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Left-hemisphere activation and deficient response modulation in psychopaths.

A Bernstein1, J P Newman, J F Wallace

  • 1Department of Psychology, 1202 West Johnson St., University of Wisconsin, Madison, WI 53706, USA.

Psychological Science
|March 7, 2001
PubMed
Summary

Psychopathic offenders struggle with response modulation, especially when left-hemisphere functions are engaged. This study found their memory deficits for secondary task details were specific to left-hemisphere processing.

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Area of Science:

  • Neuroscience
  • Psychology
  • Criminology

Background:

  • Psychopathic offenders exhibit deficits in processing secondary cues during goal-directed behavior.
  • Previous research suggests these deficits may be linked to specific hemispheric resource engagement.

Purpose of the Study:

  • To investigate whether response modulation deficits in psychopaths are specific to left-hemisphere engagement.
  • To examine the role of hemispheric lateralization in the cognitive impairments associated with psychopathy.

Main Methods:

  • A serial recall task was administered to 21 incarcerated psychopaths and 21 control subjects.
  • Participants memorized word-location pairs presented visually.
  • Recall of both word order and location was assessed.

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Main Results:

  • Psychopaths and controls showed similar performance in recalling words from left and right visual fields.
  • Psychopaths recalled significantly fewer word locations from the right visual field compared to controls.
  • This indicates a specific deficit in response modulation when left-hemisphere resources are engaged.

Conclusions:

  • The findings support the hypothesis that psychopathic response modulation deficits are specific to conditions engaging left-hemisphere resources.
  • This suggests lateralized cognitive processing differences contribute to psychopathic behavior.
  • Understanding these hemispheric specificities may inform targeted interventions for psychopathic offenders.