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Genes and Environment Interact in First Graders to Predict Physical but Not Social Aggression |
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From EurekAlert! - Breaking News: Physical aggression in children comes from their genes and the environment in which they grow up. Social aggression, such as spreading rumors or ignoring other children, has less to do with genetic factors and more with environmental factors. One important environmental influence on children is friends. But while past studies have shown an association between physically aggressive friends and increased physical aggression in children and teens, few studies have looked at how socially aggressive friends affect children's social aggression, nor have they considered possible gene-environment transactions in these behaviors. A new study by researchers at the University of Quebec at Montreal, Laval University, Concordia University, and the University of Montreal sought to determine whether the interaction between nature and nurture, that is, between children's genetic disposition to aggression and friends' aggression (social or physical), could help explain differences in children's own aggression. The study appears in the January/February 2008 issue of Child Development. The researchers assessed approximately 400 pairs of 7-year-old twins, each of whom was asked to list up to three friends in their classroom. Specifically, the genetic disposition to physical aggression is more likely to express itself when children are exposed to physically aggressive friends. No gene-environment interaction was found with respect to children's social aggression. The research was funded in part by the Social Sciences and Humanities Research Council of Canada, the Canadian Institutes of Health Research, the Fonds Quebecois de la Recherche sur la Societe et la Culture, and the Fonds de Recherche en Sante du Quebec.
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