Do MMPI-3 Validity Scale Findings Generalize to Concurrently Administered Measures? Validation with a Forensic...

Area of Science:

• Psychological Assessment
• Clinical Psychology
• Forensic Psychology

Background:

• Previous research indicates that validity scales on the MMPI-2/-RF can detect response biases that generalize to other self-report measures.
• Ensuring response validity is critical in psychological evaluations, particularly in forensic and disability contexts.

Purpose of the Study:

• To investigate whether the Minnesota Multiphasic Personality Inventory-3 (MMPI-3) Validity Scales demonstrate generalizability of detected over-reporting and under-reporting to other measures.
• To examine the extent to which MMPI-3 Validity Scales predict response validity on extra-test self-report, performance-based, and performance validity tests.

Main Methods:

• A sample of 665 male disability claimants completed the MMPI-3, various self-report measures with embedded symptom validity tests (SVTs), performance-based measures, and performance validity tests (PVTs).
• Participants were categorized into three groups based on MMPI-3 Validity Scale scores: over-reporting (n=276), under-reporting (n=100), and within normal limits (WNL; n=289).

Main Results:

• MMPI-3 detected over-reporting generalized to symptom over-reporting on other psychopathology measures and was associated with poorer performance on cognitive and performance validity tests.
• MMPI-3 detected under-reporting generalized to symptom minimization on collateral psychopathology measures.
• No significant differences in cognitive functioning were found between under-reporters and the WNL group, with minor exceptions.

Conclusions:

• The MMPI-3 Validity Scales are effective in identifying potential over- and under-reporting on concurrently administered measures.
• These findings highlight the utility of MMPI-3 Validity Scales in contexts where other assessment tools may lack robust validity indicators.