Children's understanding of the human mind has been found to be related to many social and experiential factors such as interactions with peers (Astington & Jenkins, 1995), parental socioeconomic a...

As Archer argues, recent developmental data on human physical aggression support the sexual selection hypothesis. However, sex differences are largely due to males on a chronic trajectory of aggression. Maternal characteristics of these males suggest that, in societies with low levels of physical violence, females with a history of behavior problems largely contribute to maintenance of physical aggression sex differences.