with no differences in cardiovascular reactivity to incentives.ConclusionsObserved sex differences in the autonomic correlates of conduct problems and aggression may suggest different etiological mechanisms of externalizing psychopathology for girls compared with boys. J. Am. Acad. Child Adolesc. Psychiatry, 2008; 47(7):788–796.     

Shenpa and Compassionate Abiding: Mindfulness-Based Practices for Anger and Aggression by Individuals with Schizophrenia

Uncontrolled anger is often expressed as verbal and physical aggression. Some people with schizophrenia engage in verbal and physical aggression when they cannot control their anger either through the use of psychotropic medication or psychosocial interventions. In this study, we taught three individuals with long-standing anger management problems the concept of shenpa—the almost instantaneous reaction of the mind to some internal or external stimulus that hooks them to a negative emotion—and a mindfulness-based practice that helped them to intuit this without attachment or anger. In addition, we taught them the mindfulness-based practice of compassionate abiding for dealing with emotionally arousing feelings that follow shenpa. Using a multiple baseline design, we assessed the effects of the two mindfulness-based practices on anger, verbal aggression and physical aggression. The three individuals were able to decrease their anger, greatly reduce verbal aggression, and virtually eliminate physical aggression.     

Social context in school: its relation to adolescents' depressive mood

This study examined the impact of various school-related factors on adolescents' depressive mood, including prosocial behavior, verbal aggression, and relationships with teachers. The data used in this study were collected in the context of a larger survey on victimization in secondary schools from the French Community of Belgium. Participants were 2896 secondary school students (1520 males; 1376 females) aged 12-18 years. Results showed that for both genders, the three strongest predictors of depressive mood were age, feeling of exclusion, and verbal aggression. This study focusing on school-related predictors of depressive mood confirmed the importance of the social context in school as a predictor of depression in both girls and boys.     

Anger control training for adolescents in residential treatment

A group of twelve adolescents exhibiting aggressive behavior in a residential treatment center received six weeks of anger control training consisting of thought stopping, relaxation training, and rehearsal of problem-solving, self-talk patterns. The subjects were divided into two groups, and a multiple baseline design was employed. Houseparents kept daily observational records of subjects' verbal and physical aggression. Both observational data and teacher ratings indicated that nine of the subjects reduced their rates of aggression. Two did not behave aggressively during the study period. One briefly deteriorated following a major disappointment, after which his aggression rate also declined.     

Prenatal exposure to testosterone and functional cerebral lateralization: a study in same-sex and opposite-sex twin girls

In animals it has been shown that exposure to sex hormones is influenced by intrauterine position. Thus fetuses located between two male fetuses are exposed to higher levels of testosterone (T) than fetuses situated between two female fetuses or one female and one male fetus. In a group of opposite-sex (OS) twin girls and same-sex (SS) twin girls a potential effect of prenatal exposure to testosterone (T) on functional cerebral lateralization was investigated. We hypothesized that prenatal exposure to T would result in a more masculine, i.e. a more lateralized pattern of cerebral lateralization in OS twin girls than in SS twin girls. An auditory-verbal dichotic listening task (DLT) was used as an indirect method to study hemispheric specialization. Firstly, we established a sex difference on the DLT. Compared with SS girls, OS twin boys showed a more lateralized pattern of processing verbal stimuli. Secondly, as predicted OS girls had a more masculine pattern of cerebral lateralization, than SS girls. These findings support the notion of an influence of prenatal T on early brain organization in girls.     

Exploring the Relationships of Perceived Discrimination, Anger, and Aggression among North American Indigenous Adolescents

A growing body of research has documented associations between discrimination, anger and delinquency, but the exact nature of these associations remains unclear. Specifically, do aggressive behaviors emerge over time as a consequence of perceived discrimination and anger? Or do adolescents who engage in aggressive behavior perceive that they are being discriminated against and become angry? We use autoregressive cross-lagged path analysis on a sample of 692 Indigenous adolescents (mean age=12 years) from the Northern Midwest and Canada to answer these research questions. Results showed that the direction of effects went only one way; both perceived discrimination and anger were significantly associated with subsequent aggression. Moreover, early discrimination and anger each had indirect effects on aggressive behavior three years later, and anger partially mediated the association between discrimination and aggression. Perceived discrimination is but one of many strains related to their unequal social position that these Indigenous youth experience, and have important implications for the proliferation of disparities in later life.     

Testosterone, antisocial behavior, and social dominance in boys: pubertal development and biosocial interaction.

BACKGROUND: Studies linking testosterone and antisocial behavior in humans have produced mixed results. Adolescence offers a promising period to study this relationship; circulating testosterone increases dramatically in boys during puberty, and antisocial behavior increases during the same period. METHODS: Our analyses were based on boys aged 9-15 years who were interviewed during the first three waves of the Great Smoky Mountains Study. Measures included interview assessment of DSM-IV conduct disorder (CD) symptoms and diagnosis, blood spot measurement of testosterone, Tanner staging of pubertal development, and assessment of leadership behaviors and peer deviance. RESULTS: The adolescent rise in CD was primarily attributable to an increase in nonphysically aggressive behaviors. Increasing levels of circulating testosterone and association with deviant peers contributed to these age trends. There was no evidence that physical aggression was related to high testosterone. Evidence of biosocial interactions was identified; testosterone was related to nonaggressive CD symptoms in boys with deviant peers and to leadership in boys with nondeviant peers. CONCLUSIONS: The results are consistent with the hypothesis that testosterone relates to social dominance, with the assumption that behaviors associated with dominance differ according to social context.     

The role of personality,family influences,and prosocial risk-taking behavior on substance use in early adolescence

Impulsivity is clearly associated with adolescent substance use. However, contemporary models of impulsivity argue against a unitary construct and propose at least two potential facets of impulsivity: reward drive and disinhibition. This study investigated the mediating role of prosocial risk-taking in the association between these two facets of impulsivity, family environment, and substance use in Grade 8 students, age 12–14 years (N = 969). For girls, traits related to disinhibition referred to as rash impulsivity were directly associated with greater substance use and, unexpectedly, reward drive was indirectly associated with greater substance use through participation in physical-risk activities, which itself predicted greater use. For boys, participation in physical-risk activities was the only direct predictor of substance use and, as in girls, reward drive conveyed indirect risk through this pathway. Family environment, reward drive, and rash impulsivity were associated with participation in performance-risk activities, and prosocial behavior more generally, but neither of these hypothesized mediators was related to substance use.     

The effects of single-sex versus coeducational schools on adolescent peer victimization and perpetration

Bullying is a growing public health concern for South Korean adolescents. In our quantitative investigation, we analyze the frequency with which Korean adolescents in single-sex versus coeducational schools are targets of or engage in three peer aggressive behaviors (verbal, relational (social exclusion), and physical (including theft)). We use two nationally representative datasets, the 2011 Trends in International Mathematics and Science Study (TIMSS) and the 2005 Korea Education Longitudinal Study (KELS), and rely on propensity score matching (PSM). For adolescent girls, we find that being in all-girls schools mitigates both their exposure to and engagement in peer victimization. For adolescent boys, we find that boys in all-boys schools have significantly higher odds of experiencing more frequent verbal and physical attacks versus their counterparts in coeducational schools. Our findings strongly suggest that interventions to mitigate peer victimization and aggression in Korea should consider the gendered schooling contexts in which they are implemented.