REM sleep and EEG abnormalities in criminal psychopaths

Area of Science:

• Neuroscience
• Psychiatry
• Sleep Medicine

Background:

• Psychopathy is associated with EEG slowing, suggesting cortical underarousal or immaturity.
• Rapid Eye Movement (REM) sleep plays a role in cortical development and maintenance.
• Hare's theory proposed a REM deficit in psychopaths to explain observed cortical abnormalities.

Purpose of the Study:

• To investigate the validity of Hare's REM deficit theory in psychopathy.
• To compare sleep patterns, specifically REM sleep, among different groups of incarcerated criminals.

Main Methods:

• Three groups of male incarcerated criminals were studied: psychopaths with normal EEGs, psychopaths with abnormal EEGs, and nonpsychopaths with normal EEGs.
• Sleep stages were monitored over multiple nights using polysomnography.
• Statistical analysis, including stepwise multiple discriminant analysis, was used to compare sleep patterns.

Main Results:

• No significant differences in overall sleep patterns were found between the groups.
• Contrary to Hare's theory, psychopaths with abnormal EEGs exhibited the highest REM sleep duration and percentage.
• Findings suggest a potential overabundance, rather than a deficit, of REM sleep in some psychopaths.

Conclusions:

• The study does not support Hare's REM deficit theory of psychopathy.
• Observed EEG abnormalities in psychopaths may not be linked to reduced REM sleep.
• Further research is needed to understand the complex relationship between psychopathy, EEG activity, and sleep architecture.