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Abstract:
This study examined the ability to detect malingering on the Wechsler Adult Intelligence Scale - Third Edition (WAIS-III) in mild traumatic brain injury (MTBI) litigants. Given the increase in litigation cases for lost cognitive abilities following MTBI, coupled with the fact that very few chronic deficits persist, it has become standard practice for neuropsychologists to administer malingering measures. Investigators recommend that standard cognitive tasks be employed to capture poor test performance, in addition to, free-standing malingering measures, in order to circumvent attorney coaching. If examinees pass malingering measures via being coached by their attorney, and perform poorly on neuropsychological testing, they may be awarded unjustifiable financial settlements. This poses a large problem for insurance fraud in the United States, which was estimated to cost $85.3 billion in 1995. Therefore, this study proposed to examine malingering markers on a standardized measure (i.e., the WAIS-III) in a sample of MTBI litigants. Participants were MTBI litigants referred from attorneys and physicians as part of civil litigation. All data were archival. Evaluations consisted of a WAIS-III and two+ standardized malingering measures. Participants were assigned to one of three groups based on malingering measure scores: (a) absence of malingering; (b) probable malingering; or (c) definite malingering. Results were expected to show the malingering group to produce the lowest IQ scores, memory-related WAIS-III measures, and that the malingering group would produce higher scatter within subtests. One-way ANOVAs demonstrated that the malingering group produced significantly lower scores on Verbal IQ, Performance IQ, and Full Scale IQ, as well as the overt memory subtests of Digit Span, Letter-Number Sequencing, Reliable Digit Span, and the Working Memory Index. The malingering group demonstrated significantly higher intrasubtest scatter on the Vocabulary, Similarities, Digit Span, Digit Span backward, and Comprehension subtests. The malingering group produced significantly lower percentage correct scores on all WAIS-III subtests. The malingering group tended to perform in the low average - borderline range across all tasks, when in fact; MTBI examinees typically do not demonstrate deficits on the WAIS-III. Further research should be conducted to confirm or deny these findings. Overall, this study provides encouraging results for capturing malingering within a standard measure administered during a neuropsychological evaluation.
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