brendegen
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what was bredgens aim
to investigate if social agression could be caused by genes or environment
what was Brendan sample
234 6 yr old twin pairs
how many where monozygotic
94 pairs
how many where dizygotic
67 pairs
when where all the pairs born
1995-1998c
what design was it
longitudinal
what was the procedure
the teacher filled in two questionnaires on the twins- asking questions on social aggression ‘ tries to make a child dislike another child’or physical aggression on a three point scalechildren given pictures of thier class mates and circle children who best fit description
what where brendegens findings
their was a much higher correlation between the ratings of mz twin pairs on physical agression compared to same sex dizygotic twin pairs peers more likely to find boys more physically agressive and girls more socialy agressive
what did brendegen conclude
there is a strong genetic component to physical agression but not social agression