Aggression
Some scholars believe that behaviors like aggression may be partially learned by watching and imitating people's behavior, while other researchers have concluded that the media may have some small effects on aggression. There is also research questioning this view. For instance, a long-term outcome study of youth found no long-term relationship between playing violent video games and youth violence or bullying. One study suggested there is a smaller effect of violent video games on aggression than has been found with television violence on aggression. This effect is positively associated with type of game violence and negatively associated to time spent playing the games. The author concluded that insufficient evidence exists to link video game violence with aggression. However, another study suggested links to aggressive behavior.
Abuse
In their review of data from the Dunedin Multidisciplinary Health and Development Study (a longitudinal birth cohort study; n = 941) Moffitt et al. report that while men exhibit more aggression overall, gender is not a reliable predictor of interpersonal aggression, including psychological aggression. The study found that whether male or female, aggressive people share a cluster of traits, including high rates of suspicion and jealousy; sudden and drastic mood swings; poor self-control; and higher than average rates of approval of violence and aggression (in American society, females are, on average, excused when violent against males). Moffitt et al. also argue that antisocial men exhibit two distinct types of interpersonal aggression (one against strangers, the other against intimate female partners), while antisocial women are rarely aggressive against anyone other than intimate male partners.