Biological Aggression

Neural
1. dopamine
  1. increase maybe=aggression
  2. may be rewarding
    1. so seek out aggressive encounters
      1. produces dopamine
  3. difficult to establish link
  4. dopamine antagonists reduce dopamine
    1. reduce aggressive behaviour
  5. turn off dopamine in mice
2. seratonin
  1. decrease=aggression
  2. dexfenfluramine depletes
  3. seratonin metabolism
    1. not levels
    2. increaced receptors
      1. more violent suicide
  4. low amounts of waste product in aggressive people
3. rat fight every day for 10 days
  1. Ferrari et al
Hormonal
1. tesosterone
  1. dominance link
  2. makes aggression more likely
    1. inconsistant evidence
  3. challenge hypothesis
    1. testosterone rises in social situations
  4. +in older people
    1. 208 men
    2. enhance vigor and energy
  5. gender bias
  6. Book et al
    1. meta analysis
  7. no sd between violent and non violent offenders
2. cortisol
  1. lower levels=highter levels of aggression
    1. violent offenders
  2. may inhibit aggression
  3. inconsistant evidence
Genetic
1. MAOA
  1. warrior gene
  2. breaks down serotonin and dopamine
    1. Brunner
      1. men with defect gene
        family history of aggression
        tested urine
        lots of neurotransmitter
        not much MAOA waste
        environmental factors?
2. twin+adoption studys
  1. feelings of abandonment
  2. + offender treatment
3. 40%
4. difficult to seporate nature and nurture
  1. MZ twins
  2. gene and environment interaction
5. 87% MZ
  1. treated as one
6. 72% DZ
7. measure antisocial behaviour
  1. not aggression
8. self report

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Biological Aggression

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