Aggression genetic explanations Flashcards
What did Mason and Frick find in 1994? What makes it special?
Genes account for about 50% of aggressive tendencies. It was a meta-analysis of twin and adoption studies.
What did Hutchings and Medinck find? Give details of the study.
High concordance between conviction for children and their biological fathers. 14,000 twins in this twin study.
What theory suggests twin studies are unreliable for testing concordance of MZ and DZ twins?
Equal environments theory.
What did Brunner find?
Studying a family whose males were highly aggressive, he found that they were suffering from a defective MAOA gene. As a result they had high levels of dopamine, noradrenaline and serotonin.
What did Caspi find in 2002?
A defective MAOA gene only led to a significant increase in aggressive if paired with severe maltreatment at childhood.
Genes account for about 50% of aggressive tendencies. It was a meta-analysis of twin and adoption studies.
Mason and Frick, 1994.
High concordance between conviction for children and their biological fathers. 14,000 twins in this twin study.
Hutchings and Medinck.
Studying a family whose males were highly aggressive, he found that they were suffering from a defective MAOA gene. As a result they had high levels of dopamine and testosterone and low levels of serotonin.
Brunner.
A defective MAOA gene only led to a significant increase in aggressive if paired with severe maltreatment at childhood.
Caspi, 2002.
