biological exp for aggression

biological exp for aggression

1. genetics

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     • only relationship with height determined!- theilgard 84'
   • MAOA
     • (brunner) etal -dutch fmily men with defecteive gene for production of it and low level of maoa- men all agressive
       • gender bias - suggests men only afftectected by this
     • monoamine oxidase a
     • gene regulates emzymme maoa which breaks down seretonin +dopamine (assosiated with mood)
     • caspi- two varients- high and low levels
       • low levels - more chance of aggression- but only if maltreated as child- suggests hat gene and environment interact that determines agression not gene alone
         • nature and nurture
         • whloistic explanation- better fr treatment and application to reduce agression
         • longitudinal study- childhood maltreatment and later criminal offending
           • not all of them could have been convicted or cought?
           • long term afects of genetics in behavur
           • longitudinal- attritin rates? - not representitive data? so not as valid and then this lacks support!
           • 12% who had maoa- 44% of violent convitions and 85% of the 12% had forme anti social behaviour
   • ANIMAL EVIDENCE
   • twin studies
     • hard to find twins with agressive genes and be twins- saple may not be representative- may mean this exp isnt widley spread so may not be cause or multi-causal?
     • mednick et al
       • nature/nurtue
       • free will?
       • criminality ^ 5% if both sets of parents were aggressive
       • criminal offense same as aggression?

2. neurotransmitters

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3. hrmones

   • testosterne
     • castration of rat decreased aggrssion and input of testosterone ^ it
     • middle ranking mokey- ^ in test ore agressive but only t whom below him and stayed middle ranking
     • frustraion causes

4. brain damage

   • finnias gage
   • amagdala- feelings