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Genes and environment interact in first graders to predict physical but not social aggression

Research with 400 pairs of 7-year-old twins assessed the genetic and environmental effects on children's physical and social aggression (behaviors such as spreading rumors). Specifically, the researchers found that physical aggression in a friend is likely to interact with genetic tendency towards physical aggression; however, a child's social aggression was not affected by one's genetic disposition. Further, effects of friends' aggression on other children's aggression were only observed within the same type of aggression.

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Keywords: genes, environment, interact, graders, predict, physical, social, aggression, gene, grader

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