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Gepubliceerd in: Journal of Psychopathology and Behavioral Assessment 3/2011

01-09-2011

Effectiveness of the MMPI-2-RF Validity Scales for Feigned Mental Disorders and Cognitive Impairment: A Known-Groups Study

Auteurs: Richard Rogers, Nathan D. Gillard, David T. R. Berry, Robert P. Granacher Jr.

Gepubliceerd in: Journal of Psychopathology and Behavioral Assessment | Uitgave 3/2011

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Abstract

The MMPI and MMPI-2 validity scales have long been accepted as standard tools in the assessment of feigned mental disorders (FMD) based on their extensive empirical validation. Studies are now examining MMPI-2-RF with modified validity scales plus the new Infrequent Somatic Responses Scale (FS) and the recently-adapted Response Bias Scale (RBS). The current investigation used a known-groups design to examine the effectiveness of the MMPI-2-RF for differentiating FMD and feigned cognitive impairment (FCI) from patients with genuine disorders for a large civil forensic sample. Criterion measures included the Structured Interview of Reported Symptoms-2 (SIRS-2) for the FMD group, and below-chance performances on the Victoria Symptom Validity Test (VSVT) and the Test of Memory Malingering (TOMM) for the FCI group. For FMD, both F-r and FP-r produced very large effect sizes (ds > 2.00). Moreover, the absence of severe elevations (≥80 T) on F-r proved effective at ruling-out most FMD. For the current study, a FP-r cut score ≥90 T for FMD produced virtually no false-positives (0.01) and only a moderate level of false-alarms. As predicted by its detection strategies, most MMPI-2-RF validity scales have limited effectiveness with the FCI group. However, FBS-r and RBS may be useful in conjunction with other clinical data for ruling out FCI for genuine neuropsychological consults. An entirely separate concern is whether certain diagnostic groups, such as major depression, will have marked elevations on MMPI-2-RF scales thereby increasing the likelihood of false-positives. On this point, FP-r performed exceptionally well with unelevated scores (Ms < 55 T) consistently across diagnostic categories.
Voetnoten
1
Of interest to current research, Jackson (1970, p. 64) noted that “response styles often will determine major portions of the variance.” Therefore, his model proposes that test items be systematically screened for social desirability before their inclusion; this key step was omitted from the MMPI-2-RF.
 
2
Following Rogers and Bender (2003), we use feigned or feigning (i.e., gross exaggeration or fabrication of psychological symptoms or cognitive deficits) rather than over-reporting or malingering. Over-reporting lacks precision and could be applied to minor embellishments, whereas malingering requires the individualized determination of motivation.
 
3
We follow the recommendation of Rogers (2008a) for the classification of effect sizes: moderate (≥.75), large (≥1.25), and very large (≥1.50).
 
4
Wygant et al. (2009, p. 7) cited Larrabee (2008) indicating that two or more failures on cognitive-feigning measures “provides a much higher likelihood of malingering” than relying on any single indicator.
 
5
We adopted the following convention for describing MMPI-2-RF elevations: moderate (65–79 T), severe (80–89 T), extreme (90–99 T), very extreme (≥100 T).
 
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Metagegevens
Titel
Effectiveness of the MMPI-2-RF Validity Scales for Feigned Mental Disorders and Cognitive Impairment: A Known-Groups Study
Auteurs
Richard Rogers
Nathan D. Gillard
David T. R. Berry
Robert P. Granacher Jr.
Publicatiedatum
01-09-2011
Uitgeverij
Springer US
Gepubliceerd in
Journal of Psychopathology and Behavioral Assessment / Uitgave 3/2011
Print ISSN: 0882-2689
Elektronisch ISSN: 1573-3505
DOI
https://doi.org/10.1007/s10862-011-9222-0

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