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Comprehensive Analysis of MMPI-2-RF Symptom Validity Scales and Performance Validity Test Relationships in a Diverse Mixed Neuropsychiatric Setting.
Psychological Injury and Law 2022 November 4
The utility of symptom (SVT) and performance (PVT) validity tests has been independently established in neuropsychological evaluations, yet research on the relationship between these two types of validity indices is limited to circumscribed populations and measures. This study examined the relationship between SVTs on the Minnesota Multiphasic Personality Inventory-2-Restructured Form (MMPI-2-RF) and PVTs in a mixed neuropsychiatric setting. This cross-sectional study included data from 181 diagnostically and demographically diverse patients with neuropsychiatric conditions referred for outpatient clinical neuropsychological evaluation at an academic medical center. All patients were administered a uniform neuropsychological battery, including the MMPI-2-RF and five PVTs (i.e., Dot Counting Test; Medical Symptom Validity Test; Reliable Digit Span; Test of Memory Malingering-Trial 1; Word Choice Test). Nonsignificant associations emerged between SVT and PVT performance. Although the Response Bias Scale was most predictive of PVT performance, MMPI-2-RF SVTs generally had low classification accuracy for predicting PVT performance. Neuropsychological test performance was related to MMPI-2-RF SVT status only when overreporting elevations were at extreme scores. The current study further supports that SVTs and PVTs measure unique and dissociable constructs among diverse patients with neuropsychiatric conditions, consistent with literature from other clinical contexts. Therefore, objective evidence of symptom overreporting on MMPI-2-RF SVTs cannot be interpreted as definitively indicating invalid performance on tests of neurocognitive abilities. As such, clinicians should include both SVTs and PVTs as part of a comprehensive neuropsychological evaluation as they provide unique information regarding performance and symptom validity.
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