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Assessment
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Development and Validation of a Response Bias Scale (RBS) for the MMPI-2

Roger O. Gervais

Neurobehavioural Associates, rgervais{at}shaw.ca

Yossef S. Ben-Porath

Kent State University

Dustin B. Wygant

Kent State University

Paul Green

Neurobehavioural Associates

This study describes the development of a Minnesota Multiphasic Personality Inventory (MMPI-2) scale designed to detect negative response bias in forensic neuropsychological or disability assessment settings. The Response Bias Scale (RBS) consists of 28 MMPI-2 items that discriminated between persons who passed or failed the Word Memory Test (WMT), Computerized Assessment of Response Bias (CARB), and/or Test of Memory Malingering (TOMM) in a sample of 1,212 nonhead-injury disability claimants. Incremental validity of the RBS was evaluated by comparing its ability to detect poor performance on four separate symptom validity tests with that of the F and FP scales and the Fake Bad Scale (FBS). The RBS consistently outperformed F, FP, and FBS. Study results suggest that the RBS may be a useful addition to existing MMPI-2 validity scales and indices in detecting symptom complaints predominantly associated with cognitive response bias and overreporting in forensic neuropsychological and disability assessment settings.

Key Words: MMPI-2 • response bias • symptom validity • malingering • faking • forensic evaluation

Assessment, Vol. 14, No. 2, 196-208 (2007)
DOI: 10.1177/1073191106295861
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