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Reduced P300 responses in criminal psychopaths during a visual oddball task
K A Kiehl1, R D Hare, P F Liddle
1Department of Psychology, University of British Columbia, Vancouver, Canada.
Biological Psychiatry
|June 5, 1999
Summary
Psychopaths exhibit distinct neural processing differences in simple cognitive tasks compared to nonpsychopaths, particularly in event-related potential (ERP) responses like the P300 wave.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Forensic Psychology
Background:
- Clinicians have long observed cognitive deficits in psychopaths.
- Experimental studies on these deficits are limited.
- This study investigates the neural correlates of psychopathy using event-related potentials (ERPs).
Purpose of the Study:
- To characterize the neural underpinnings of cognitive processing in psychopaths.
- To compare ERPs between psychopathic and nonpsychopathic individuals during a visual oddball task.
- To explore information processing models of psychopathy.
Main Methods:
- Recorded ERPs from 11 psychopathic and 10 nonpsychopathic prison inmates.
- Utilized the Hare Psychopathy Checklist-Revised for assessment.
- Administered a visual oddball task with target and nontarget stimuli.
Main Results:
- No group differences in ERPs for nontarget stimuli.
- Nonpsychopaths showed a larger P300 amplitude to target stimuli than nontarget stimuli.
- Psychopaths exhibited reduced P300 amplitude differences between target and nontarget stimuli, with smaller P300 to targets and less lateralization.
- Psychopaths displayed a larger centrofrontal negative wave (N550) during the target condition.
Conclusions:
- Significant differences exist in simple cognitive task processing between psychopaths and nonpsychopaths.
- Findings support information processing models of psychopathy.
- ERPs reveal distinct neural patterns associated with psychopathy.