Abnormal gaze strategies during problem solving in Parkinson's disease

Hodgson, T. L. and Tiesman, B. and Owen, A. M. and Kennard, C. (2002) Abnormal gaze strategies during problem solving in Parkinson's disease. Neuropsychologia, 40 (4). pp. 411-422. ISSN 0028-3932

Full content URL: http://dx.doi.org/10.1016/S0028-3932(01)00099-9

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Item Type:Article
Item Status:Live Archive

Abstract

We have taken a novel approach to the study of problem solving involving the detailed analysis of natural scanning eye movements during the 'one touch' Tower of London task. Control subjects and patients with idiopathic Parkinson's disease (PDs) viewed a series of pictures depicting two arrangements of coloured balls in pockets within the upper and lower halves of a computer display. The task was to plan (but not execute) the shortest movement sequence required to rearrange the balls in one half of the display (the Workspace) to match the arrangement in the opposite half (the Goalspace) and indicate the number of moves required for problem solution. As problem complexity increased, control subjects spent proportionally more time fixating the Workspace region. This pattern was found regardless of whether subjects were instructed to solve problems by rearranging balls in the lower or upper visual fields. The distribution of gaze within the Workspace was also found to be problem dependent, with gaze being selectively directed towards the problem critical balls. In contrast, PDs were found to make more errors in the task and failed to show any dissociation in the amount of time fixating the two halves of the display. This pattern suggests that the patients had difficulty in encoding and/or maintaining current goals during problem solving, consistent with a role for fronto-striatal circuits in mechanisms of working memory and attention. © 2001 Elsevier Science Ltd. All rights reserved.

Keywords:adult, aged, analytical error, article, controlled study, eye fixation, eye tracking, gaze, human, human experiment, Parkinson disease, problem solving, task performance, visual field, visual stimulation, Aged, Attention, Case-Control Studies, Cognition, Eye Movements, Humans, Memory, Short-Term, Middle Aged, Neuropsychological Tests, Reaction Time, Severity of Illness Index
Subjects:C Biological Sciences > C800 Psychology
Divisions:College of Social Science > School of Psychology
ID Code:10546
Deposited On:08 Jul 2013 17:04

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