Findings and conclusions

• Reduced activity

  In brains of NGR participants in areas previously linked to violence

  • Prefrontal cortex
  • Parietal Lobe
  • Corpus callosum
  • Left hemisphere-amygdala, thalamus and hippocampus
• increase activity

  • Cerebellum
  • Right hemisphere- amygdala, thalamus, Hippocampus
  • occipital lobe
• No difference

  • caudete
  • putamen
  • midbrain
  • temporal lobe
• both groups performed similarly on the CPT therefore brain differences not related to task
• left-handed


  Six murders left-handed and had less abnormal amygdala asymmetry and higher pre-activity
• ethnicity

  14 murderer were not white there was no difference
• conclusions

  provides preliminary evidence that Marrer has played an NTRI have different brain function to normal individuals. This may predispose individual to violent behaviour rather than causing it. Violence is complex and cannot be reduced to singular brain mechanism.