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Detection of Feigned Mental Disorders

A Meta-Analysis of the MMPI-2 and Malingering

University of North Texas

Kenneth W. Sewell

University of North Texas

Mary A. Martin

University of North Texas

Michael J. Vitacco

University of Massachusetts

The validity of test data from multiscale inventories is dependent on self-reports that may be easily distorted by malingering. In examining the Minnesota Multiphasic Personality Inventory-2's (MMPI-2) role in the assessment of feigning, this review provides a conceptual analysis of the detection strategies underlying the MMPI-2 validity scales. The conceptual analysis is augmented by comprehensive meta-analysis of 65 MMPI-2 feigning studies plus 11 MMPI-2 diagnostic studies. For the rare-symptoms strategy, Fp (Cohen's d = 2.02) appears especially effective across diagnostic groups; its cut scores evidence greater consistency than most validity indicators. The data supported the F as an effective scale but questioned the routine use of Fb. Among the specialized scales, Ds appeared especially useful because of its sophisticated strategy, consistent cut score, and minimal false-positives. General guidelines are offered for specific MMPI-2 validity scales in the assessment of malingering with specific diagnoses.

Key Words: malingering • MMPI-2 • overreporting • feigning • detection strategies

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