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Progressive supranuclear palsy

The relationship between ocular motor dysfunction and psychological test performance

Departments of Psychology and Clinical Neurological Sciences, the University of Western Ontario, London, Ontario, Canada.

The performance of patients with progressive supranuclear palsy on visual search and scanning tasks was related to the pattern of ocular motor deficits observed in these patients during horizontal refixation. Comparisons were made to age-matched normals and patients with Parkinson disease or cerebellar damage. The poor performance of the progressive supranuclear palsy group on visual search and scanning could not be attributed to the restricted range of vertical gaze or the large number of hypometric saccades during horizontal reification. Instead, we believe that their impaired scanning resulted from the presence of square-wave jerks during attempted fixation.

Address correspondence and reprint requests to Dr. Goodale, Department of Psychology, University of Western Ontario, London, Ontario, N6A 5C2 Canada.

This study was supported in part by Grant No. MA-7269 from the Medical Research Council of Canada to M. A. Goodale.

Accepted for publication December 10, 1981.

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