The effects of alcohol and delta-9-tetrahydrocannabinol on human physical aggression

Forty male undergraduates were provoked following their ingestion of high or low doses of either alcohol or delta-9-tetrahydrocannabinol (THC). The expression of physical aggression was related to the quantity of alcohol ingested. The high dose of alcohol instigated more intense aggression than the low dose. The high dose of THC, on the other hand, did not increase aggressive behavior. In fact, it tended to produce a weak suppression effect.     

The effects of marijuana on human physical aggression

Thirty male undergraduates received intense provocation following their ingestion of one of three doses of delta-9-tetrahydrocannabinol (THC). The subjects in the low-dose condition tended to respond in a more aggressive manner than the subjects in the moderate-and high-dose conditions. The subjects in the high-dose condition behaved in a relatively nonaggressive manner throughout the experimental session.     

Media depictions of physical and relational aggression: connections with aggression in young adults' romantic relationships

Various studies have found that viewing physical or relational aggression in the media can impact subsequent engagement in aggressive behavior. However, this has rarely been examined in the context of relationships. Accordingly, the aim of this study was to examine the connection between viewing various types of aggression in the media and perpetration of aggression against a romantic partner. A total of 369 young adults completed a variety of questionnaires asking for their perpetration of various forms of relationship aggression. Participants' exposure to both physical and relational aggression in the media was also assessed. As a whole, we found a relationship between viewing aggression in the media and perpetration of aggression; however, this depended on the sex of the participant and the type of aggression measured. Specifically, exposure to physical violence in the media was related to engagement in physical aggression against their partner only for men. However, exposure to relational aggression in the media was related to romantic relational aggression for both men and women.     

Effects of type and dose of alcohol on human physical aggression.

Forty male undergraduates over 21 years of age were provoked following their ingestion of either 1.5 ounces (.045 1) or .5 ounces (.015 1) of 100 proof bourbon or vodka per 40 (18 kg) of body weight. The expression of physical aggression was related to the quantity of alcohol ingested. The high dose of alcohol appeared to instigate and the low dose of alcohol appeared to inhibit aggressive responding. This effect was most pronounced in the vodka conditions. Interpersonal judgments were also influenced by the type and dose of alcohol consumed.     

Reactive and proactive aggression: predictions to physical violence in different contexts and moderating effects of parental monitoring and caregiving behavior

This study aimed at (a) comparing the links of proactive and reactive aggression at 13 years of age to delinquency-related violence and dating violence at ages 16 and 17, and (b) examining the moderating effects of parental supervision, and mother's and father's warmth and caregiving behaviors on these links. Based on a sample of 525 Caucasian boys, the results showed that proactive aggression uniquely predicted delinquency-related violence, whereas reactive aggression uniquely predicted later dating violence. The relation between proactive aggression and delinquency-related violence, however, was moderated by parental supervision. The relation between reactive aggression and dating violence was moderated by mother's warmth and caregiving behavior. The implications of the findings for the theoretical and practical distinction between proactive and reactive aggression are discussed.     

The development of social aggression and physical aggression: A narrative analysis of interpersonal conflicts

Using conflict narratives reported by children and adolescents, this study investigated the development and social functions of social aggression in comparison to physical aggression. A total of 510 participants in two cohorts of a longitudinal study were involved (116 girls and 104 boys from Grade 4 and155 girls and 135 boys from Grade 7). Patterns of social aggression and physical aggression were identified based on interview reports in the first year of the study. Results showed that a triadic structure of social relationship was often reported in conflicts where social aggression was employed, whereas a dyadic structure was reported in conflicts involving physical aggression. Girls tended to use social aggression against girls, whereas boys tended to use physical aggression against boys. Children and adolescents who were central in peer social networks were more likely to employ social aggression than those who were peripheral in the networks. Social aggression was not reliably linked to concurrent or future problematic adjustment. Physical aggression, however, was not related to network centrality but was linked to concurrent and future maladjustment (e.g., low academic competence and school dropout). Aggr. Behav. 28:341–355, 2002. © 2002 Wiley‐Liss, Inc.     

The Effectiveness of Substance Abuse Treatment in Reducing Violent Behavior

The use of alcohol and other drugs has long been associated with violence. Yet relatively little is known about the effect of treatment on specific violent behaviors. This study examines violent behaviors in the National TreatmentImprovement Evaluation Study (NTIES), and assesses the extent to which treatment appears to reduce violence for each measured behavior. It also examines these reductions by gender, treatment modality, and whether the client wasa victim of violence in addition to being a perpetrator. The results indicate large reductions in violence among clients actively violent during the pretreatment period, with virtually no increase in violence among clients not actively violent during that same period, irrespective of gender, modality, or victimization status. On their face, the results strongly suggest that substance abuse treatment is effective in reducing violent behavior. Alternative explanations areproposed and assessed, followed by implications for policy, practice, and future research.     

Alcohol-aggression expectancies and dispositional rumination moderate the effect of alcohol consumption on alcohol-related aggression and hostility

Alcohol consumption increases aggression, but only in some drinkers. This study extends previous work to show how expectancies for alcohol-induced aggression and dispositional rumination moderate the link between alcohol consumption and alcohol-related aggression and hostility in a sample of 285 men and women. Alcohol-aggression expectancies and quantity of alcohol interacted to predict alcohol-related hostility and aggression. Trait rumination moderated the effect of alcohol consumption on aggressive acts. Finally, women who ruminated were more likely to report alcohol-related aggression than were men who ruminated. These results suggest that alcohol expectancies for aggression and rumination constitute two important cognitive facilitators of alcohol-related aggression and hostility, and that gender plays an important role in these relations.     

