Studies Into Biological Explanations of Aggression

Created by: Natalie
Created on: 12-05-13 20:26

Genetics - Christiansen (1977) Twin Study

Concordance analysis of over 3000 twins in Denmark found that over 900 twins were registered for criminal activity. Male MZ twins: 35% concordance, DZ twins: 12% concordance. Female MZ: 21% concordance, DZ: 8% concordance.

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Genetics - Mednick et al (1984) Adoption Study

Concordance analysis of Danish adoptees found 13.5% of adoptees (parents without a CC) had a conviction themselves, 14.7% (at least one CC adoptive parent) and 20% (at least one CC biological parent)

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Hormones - Van Goozen et al (1994) Sex-Change

Repeated measures design, 35 male-to-female and 15 male-to-female used questionnaires before & after to assess proneness to aggression. Female-to-male transsexuals reported an increase in aggression due to levels of testosterone.

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Christiansen (1977)

Twin study

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Mednick et al (1984)

Adoption study

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Van Goozen et al (1994)

Sex-change study

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Concordance analysis of Danish adoptees found 13.5% of adoptees (parents without a CC) had a conviction themselves, 14.7% (at least one CC adoptive parent) and 20% (at least one CC biological parent)

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Genetics - Mednick et al (1984) Adoption Study

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Card 4

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Twin study

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Card 5

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Adoption study

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Studies Into Biological Explanations of Aggression