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Criminal Psychology

Raine et al. (1997) brain abnormalities in murderers: background, procedure and brain findings

  • 3 things to know
  • Component 03

Overview

Recall questions on the aim of Raine et al.'s 1997 brain imaging study of murderers, the experimental and control groups, medication screening, PET scanning and the continuous performance task, the quasi-experimental design, and reduced glucose metabolism and asymmetries in the murderers.

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Study

Why were participants kept free of medication for two weeks and given a urine screen before the scan?

Key term

Describe the experimental group in Raine et al.'s study.

Key term

How was the control group formed?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What was the aim of Raine et al.'s brain imaging study of murderers?

    Model answer

    To test whether people who had killed and pleaded not guilty by reason of insanity showed different patterns of brain glucose metabolism from matched non-offenders, particularly in areas already linked to violence.

  2. 2

    Describe the experimental group in Raine et al.'s study.

    Model answer

    Forty-one people charged with murder or manslaughter, thirty-nine men and two women with a mean age of about 34, all of whom had pleaded not guilty by reason of insanity and had been referred for imaging to support their defence.

  3. 3

    How was the control group formed?

    Model answer

    Forty-one people were matched to the murderers for age and sex and screened to be free of physical and mental illness, except that the six murderers with schizophrenia were matched with people who also had schizophrenia.

  4. 4

    Why were participants kept free of medication for two weeks and given a urine screen before the scan?

    Model answer

    Because drugs alter brain glucose metabolism, so any medication still in the body would have confounded the measure of brain activity.

  5. 5

    Which scanning technique was used, and what did the tracer actually measure?

    Model answer

    Positron emission tomography was used, and the radioactive glucose tracer was taken up in proportion to how much glucose each area was using, giving a measure of that area's activity.

  6. 6

    What task did participants perform while the tracer was taken up, and why was that task chosen?

    Model answer

    They performed a continuous performance task detecting degraded targets for around thirty-two minutes, because it is known to activate the frontal lobes and so would reveal any frontal differences.

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