contemporary study - Brendgen et al

Question 1

what is the aim

Answer 1

extent social and physical aggession can be explained by genetic and environmental factors

Question 2

what was the method

Answer 2

longitudinal study
montreal canada
2% drop out rate
234 twin pairs, MZ male and female, DZ male female and mixed
consent from parents
final data collection after 6 years
teachers rated social and physical aggression
peers given photo book, had to circle 3 students that best fit 4 behavioural descriptions

Question 3

what were the results

Answer 3

physical teacher
MZ .61 DZ .25
social pree
MZ .50 DZ.40

Question 4

what were the conclusions

Answer 4

contribution of genetic factors on individual differences for physical
social may be explained more by non-shared environmental factors than genetics

Question 5

evaluate

Answer 5

+ peer and teacher ratings over 9 months adds validity and reliability
- small sample size
+ translations of french to english checked by bilingual reasearchers, validity
+ holistic, environmental and genetic factors
- correlation study, no cause and effect