Reduced P300 responses in criminal psychopaths during a visual oddball task

Background: Clinicians have long recognized that psychopaths show deficits in cognitive function, but there have been few experimental studies explori ng these deficits. We present here the first in a series of event-related p otential (ERP) experiments designed to elucidate and characterize the neura l correlates of cognitive processes of psychopaths. Methods: We recorded ERPs from a topographic array from II psychopathic and 10 nonpsychopathic prison inmates, assessed with the Hare Psychopathy Chec klist-Revised, during performance of a visual oddball task ERPs to target ( 25% of trials) and nontarget (75% of trials) visual stimuli were analyzed. Results: Consistent with previous research, there were no group differences in the latency or amplitude of the ERPs for the nontarget stimuli. For non psychopaths, the P300 amplitude was larger when elicited by the target stim uli than when elicited by the nontarget stimuli. In contrast psychopaths fa iled to show reliable P300 amplitude differences between the target and non target conditions. Psychopaths had a smaller amplitude P300 to target stimu li than did nonpsychopaths. In addition, the amplitude of the P300 was less lateralized in psychopaths than in nonpsychopaths. Psychopaths also had a larger centro-frontal negative wave (N550) during the target condition than did nonpsychopaths. Conclusions: The results of this study indicate that there are substantial differences between psychopaths and others in the processing of even simple cognitive tasks and provide support for information processing models of p sychopathy. (C) 1999 Society of Biological Psychiatry.