Factor structure and construct validity of the psychopathic personality inventory in a forensic sample

Area of Science:

• Forensic Psychology
• Clinical Psychology
• Personality Assessment

Background:

• The Psychopathy Checklist-Revised (PCL-R) is widely used but criticized for administration difficulties and incomplete measurement of psychopathy.
• Alternative measures are needed to capture the core personality features of psychopathy more effectively.

Purpose of the Study:

• To evaluate the Psychopathy Personality Inventory (PPI) and its revised version (PPI-R) as measures of psychopathy.
• To compare the PPI and PPI-R with the PCL-R and their ability to predict recidivism and related constructs.

Main Methods:

• Study 1: Examined the PPI's factor structure and its correlation with the PCL-R.
• Study 2: Assessed the PPI-R's relationship with the PCL-R, PPI, empathy, criminal thinking, and history of violence, and its predictive validity for future violent behavior.

Main Results:

• The PCL-R and PPI showed minimal correlations; neither reliably predicted recidivism.
• The PPI-R correlated significantly with measures of empathy and criminal thinking.
• The PPI-R's factors were associated with a history of violence and predicted future violent criminal behavior.

Conclusions:

• The PPI-R appears to be a more effective measure of psychopathy's core personality features than the PCL-R.
• The PPI-R demonstrates utility in assessing factors related to violence and predicting future violent criminal behavior.