Psychopathy Checklist-Revised

"In order to detect its neurobiological substrates, we examined 39 male psychopathic subjects and matched controls using structural magnetic resonance imaging and the Psychopathy Check-List (PCL-R)." The PCL-R combines interview results with professional assessments and official records to produce three scores: an overall score, a factor 1 score that measures interpersonal and emotional traits, and a factor 2 score that measures impulsive and antisocial behavior . Future studies may also consider other possible reasons for these differences in brain structure – which could include drug abuse, for example, or traumatic experiences – to help identify cause and effect more clearly.