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Comparison of Performance of the VIP and WMT in a Criminal Forensic Sample.

Objective: To compare the efficacy of the Validity Indicator Profile (VIP) and Word Memory Test (WMT) in a criminal forensic population.

Method: Potential participants included 225 male evaluees from a maximum-security Federal prison referred for neuropsychological evaluation for either forensic purposes or for suspected neurocognitive dysfunction as part of a medical evaluation. Examinees were included in the analysis if administered the VIP (Verbal, Nonverbal, or both tests) and WMT along with at least two other freestanding PVTs; 74 satisfied these criteria. Participants were then categorized as having probable Malingered Neurocognitive Dysfunction (+MND) if they failed at least two freestanding validity indicators, negative for MND (-MND) if they passed all indicators, and Possible MND (pMND) if they failed one indicator.

Results: Groups were very demographically similar. There were significant differences in WMT scores and distribution of VIP profiles across groups. Whether using traditional or investigative cut scores, and whether using the WMT with or without consideration of a GMIP profile, the WMT demonstrated superior sensitivity and specificity on nearly every comparison.

Conclusions: The VIP, when interpreted in the traditional fashion, and the WMT with GMIP, both had more than adequate psychometric properties when used with criminal forensic evaluees, strengthening the body of literature supporting their use for these types of evaluations. Counting a positive on either of the VIP subtests as an indication of +MND improves the psychometric properties of the VIP slightly, although the WMT had the better overall classification accuracy.

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