Raine, Buchsbaum and LaCasse- 1997

Created by: Georgia123321
Created on: 10-04-19 18:11

Hypothesis

Participants pleading 'not guilty by reasons of insanity' (NGRI) would show brain dysfunctions in areas of the brain associated with violence.

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Experimental Group

41 convicted criminals (murder/manslaughter) 6 had schizophrenia, 23 had suffered organic brain damage/head injury. 3 substance abusers, 2 had affective disorders, 2 had epilepsy, 3 hyperactivity and/or LD, 2 passive aggressive /paranoid personality

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Control Group

matched with exp group on age and gender, all screened for health. Consent was gained form all P’s before PET scan was administered.

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Procedure

Each P were given a ‘continuous performance task’ (CPT). Started this as a practice for 10 mins before being injected with flouorodeoxyglucose (FDG). After 32 mins a PET scan was completed to measure metabolic rate in different areas of the brain.

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Findings

The Performance of the CPT had no effect. Brain differences- reduced activity in the brain, In somme areas previously linked to violence. No differences- mental illness but no violence. Abnormal asymmetries- reduced activity on left side of brain,

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Other Findings

6 Murderers were left handed- higher medical prefrontal activity. 23 had head injury. Between black and white people- there were no differences.

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Conclusion

Left- Less Active. Right- More reactive. Reduced activity in some areas, notably the areas linked with violence.

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Experimental Group

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Control Group

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Procedure

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Findings

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Raine, Buchsbaum and LaCasse- 1997