Symptom validity vesting (SVT), also known as forced-choice testing, is a means of assessing the validity of sensory and memory deficits, including tactile anesthesias, paresthesias, blindness, color blindness, tunnel vision, blurry vision and deafness.1,3,4,5  The common feature among all these symptoms is a claimed inability to perceive or remember a sensory signal. The adaptability of SVT to perceptual or memory complaints is limited only by the examiner—s imagination. SVT is not adaptable to evaluating claims of internal sensory signals (for example, pain).

Symptom validity testing comprises two elements: (1) a specific ability is assessed by presenting a large number of items in a multiple-choice format, and (2) the examinee—s performance is compared to the statistical likelihood of success based on chance alone, (ie, no ability). These tests usually have two multiple-choice...

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