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Assessment, Vol. 13, No. 4, 470-482 (2006)
DOI: 10.1177/1073191106289861
© 2006 SAGE Publications

The Interpersonal Measure of Psychopathy

Construct and Incremental Validity in Male Prisoners

Stacey Zolondek

Assessment and Treatment Alternatives, Philadelphia

Scott O. Lilienfeld

Emory University, slilien{at}emory.edu

Christopher J. Patrick

University of Minnesota

Katherine A. Fowler

Emory University

The authors examined the construct and incremental validity of the Interpersonal Measure of Psychopathy (IM-P), a relatively new instrument designed to detect interpersonal behaviors associated with psychopathy. Observers of videotaped Psychopathy Checklist-Revised (PCL-R) interviews rated male prisoners (N = 93) on the IM-P. The IM-P correlated significantly with the PCL-R total score. Moreover, the IM-P was preferentially related to the interpersonal rather than the affective and antisocial lifestyle features of psychopathy. IM-P scores were significantly correlated with age, antisocial behaviors, and self-reported fear, anxiety, and socialization (in reverse). Hierarchical multiple regression analyses demonstrated that although the IM-P exhibited incremental validity beyond the PCL-R total score in detecting self-reported fear, anxiety, and several personality traits, it did not exhibit much incremental validity beyond PCL-R Factor 1. These findings raise questions concerning the unique assessment contribution of the IM-P beyond PCL-R Factor 1. Potential reasons for these findings and alternative means of enhancing the interpersonal assessment of psychopathy are discussed.

Key Words: psychopathy • interpersonal • assessment • personality • antisocial behavior


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