VALIDATION OF THE SIMULATION INDEX-REVISED WITH A MIXED CLINICAL POPULATION

The Simulation Index-Revised (SI-R) was previously developed to differ entiate impaired motivation from traumatic brain injury sequelae in pa tients referred for neuropsychological assessment. Rather than using q uantitative comparisons of performance, the SI-R evaluates qualitative errors on the WAIS-R and WMS. The present study examined the specific ity of the SI-R in a clinical sample of 338 patients of mixed diagnose s. The overall level of specificity was 62% in this sample. patient gr oups with diagnoses of schizophrenia, vascular dementia, and alcohol d ependence had lower specificity than did the mean of the entire sample . The need for additional studies and SI-R item analyses are discussed .