There is evidence that brain damage leads to a change in behaviour for example, from law-abiding to a criminal. Thus it can explain criminality in that damage sustained by certain areas of the brain e.g. pre-frontal cortex, can affect the impulsiveness and fearlessness etc of an individual, driving them to crime.
- Main study - Raine:
- Looked at patterns of brain activity in murderers compared to non-murderers using PET scans.
- 41 p's charged with murder, pleaded NGRI but convicted, 39 M 2 F. Control group matched for age and sex. 6 p's had schizo - controls also matched.
- P's injected with a glucose tracer following a practice task, they then did a continous performance task. PET scans were taken immediately after 10 horizontal images and 10 mm intervals. Scans used to indicate brain activity in different areas.
- Findings: Sig. differences in activity levels between murderers and control. Reduced activity on left side of brain and in pre-frontal cortex + corpus callosum (implicated w/ aggression). Reduced activation in hippocampus, thalamus and amygdala.
The areas with abnormal activity are associated with lack of fear, low self-control, increased aggression and impulsiveness. All linked with committing acts of extreme violence.
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