Genetic factors
- Created by: Maudie
- Created on: 13-02-18 12:56
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- Genetic Factors
- Twin studies
- Expect to find more similarities in aggressive behaviour if agg. is genetically influenced
- Coccaro et al. studied MZ + DZ twins
- Direct physical assault - concordance rates 50% MZ, 19%DZ
- Large difference - must be genetics
- Verbal aggression - 28% MZ, 7% DZ
- Large difference - must be genetics
- Direct physical assault - concordance rates 50% MZ, 19%DZ
- Adoption studies
- genetic if +ve correlation between agg. in adopted children + bio parents.
- Hutchings + Mednick - 14,000 Denmark adoptions.
- Significant no. of adopted boys w/criminal convictions had bio parents w/convictions
- MAOA-L gene
- Regulates serotonin metabolism in brain. Low S = agg.
- freq. in pops w/history of warfare
- Brunner et al. - 28 males in a large Dutch family involved in agg. behaviour - had v. low levels of MAOA in brain - MAOA-L present
- Regulates serotonin metabolism in brain. Low S = agg.
- Other important genes - Stuart et al. found agg. in males associated with MAOA-L and 5-HTT (serotonin transport gene)
- Separate genes/environment - in twin studies MZ could be treated more similarly than DZ - cannot know role. Adoption studies - good as they are separated, but adoption itself could be traumatic.
- Diathesis-stress model. Frazetto et al. found association between MAOA-L and antisocial aggression only when ppts had trauma in first 15yrs of life. Agg is INTERACTIONIST
- Debate: determinism. Agg gene applied to treatment of criminals + legal issues? Takes responsibility away from criminals eg. Bradley Warldrup
- Twin studies
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