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Examination of the MMPI-2 restructured form (MMPI-2-RF) validity scales in civil forensic settings: findings from
Dustin B Wygant1, Yossef S Ben-Porath, Paul A Arbisi
1Department of Psychology, Eastern Kentucky University, Richmond, KY 40475, USA. dustin.wygant@eku.edu
Abstract:
The current study examined the effectiveness of the MMPI-2 Restructured Form (MMPI-2-RF; Ben-Porath and Tellegen, 2008) over-reporting indicators in civil forensic settings. The MMPI-2-RF includes three revised MMPI-2 over-reporting validity scales and a new scale to detect over-reported somatic complaints. Participants dissimulated medical and neuropsychological complaints in two simulation samples, and a known-groups sample used symptom validity tests as a response bias criterion. Results indicated large effect sizes for the MMPI-2-RF validity scales, including a Cohen's d of .90 for Fs in a head injury simulation sample, 2.31 for FBS-r, 2.01 for F-r, and 1.97 for Fs in a medical simulation sample, and 1.45 for FBS-r and 1.30 for F-r in identifying poor effort on SVTs. Classification results indicated good sensitivity and specificity for the scales across the samples. This study indicates that the MMPI-2-RF over-reporting validity scales are effective at detecting symptom over-reporting in civil forensic settings.
Insights
The Minnesota Multiphasic Personality Inventory-2 Restructured Form (MMPI-2-RF) effectively identifies individuals over-reporting symptoms in forensic evaluations. Its validity scales demonstrate strong performance in detecting exaggerated complaints in civil legal settings.
Area of Science:
- Forensic Psychology
- Psychological Assessment
- Clinical Psychology
Background:
- The Minnesota Multiphasic Personality Inventory-2 Restructured Form (MMPI-2-RF) is a widely used psychological assessment tool.
- Over-reporting of symptoms is a concern in civil forensic evaluations, potentially impacting case outcomes.
- Existing validity scales require evaluation for their efficacy in detecting exaggerated complaints in forensic contexts.
Purpose of the Study:
- To examine the effectiveness of the MMPI-2-RF over-reporting indicators in civil forensic settings.
- To assess the performance of the MMPI-2-RF's revised validity scales and new somatic complaint scale in detecting dissimulation.
- To determine the sensitivity and specificity of these scales in identifying poor effort.
Main Methods:
- The study utilized two simulation samples where participants feigned medical and neuropsychological complaints.
- A known-groups sample was employed, using symptom validity tests (SVTs) as a criterion for response bias.
- Effect sizes (Cohen's d) and classification accuracy (sensitivity, specificity) were calculated for MMPI-2-RF validity scales.
Main Results:
- The MMPI-2-RF validity scales demonstrated large effect sizes in detecting simulated over-reporting across various samples.
- Specific scales like Fs, FBS-r, and F-r showed significant effectiveness, with Cohen's d values ranging from .90 to 2.31.
- Classification analyses confirmed good sensitivity and specificity for the scales in identifying poor effort and symptom over-reporting.
Conclusions:
- The MMPI-2-RF over-reporting validity scales are effective tools for detecting symptom exaggeration in civil forensic evaluations.
- These scales provide reliable indicators of response bias, aiding in the accurate assessment of individuals in legal contexts.
- The findings support the utility of the MMPI-2-RF in forensic settings where symptom validity is crucial.
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