Screening for Psychopathy: Validation of the Psychopathic Personality Inventory-Short Form with Reference Scores

Journal of Psychopathology and Behavioral Assessment (Impact Factor: 1.55). 12/2012; 35(2). DOI: 10.1007/s10862-012-9333-2


The current study reports validation results for the Psychopathic Personality Inventory (PPI) and its subscales, and for a newly developed PPI-Short Form (PPI-SF) in forensic and non-forensic populations. We also provide criterion reference scores for the PPI and the PPI-SF. In Study 1, we used PPI data from 1,065 participants and supplementary PCL-R data from a subsample of 91 forensic offenders. Mokken scale analysis was used to construct the PPI-SF. In Study 2, PPI-SF and PCL-R data were collected from 60 participants. The study yielded promising but preliminary support for the construct validity of the PPI and the PPI-SF. The PPI-SF is of interest for risk assessment because of its (a) strong relationship with the PCL-R total score and (b) subscales known for their predictive value for violence and criminal recidivism.

Download full-text


Available from: Franca Tonnaer, Sep 13, 2014
357 Reads
  • Source
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Some self-report measures of personality and personality disorders, including the widely used Psychopathic Personality Inventory-Revised (PPI-R), are lengthy and time-intensive. In recent work, we introduced an automated genetic algorithm (GA)-based method for abbreviating psychometric measures. In Study 1, we used this approach to generate a short (40-item) version of the PPI-R using 3 large-N German student samples (total N = 1,590). The abbreviated measure displayed high convergent correlations with the original PPI-R, and outperformed an alternative measure constructed using a conventional approach. Study 2 tested the convergent and discriminant validity of this short version in a fourth student sample (N = 206) using sensation-seeking and sensitivity to reward and punishment scales, again demonstrating similar convergent and discriminant validity for the PPI-R-40 compared with the full version. In a fifth community sample of North American participants acquired using Amazon Mechanical Turk, the PPI-R-40 showed similarly high convergent correlations, demonstrating stability across language, culture, and data-collection method. Taken together, these studies suggest that the GA approach is a viable method for abbreviating measures of psychopathy, and perhaps personality measures in general. (PsycINFO Database Record (c) 2014 APA, all rights reserved).
    Psychological Assessment 12/2014; 27(1). DOI:10.1037/pas0000032 · 2.99 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Psychopathic individuals display a callous-coldhearted approach to interpersonal and affective situations and engage in impulsive and antisocial behaviors. Despite early conceptualizations suggesting that psychopathy is related to enhanced cognitive functioning, research examining executive functioning (EF) in psychopathy has yielded few such findings. It is possible that some psychopathic trait dimensions are more related to EF than others. Research using a 2-factor or 4-facet model of psychopathy highlights some dimension-specific differences in EF, but this research is limited in scope. Another complicating factor in teasing apart the EF-psychopathy relationship is the tendency to use different psychopathy assessments for incarcerated versus community samples. In this study, an EF battery and multiple measures of psychopathic dimensions were administered to a sample of male prisoners (N = 377). Results indicate that using the Psychopathy Checklist-Revised (PCL-R), the independent effect of Factor 2 was related to worse EF, but neither the independent effect of Factor 1 nor the unique variance of the Factors (1 or 2) were related to EF. Using a 4-facet model, the independent effects of Facet2 (Affect) and Facet4 (Antisocial) were related to worse EF, but when examining the unique effects, only Facet2 remained significant. Finally, the questionnaire-based measure, Multidimensional Personality Questionnaire-Brief, of Fearless Dominance was related to better EF performance, whereas PCL-R Factor 1 was unrelated to EF. Overall, the results reveal the complex relationship among EF and behaviors characteristic of psychopathy-related dimensions. Moreover, they demonstrate the interpersonal and affective traits measured by these distinct assessments are differentially related to EF. (PsycINFO Database Record (c) 2015 APA, all rights reserved).
    Personality Disorders: Theory, Research, and Treatment 05/2015; DOI:10.1037/per0000125 · 3.54 Impact Factor