title: Examining genetic and environmental effects on social aggression: a study of 6-year-old twins.
abstract: Using a genetic design of 234 six-year-old twins, this study examined (a) the contribution of genes and environment to social versus physical aggression, and (b) whether the correlation between social and physical aggression can be explained by similar genetic or environmental factors or by a directional link between the phenotypes. For social aggression, substantial (shared and unique) environmental effects but only weak genetic effects were found. For physical aggression, significant effects of genes and unique environment were found. Bivariate modeling suggests that social and physical aggression share most of their underlying genes but only very few overlapping environmental factors. The correlation between the two phenotypes can also be explained by a directional effect from physical to social aggression.
authors: Department of Psychology, Université du Québec à Montréal, Canada. Brendgen.Mara@uqam.ca
authors: Mara
authors: M
authors: Brendgen
authors: Ginette
authors: G
authors: Dionne
authors: Alain
authors: A
authors: Girard
authors: Michel
authors: M
authors: Boivin
authors: Frank
authors: F
authors: Vitaro
authors: Daniel
authors: D
authors: Pérusse
mesh_terms: D000374:Aggression / Q000523:psychology*; D002648:Child; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics / Q000523:psychology; D005838:Genotype; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D010379:Peer Group; D010552:Personality Assessment; D010641:Phenotype; D011792:Quebec; D012737:Sex Factors; D012931:Social Environment; D013223:Statistics as Topic; D014427:Twins / Q000235:genetics* / Q000523:psychology