Verbal fluency findings in PDD are inconsistent. In general, patients with PDD are comparably impaired to patients with AD on lexical and semantic verbal fluency tasks (81) and, in some cases, verbal fluency deficits may be even more severe in PDD (28). Demented PD patients may perform especially poorly on a task that requires the examinee to rapidly generate as many verbs (i.e., "things that people do") as possible (82). Impairment in visual confrontation naming, most often measured by the Boston Naming Test, is less pronounced in PDD than in AD, if present at all (83).

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