Sensitivity across all validity indicators was low in this research sample, though cutoff scores were congruent with previous research. Conclusions: Digit Span ACSS was the strongest predictor of noncredible performance, and outperformed traditional RDS variants. Vocabulary minus Digit Span measures were not significant. Overall, cutoff scores were consistent with other studies, but sensitivities were lower. Of RDS measures, the Working Memory RDS resulted in the highest AUC (.629), but Enhanced RDS and Alternate RDS produced the highest sensitivities (0.22). Results: Digit Span age-corrected scaled score (ACSS) had the highest AUC (.648) of all measures assessed however, sensitivity at the best cutoff of <7 was only 0.17. Diagnostic accuracy was calculated predicting group status across cutoff scores on two Digit Span variables, four Reliable Digit Span (RDS) variables, and two Vocabulary minus Digit Span variables. Of the total sample ( N = 275), 21.09% failed the MSVT and/or b Test. The Noncredible group included individuals who failed either the MSVT or the b Test. Method: Neurologically-intact veterans completed structured diagnostic interviews, the WAIS-IV, the Medical Symptom Validity Test (MSVT), and the b Test as part of a larger study.
This study evaluated Wechsler Adult Intelligence Scale, 4th edition (WAIS-IV) Digit Span validity indicators in post-deployment veterans. Objective: Embedded validity measures are useful in neuropsychological evaluations but should be updated with new test versions and validated across various samples.
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