Cognitive performance and Parkinson disease: neuropsychological and CT study.

30 patients with Parkinson disease were investigated with computed tomographic (CT) scanning and neuropsychological tests. The CT data proved to be of scant interest whereas tests of intelligence, verbal and visual memory and visuomotor abilities were all informative. Parkinsonian patients with cognitive impairment seem to constitute a separate group in which akinesia and gait disturbances predominate.