Abstract

Objective: Assess the concordance between Psycho-Assistant (PA) and the Structured Inventory of Malingered Symptomatology (SIMS) for the assessment of symptom exaggeration. Method: A total of 31 post-MVA compensation-seeking consecutive referrals were evaluated, which was 44% male with an average age of 39.6 years (SD = 15.3) and 13.8 years of education (SD = 2.2). Linear regression models with backwards elimination to minimize suppressor effects were used to compare various PA and SIMS variables. Results: A model predicting SIMS total score (R = .65; F(3, 27) = 6.62, p = 0.002) was associated with slower PA performance times and lower scores on its third subtest (retesting with distorted images accompanied by random feedback) and accounted for 36% of adjusted variance. Another model predicting the number of PA subtest cutoffs failed (0–3) was also highly significant (R = .62; F = 5.63, p = 0.004) with the final model including SIMS subtests predictors Neuro-Impairment (p = .004), Low Intelligence (p = .04) and Affective Disorders (p = .07). Conclusion(s): Most self-report measures have low concordance with cognitive symptom validity tests (SVTs). These results suggest some utility for the self-reported SIMS relative to PA. However it is noteworthy that SIMS scales for Psychosis and Amnestic Disorder were unrelated to PA performance. Given the excellent cross-validation of PA with TOMM, CARB and the WMT, these results support utility of the SIMS as a screen for CSV concerns.