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Clin Neuropsychol. 2013;27(1):138-47. doi: 10.1080/13854046.2012.722686. Epub 2012 Oct 12.

Symptom validity testing in medically unexplained pain: a chronic regional pain syndrome type 1 case series.

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Psychological Systems, Inc., Royal Oak, MI, USA.


This study examines validity findings in a particular behavioral pain disorder. We examined two types of validity scores in 73 participants with a primary diagnosis of the controversial Complex Regional Pain Syndrome Type I (CRPS-1). All participants were incentivized by a disability-seeking context. Failure rates on performance validity tests ranged from 23% (Test of Memory Malingering) to 50% (Reliable Digit Span). Positive findings on symptom validity tests (MMPI-2 or MMPI-2-RF) ranged from 15% to 50% of subsamples. At least 75% of the sample failed one performance validity indicator and over half showed at least one positive symptom validity score. This initial study suggests that CRPS-1 could serve as a good patient model for studying the role of simulation in pain-related disability.

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