This study supports previous findings that have shown links between areas of the brain and aggression. This provides evidence that murderers pleading NGRI have different brrain functioning to normal individuals.
Confounding variables: Large sample and matched controls. However, head injury and IQ have not been ruled out as contributory factors.
Warning: These results don't show that-
1. Violent behaviour is only determined by biology. Social, cultural etc factors have an impact
2. Murderers pleading NGRI are not responsible for their actions nor thst PET scans can diagnose violent individuals.
3. Violence can be explained by the results, the results only relate to criminal behaviour.
4. Brain dysfunction causes violence, may be an effect of violence
Findings DO suggest link between brain dysfunction and predisposition towards violence in this NGRI group.
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