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Saccadic Eye Movements in Parkinson's Disease: II. Remembered Saccades— Towards a Unified Hypothesis?

Lueck, C. J. and Crawford, Trevor and Henderson, L. and Van Gisbergen, J. A. M. and Duysens, J. and Kennard, C. (1992) Saccadic Eye Movements in Parkinson's Disease: II. Remembered Saccades— Towards a Unified Hypothesis? The Quarterly Journal of Experimental Psychology Section A : Human Experimental Psychology, 45 (2). pp. 211-233. ISSN 0272-4987

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Abstract

Ten patients with mild to moderate Parkinson’s disease were compared with ten age-matched normal controls in a series of saccadic paradigms in order to test various hypotheses relating to the origin of the Parkinsonian saccadic defect. The paradigms comprised a reflex saccade paradigm, a standard remembered saccade paradigm, a remembered saccade paradigm with delayed centre-offset, and a remembered saccade paradigm with a second target flash immediately prior to saccade execution. Finally, subjects executed both reflex and remembered saccades in a standard remembered paradigm (the “twosaccade” paradigm). As has been reported previously, Parkinsonian subjects demonstrated hypometria on all remembered saccade paradigms, particularly the “two-saccade” paradigm. There was, however, no significant difference between the first three remembered saccade paradigms. These studies serve to refute a simple attentional capture hypothesis, and a hypothesis that suggests that the abnormality of remembered saccades is due to concurrent reflex saccade suppression. On the basis of the results, further hypotheses are advanced in an attempt to explain all published work on Parkinsonian saccades.

Item Type: Article
Journal or Publication Title: The Quarterly Journal of Experimental Psychology Section A : Human Experimental Psychology
Uncontrolled Keywords: Parkinson's disease ; Eye tracking
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Departments: Faculty of Science and Technology > Psychology
ID Code: 58202
Deposited By: ep_importer_pure
Deposited On: 16 Oct 2012 14:47
Refereed?: Yes
Published?: Published
Last Modified: 28 Oct 2013 11:26
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58202

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