Brendgen et al (2005): Contemporary study - Results, conclusion Flashcards
What were the findings of the experiment?
- Physical aggression has genetic influences
- Social aggression has environmental influences
What was the conclusion about when children grow?
They tend to become more socially aggressive because of social conventions on violence + developing diff ways to express themselves
What was the conclusion about children who were physically aggressive?
They’re also more likely to display social aggression, probs becayse of interaction between genes + environment
What was a strength of this experiment?
Small subsample of same sex twin pairs (123) were evaluated using DNA sample against 8-10 genetic markers
To check accuracy of zygosity allocation
What was a weakness of this experiment?
Determined zygosity (MZ or DZ) based on physical resemblance using Zygosity Questionaire for Young Twins
Low in validity, even siblings can look similar, inaccurate data
How was consent gained?
There was active written consent from parents of all kids in classroom
What was an issue with peer rating?
Was highly time consuming + expensive
What % of twins received at least 1 nomination for being most socially + physically aggressive in the class?
82%
What was the gender difference between aggression in results?
Girls were more socially aggressive + boys were more physically aggressive
Why is it difficult to assess environmental influence on children’s behaviour?
Only 1 child tested per family - Don’t know if due to parenting or genetics
What are the 2 models that may explain link between physical + social aggression?
- Correlated etiological factors model
- Phenotype-to-phenotype model
What are 2 environmental factors that may influence both physical + social aggression?
- Negative parenting behaviours
- Affiliation with similarly aggressive friends
