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Brendgen et Al (2005) - Coggle Diagram
Brendgen et Al (2005)
AO1
Aim
To find out if there is a physical difference between physical and social aggression in 6 year old school children by surveying their teachers and classmates.
Procedure
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peers
Were shown photos of their class mates and asked to circle photos of 3 children that fir 4 description:
- Tells others not to play with a child
- Tells mean secrets about another child
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- Hits, bites or kicks others
Findings
The differences between MZ and DZ twins were not significant. Teacher and peer ratings had a correlation (more valid). Teachers rated boys more aggressive than girls physically and girls more socially aggressive. Peers rated boys more aggressive socially and physically.
Conclusion
Brendgen concluded that about 50-60% of physical aggression can be linked to genes since it was shared by MZ twins but not DZ twins. For social aggression genes only seemed to account for about 20%.
Sample
234 pairs of twins taken from Quebec new-born twin study. Longitudinal study that was already going on. 44 sets of identical (MZ) male twins, 50 sets of identical (MZ) females 41 non-identical (DZ) males, 32 nonidentical (DZ) females and 67 sets of non-identical (DZ) mixed gender twins.
AO3
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Validity
Nature v nurture. Correlation does not prove causation. Extraneous variables could affect MZ twins. Study is natural meaning it has ecological validity
Reliability
Used established questionnaires to measure aggression. Can easily be replicated making study reliable.
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