• J Clin Exp Neuropsychol · Oct 2006

    Comparative Study

    Pain, malingering, and performance on the WAIS-III Processing Speed Index.

    • Joseph L Etherton, Kevin J Bianchini, Matthew T Heinly, and Kevin W Greve.
    • Loyola University, New Orleans, USA.
    • J Clin Exp Neuropsychol. 2006 Oct 1; 28 (7): 1218-37.

    AbstractPain patients often report cognitive symptoms and many will include them in their claims of disability. The Processing Speed Index (PSI) of the WAIS-III was investigated as one aspect of cognitive functioning in six groups. Slight impairment was found for PSI and Digit Symbol subtest performance, but not for Symbol Search, in a Laboratory-induced Pain group and a Clinical Pain group. The lowest scores were found in a Simulator group instructed to fake cognitive impairment and a Clinical Pain group diagnosed as Malingering. Results suggest that PSI scores are only slightly reduced by laboratory-induced pain or chronic pain, and that unexpectedly low scores in the absence of significant/documented brain dysfunction suggest poor effort or deliberate misrepresentation.

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