Abstract
The underlying latent structure of the Wisconsin Card Sorting Test (WCST) was examined in sets of nonpatient normals and neurologically impaired individuals. Making use of the WCST standardization sample, a factor-analytic procedure was employed to evaluate the instrument's structure. The findings revealed that in normal individuals, the WCST is best described by a unitary factor. In contrast, in neurological patients with either focal or diffuse impairment, performance on this test is primarily explained on the basis of two factors: Problem Solving/Perseveration and Loss of Set. The inclusion of nonperseverative errors on this second factor was more obvious in neurological patients with focal lesions.
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