Raine et al. (1997)
- Created by: Natwallace
- Created on: 15-04-18 11:47
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- Raine et al. (1997)
- Aim
- The brains of murderers who pleaded insanity were different to non-murderers
- Hypotheses
- Dysfunction would be present in:
- The prefrontal cortex
- Angular gyrus
- Amygdala
- Hippocampus
- Thalamus
- There would be no dysfunction in:
- Caudate
- Putamen
- Globus pallidus
- Midbrain
- Cerebellum
- Dysfunction would be present in:
- Use PET scanning to check for dysfunction
- Background
- Started from the idea that brain damage/ dysfunction may lead to violent behavior
- Procedure
- Pps given glucose tracer
- Performed Continuous Performance Task (CPT)
- PET scan carried out after 32 minutes
- Performed Continuous Performance Task (CPT)
- Controls
- Pps allowed to practice CPT 10 before tracer injected
- None of the pps were on medication 2 weeks prior to theexperiment
- Pps given glucose tracer
- Sample
- 82 people
- 41 murders who pleaded NGRI
- 39 males, 2 females
- 3 had a history of psychoactive drug abuse
- 2 had affective disorders
- 23 had head injuries or organic brain damage
- 2 had epilepsy
- 3 had a history of hyperactivity and learning disability
- 6 had schizophrenia
- 2 had personality disorders
- Kept of medication 2 weeks before
- 41 control pps
- Matched in gender and age
- 6 had schizophrenia to match the 6 in the murderer group
- Not on medication
- 41 murders who pleaded NGRI
- 82 people
- Results
- The NGRI's showed less activity in the frontal lobe especially the prefrontal lobe
- Also less activity in the parietal lobe but more in the occipital lobe
- Also less activity in the Corpus callosum ( the nerve bridge)
- An in balance of activity in the limbic system
- Less activity on the left than on the right in the amygdala
- Conclusions
- NGRI's have lower glucose metabolism in the:
- Prefrontal cortex
- Corpus callosum
- Parietal cortex
- Abnormal activity between the different hemispheres of the:
- Medial temporal gyrus
- Hippocaqmpus
- Thalamus
- Amygdala
- NGRI's have lower glucose metabolism in the:
- Aim
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