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Abnormalities of predictive saccades in Parkinson's disease.

O'Sullivan, E. P. and Shaunak, S. S. and Hawken, M. and Crawford, T. J. (1997) Abnormalities of predictive saccades in Parkinson's disease. Neuroreport, 8 (5). pp. 1209-1213.

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Abstract

SACCADES of patients with mild Parkinson's disease (PD) are said to be abnormal in the absence of a concurrently visible target or when they are part of a rapid sequence of eye movements. We tested this hypothesis using a predictive saccade paradigm in which target visibility is withdrawn for a period. Three rates of target alternation were used (0.25 Hz, 0.5 Hz and 1.0 Hz). Withdrawal of target visibility brought out the extremes of primary saccade gain for both the controls and the patients with PD, most undershoot being displayed at the lowest frequency, whereas the gain was greatest at the highest frequency, actually overshooting the target location. These results demonstrate that the spatial error of parkinsonian saccades does not invariably take the form of hypometria when part of a rapid sequence of eye movements.

Item Type: Article
Journal or Publication Title: Neuroreport
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Departments: Faculty of Science and Technology > Psychology
ID Code: 18966
Deposited By: ep_ss_importer
Deposited On: 07 Nov 2008 10:10
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:24
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/18966

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