Background Aggression in residential youth care institutions is a frequent problem. Objective The present short-term longitudinal study examined individual and institutional predictors of aggression in a group of 198 adolescents placed in open, semi-secure and secure residential institutions from the perspective of the importation and deprivation model. Methods A total of 198 adolescents in...

This study examined three concurrent types of peer influence on the development of child aggression during the early elementary school years (grades 1-3): 1) low social preference among classmates, 2) friendships with aggressive peers, and 3) placement in a classroom characterized by high levels of peer aggression. This study drew from a large, diverse sample of 4096 children (from 27 schools a...

The majority of research on the link between video games and aggression has focused on the violent content in games. In contrast, recent experimental research suggests that it is video game competition, not violence, that has the greatest effect on aggression in the short-term. However, no researchers have examined the long-term relationship between video game competition and aggression. In add...

Agonistic aggression has provided an excellent framework to study how conserved circuits and neurochemical mediators control species-specific and context-dependent behavior. The principal inhibitory control upon aggression is serotonin (5-HT) dependent, and the activation of 5-HT(1A) receptors is involved in its action. To address whether the serotonergic system differentially regulates differe...

This study compared the contribution of genes and environment to teacher-rated reactive and proactive aggression in 6-year-old twin pairs (172 pairs: 55 monozygotic girls, 48 monozygotic boys, 33 dizygotic girls, 36 dizygotic boys). Genetic effects accounted for 39% of the variance of reactive aggression and for 41% of the variance of proactive aggression. The remainder of the variance was expl...

Territorial aggression is influenced by many social and environmental factors. Since aggression is a costly behavior, individuals should account for multiple factors such as population density or reproductive status before engaging in aggression. Previous work has shown that male California mice (Peromyscus californicus) respond to winning aggressive encounters by initiating aggression more qui...

OBJECTIVE The study was designed to determine the prevalence of aggression and clinical factors associated with aggression among psychiatric in-patients at Jos University Teaching Hospital. This will help create a good knowledge base about management of these patients. MATERIALS AND METHODS All admitted psychiatric patients between December, 2005, and February, 2007, that met the ICD-10 crite...

BACKGROUND The term "aggression" refers to forceful behavior, action, or attitude that is expressed physically, verbally, or symbolically. Aggression in the medical environment can have different forms. The interactions between psychiatrists and patients may be one of the reasons for the appearance of symptoms of aggression in the behaviour of the physicians. The main aim of the study was to ev...

People often displace their aggression against innocent targets. Notwithstanding the merits of previous research on displaced aggression, critical gaps remain. First, it is unclear whether and how situational and dispositional factors interact to influence displaced aggression. Moreover, it is unclear whether engaging in direct aggression increases or decreases displaced aggression. To address ...