What are the core features of psychopathy? A prototypicality analysis using the Psychopathy Checklist-Revised (PCL-R)

What are the core features of psychopathy? Previous prototypicality analyses showed that many features were considered as highly prototypical. We extend this work by using forced ranking to grasp which features are most important. Forensic mental health professionals ranked the 20 Psychopathy Checklist-Revised (PCL-R) items on their importance to psychopathy. Affective-interpersonal features were judged to be of greater importance than behavioral-lifestyle features. The most important items were callous/lack of empathy, conning/manipulative, and lack of remorse or guilt, which were deemed more important than nearly all other PCL-R features. The prototypicality ranking of the 20 PCL-R items by the forensic mental health professionals showed strong overlap (r = .64 to .86) with psychometric indices of item importance (network centrality, item-total correlation, and IRT discrimination parameter). Taken together, our findings clarify the relative importance of PCL-R features to psychopathy.