Clinical decision making in response to performance validity test failure in a psychiatric setting

Area of Science:

• Neuropsychology
• Forensic Psychology
• Clinical Psychology

Background:

• Performance validity tests (PVTs) are crucial in neuropsychological assessments to detect response bias.
• Distinguishing genuine cognitive impairment from malingering is essential for accurate diagnosis and treatment planning, especially in forensic and civil commitment settings.

Purpose of the Study:

• To evaluate the clinical utility of a PVT, specifically the Test of Memory Malingering (TOMM), in screening patients referred to a state psychiatric hospital's neuropsychology service.
• To examine the relationship between PVT failure, secondary gain, and patient characteristics (demographic, clinical, forensic).

Main Methods:

• A cohort of 436 consecutive referrals to a neuropsychology service were screened using the TOMM.
• A contingency table analyzed TOMM pass/fail rates against the presence or absence of secondary gain (defined by active criminal legal charges).
• Base rates of neurocognitive malingering were estimated using the Test Validation Summary (TVS) based on TOMM False Positive and True Positive Rates.

Main Results:

• PVT failure was more common in patients with secondary gain (31%) than without (11%).
• Of those failing the PVT without secondary gain, characteristics included older age, female gender, Caucasian ethnicity, and civil commitment status.
• Clinical ratings for patients failing the PVT without secondary gain suggested cognitive deficits, behavioral issues, and inattention.

Conclusions:

• PVT failure, even in the absence of obvious secondary gain, provides valuable information about patient engagement during testing.
• Findings suggest that PVT results can inform clinical decisions regarding the interpretation of neuropsychological test data and guide further evaluation.
• The study highlights the importance of considering PVT results in diverse clinical and forensic populations to ensure the validity of neuropsychological assessments.