PMID: 9533393Apr 9, 1998Paper

Impairments of mental rotation in Parkinson's disease

Neuropsychologia
A C LeeJ E Calvert

Abstract

It is controversial whether parkinsonian patients are impaired on visuospatial tasks. In the present study, patients and normal control subjects judged whether pairs of wire-frame figures in different orientations were the same or different. The orientation difference between the figures was either in the picture plane (around the z-axis, or two-dimensional) or in depth (around the y-axis, or three-dimensional). Reaction times and error rates were measured. For the two-dimensional task, there were no significant differences in errors between the two groups, though Parkinsonian subjects were significantly slower to respond than the control group. In the three-dimensional task, patients had a different pattern of reaction times from the controls and made significantly more errors, which were systematic at large angular differences. The results suggest a visuospatial deficit in Parkinson's disease, which reflects problems in some aspect of the perception of extra-personal space.

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