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Auditory event related potentials in violent and nonviolent prisoners
M E Drake1, A Pakalnis, M E Brown
1Ohio State University Hospitals, Department of Neurology, Ohio State University College of Medicine, Columbus 43210.
European Archives of Psychiatry and Neurological Sciences
|January 1, 1988
Summary
Neurophysiologic studies reveal prolonged P3 latency in habitually violent inmates, suggesting potential brain differences. However, differences in auditory event-related potentials (AEPs) between violent and non-violent individuals were not consistently significant.
Area of Science:
- Neuroscience
- Psychology
- Criminology
Background:
- The neurophysiologic basis of aggression and violence is a complex area of study.
- Electroencephalography (EEG) findings in violent individuals are often nonspecific.
- Evoked potentials, particularly long-latency auditory event-related potentials (AEPs), have been underutilized in behavioral disorder research.
Purpose of the Study:
- To investigate differences in long-latency auditory event-related potentials (AEPs) between habitually violent inmates, inmates who committed violent acts, non-violent prisoners, and controls.
- To explore potential neurophysiological markers associated with violent behavior.
Main Methods:
- Auditory event-related potentials (AEPs) were recorded using an 'oddball' paradigm from vertex and temporal electrodes.
- Participants included habitually violent inmates, inmates jailed for non-violent offenses, and neurologically and audiologically intact controls.
- Analysis focused on AEP component latencies and amplitudes, including N1, P2, and P3, and examined hemispheric asymmetries.
Main Results:
- No significant differences in AEP latencies were found exceeding 3 standard deviations beyond the normal group mean.
- N1 and P2 components showed trends towards longer latency and lower amplitude in prisoners compared to controls, but not statistically significant.
- P3 latency was significantly prolonged in habitually violent inmates, but not in those who committed a violent act during another crime. A right-sided latency asymmetry was observed in violent prisoners, absent in non-violent groups.
Conclusions:
- Prolonged P3 latency may be a potential neurophysiological correlate of habitual violence, but not necessarily of violence committed during other offenses.
- Observed right-sided temporal AEP asymmetry in violent prisoners warrants further investigation.
- Caution is advised when interpreting neurophysiological differences between criminal populations and the general population, and when seeking specific markers for violent behavior.