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Impairments of oculomotor control in a patient with a right temporo-parietal lesion

Butler, S.H. and Gilchrist, I.D. and Ludwig, C.J.H. and Muir, K. and Harvey, M. (2006) Impairments of oculomotor control in a patient with a right temporo-parietal lesion. Cognitive Neuropsychology, 23 (6). pp. 990-999. ISSN 0264-3294

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Abstract

Goal-driven control over saccade target selection requires the inhibition of task-irrelevant, stimulus-driven saccades. A widely held assumption is that frontal structures are of critical importance for this function. Here we report the oculomotor capture behaviour of a patient with a right temporo-parietal lesion, which challenges this view. T.H. was asked to search for a target among distractors and to signal its location with a saccade. A task-irrelevant, additional distractor appeared with or without abrupt onset, and it was either similar or dissimilar in its colour to the target. Compared to controls, T.H. showed an elevated level of capture overall. He also showed spatial extinction, which was partially overridden by an abrupt onset distractor. These results support the view that effective oculomotor control depends on an intact network of frontal and posterior brain regions. We argue that stimulus-driven and goal-driven signals are computed at different stages, but are ultimately combined in a common functional salience map.

Item type: Article
ID code: 5146
Keywords: cognitive neuropsychology, cognitive psychology, lateral intraparietal area, stimulus-driven, attentional capture, visual selection, abrupt onset, antisaccade, Psychology, Neuropsychology and Physiological Psychology, Cognitive Neuroscience, Experimental and Cognitive Psychology
Subjects: Philosophy. Psychology. Religion > Psychology
Department: Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Psychology
Faculty of Science > Physics
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    Depositing user: Strathprints Administrator
    Date Deposited: 10 Jan 2008
    Last modified: 04 Sep 2014 17:28
    URI: http://strathprints.strath.ac.uk/id/eprint/5146

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