Media violence, physical aggression, and relational aggression in school age children: a short-term longitudinal study

Many studies have shown that media violence has an effect on children's subsequent aggression. This study expands upon previous research in three directions: (1) by examining several subtypes of aggression (verbal, relational, and physical), (2) by measuring media violence exposure (MVE) across three types of media, and (3) by measuring MVE and aggressive/prosocial behaviors at two points in time during the school year. In this study, 430 3rd-5th grade children, their peers, and their teachers were surveyed. Children's consumption of media violence early in the school year predicted higher verbally aggressive behavior, higher relationally aggressive behavior, higher physically aggressive behavior, and less prosocial behavior later in the school year. Additionally, these effects were mediated by hostile attribution bias. The findings are interpreted within the theoretical framework of the General Aggression Model.     

Alcohol‐aggression expectancies and dispositional aggression moderate the relationship between alcohol consumption and alcohol‐related violence

Alcohol consumption increases aggression, but only in some drinkers. This study examines how expectancies for alcohol‐induced aggression and dispositional aggression moderate the link between alcohol consumption and alcohol‐related violence, building on previous studies that have employed limited measures of alcohol‐related violence and included few women. A sample of 212 men and women reported their alcohol consumption, alcohol‐aggression expectancies, dispositional aggression, and incidents of alcohol‐related aggressive acts. Alcohol‐aggression expectancies and quantity of alcohol consumed interacted to predict alcohol‐related aggression. Alcohol‐aggression expectancies covaried with alcohol‐related aggressive acts, particularly in heavier drinkers. Dispositional aggression also correlated with alcohol‐related aggression among heavier drinkers. These results help identify that alcohol might increase aggression only among heavy drinkers who expect alcohol to increase aggression or who are dispositionally aggressive. Aggr. Behav. 32:517–527, 2006. © 2006 Wiley‐Liss, Inc.     

The longitudinal association between social status insecurity and relational aggression: Moderation effects of social cognition about relational aggression

Previous research has shown that adolescents’ insecurity about their social status is related to their use of relational aggression. However, little is known about how adolescents’ social cognition may moderate this association. Employing a mixed-method approach and a short-term longitudinal design, this study addresses this issue by examining the moderation effects of attribution and outcome expectancies regarding relational aggression on the associations between social status insecurity and relational aggression among 476 Chinese adolescents (238 girls). The main results showed that self-serving attributions and instrumental outcome expectancies strengthened the positive and longitudinal association between social status insecurity and self-reported relational aggression. The findings of this study enrich our knowledge about the social cognitive processes pertinent to peer status and relational aggression among adolescents.     

The effects of alcohol and the salience of aggressive cues on triggered displaced aggression

Alcohol increases the aggression-augmenting effects of provocation. Theories of alcohol and aggression suggest that impaired cognitive processing induced by acute intoxication leads individuals to process aggression-inducing social cues differently depending on whether they are high or low in salience. We examined the effects of intoxication and aggressive cue salience within the triggered displaced aggression paradigm. An ethnically diverse sample of 74 primarily young adult participants (40 men and 34 women; M=23.28, SD=3.14 years) were recruited from the university community and surrounding area. All participants were provoked by an experimenter, randomly assigned to a 2 (alcohol condition: alcohol vs. placebo) x 2 (trigger salience: high vs. low salience) between-subjects design, and then given the opportunity to aggress against the undeserving triggering agent. As expected, intoxication combined with a salient triggering cue elicited the most displaced aggression among all conditions. These results provide the first evidence that the effect of alcohol on triggered displaced aggression is moderated by the salience of the triggering event.     

Empathy and risk status for child physical abuse: the effects of an adult victim's pain cues and an adult victim's intent on aggression

It has been proposed that abusive parents and parents at high risk for child physical abuse could be more likely to view children's behavior as being motivated by hostile intent [e.g., Milner, 1993], as compared to nonabusive and low‐risk parents. This kind of misattribution of other's behavior may inhibit empathic emotion, and therefore, could block the inhibiting effect of a victim's pain cues on aggression [Baron, 1979]. An experiment was designed to analyze the moderating effect of an adult victim's intent on aggression in high‐ and low‐risk participants for child physical abuse. A 2 × 2 factorial design based upon two levels of the participant's risk status (high, low) and two levels of victim's intent (positive, ambiguous) was employed. All participants observed an adult victim's pain cues. Ninety‐five (48 high and 47 low risk for child physical abuse) undergraduate females enrolled in courses at the University of the Basque Country participated in the experiment. The main effects of victims' intent and of participants' risk status were statistically significant. Participants in the ambiguous victim's intent condition aggressed significantly more than participants in the positive victim's intent condition. Moreover, high‐risk participants aggressed more than low‐risk participants regardless of the victim's intent. A significant interaction between risk status and victim's intent was expected. High‐risk subjects for child physical abuse were expected to aggress more than low‐risk subjects only in the ambiguous victim's intent condition. However, results did not support this hypothesis. Aggr. Behav. 32:1–12, 2006. © 2006 Wiley‐Liss, Inc.     

The effects of social pressure on group recall

In two experiments, individual subjects worked in conjunction with two perceived group members to recall six 30-item categorized word lists. The perceived group members' recall levels were manipulated to establish either high or low group standards. After participating in the perceived group, subjects completed a surprise final individual recall test that covered all of the presented material. On the basis of the hypothesis that the subjects' performance would be affected by social pressure, it was predicted that subjects working in high-performing groups would recall more words than subjects working in low-performing groups on both the group recall tests and the final individual recall test. These predicted results were observed. Thus, a complete analysis of the group recall environment should include a consideration of conformity theory whereby subjects' memories can be affected by their group members' output levels.