Key research by Raine

Quasi experiment (Iv- murderers or non murderers) is naturally occuring . DV= activity in regions of the brain PET scans Sample - 41 matched on age and sex . so matched pair design mean age 34.3 control group - no mental illnesses Results - murderers had reduced glucose metabolism in the prefrontextal cortex , left angular gyrus,corpus callosum and reduced activity in the amygdala, hippocampus and thalamus. Conclusion - Raine did not conclude that there were only biological causes for violence just that there might be a predisposition to violence in some people depending on environment triggers