Examining genetic and environmental effects on reactive versus proactive aggression.

  title={Examining genetic and environmental effects on reactive versus proactive aggression.},
  author={Mara Brendgen and F. Vitaro and Michel Boivin and Ginette Dionne and Daniel Perusse},
  journal={Developmental psychology},
  volume={42 6},
This study compared the contribution of genes and environment to teacher-rated reactive and proactive aggression in 6-year-old twin pairs (172 pairs: 55 monozygotic girls, 48 monozygotic boys, 33 dizygotic girls, 36 dizygotic boys). Genetic effects accounted for 39% of the variance of reactive aggression and for 41% of the variance of proactive aggression. The remainder of the variance was explained by unique environmental effects. Genetic as well as unique environmental effects were… CONTINUE READING

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