Raine, Buchsbaum and Lacasse (1997) experiment

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Explain the methodology of Raine et al...
-The research method was a Quasi experiment.
- Had a matched pairs design.
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What was the independent and dependent variables in this experiment?
DV- Brain difference
IV: NGRI.
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What was their sample like?
-41 offenders (39 men and 2 woman)
-They had been charged with manslaughter and pleaded not guilty for reasons of insanity or incompetence to stand trial.
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explain the table...
.
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What were the offenders instructed to do?
Stay medication free for two weeks before prior
to brain scanning.
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What were the control group scanned for?
Health with a physical exam and psychiatrics interview.
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Explain the procedures...
-A PET scan was used which involved giving all pps a tracer as an 'injection' FDG
-the injection to 32 mins to be taken up by the brain and the pps completed a continuous performance CPT task.
-32 mins a PET scan was done where 10 slides of the brain wer
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Explain what happened before the injection FDG?
-10 minutes before the injection the pps were given a practice trials on CPT.
- 30 seconds before the injection the CPT began o the initial task novelty wasn't affected by FDG.
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What is the Cortical peel?
Where surface cortical regions were measured.
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What is the Box Method?
Where medial and subcortical regions were measured.
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What did Raine et al find in the findings for Reduced Activity?
Found reduced activity in the brain of NGRI pps in areas previously linked to violence:
- prefrontal cortex
-parietal lobe
-corpus callosum
-Left hemisphere- amygdala ,thalamus and hippocampus.
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What did Raine et al find in increased activity in the brain of NGRI pps in areas not
previously linked to violence?
There was increased activity in:
-cerebellum
-occipital lobe
-right hemisphere (amygdala, thalamus and hippocampus)
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What did Raine et al find with the no difference between NGRI ad control group in areas not previously linked to violence?
They found no difference in the:
-Caudate
-Putamen
-Globus Palidus
-Midbrain
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What were the conclusions that Raine et al came up with?
-Murderers pleading NGRI have different brain functioning to normal individuals. They had statistically significant differences in glucose metabolism compared to normal individuals.
- The type of brain dysfunction may predispose an individual to violent b
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What did Raine et all conclude that the results do not do?
-Their results do not show that violent behavior is caused by biology alone.
-They also do show that murderers pleading NGRI are responsible for their actions
-Does not confirm if PET scans can be used to diagnose violent behavior's.
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What were the similarities with the groups?
-Both groups of PPs performed similarly on the CPT therefore brain differences were not related to task performance.
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What were some differences between the 2 groups?
- Handiness- 6 murderess were left handed and had less abnormal amygdala asymmetry and higher prefrontal activity than right handed murderers.
Ethnicity - 14 murderers were non white but there was no difference in brain activity between them & white murde
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Card 2

Front

What was the independent and dependent variables in this experiment?

Back

DV- Brain difference
IV: NGRI.

Card 3

Front

What was their sample like?

Back

Preview of the front of card 3

Card 4

Front

explain the table...

Back

Preview of the front of card 4

Card 5

Front

What were the offenders instructed to do?

Back

Preview of the front of card 5
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