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Prism adaptation and spatial attention: A study of visual search in normals and patients with unilateral neglect

Morris, A. P., Kritikos, A., Berberovic, N., Pisella, L., Chambers, Christopher D. and Mattingley, J. B. 2004. Prism adaptation and spatial attention: A study of visual search in normals and patients with unilateral neglect. Cortex 40 (4-5) , pp. 703-721. 10.1016/S0010-9452(08)70166-7

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Visuomotor adaptation to a prism-induced lateral displacement of the visual field induces mild perceptual biases in healthy individuals and improves symptoms of unilateral neglect. The present study employed a speeded visual search task to test the hypothesis that prism adaptation induces an adaptive redistribution of selective spatial attention. In Experiment 1, 32 neurologically healthy, right-handed participants were adapted to a 15° prism–induced lateral (left or right) displacement of the visual field. Spatial attention was measured by search time and error-rate in unique-feature (“preattentive”) and feature-absent (“serial”) visual search tasks, before and after prism adaptation. The single target appeared at different locations within arrays of 12, 24 or 48 items. Contrary to the attentional hypothesis, the pattern of search performance across the display remained unchanged following prism adaptation. In Experiment 2, we tested four patients with unilateral right hemisphere damage on the visual search tasks, before and after adaptation to 15° rightward-displacing prisms. All four patients showed a pathological gradient of spatial attention toward the ipsilesional side prior to adaptation. Consistent with the results from Experiment 1, the gradient in search performance shown by the patients did not change following prism adaptation. Taken together, these findings suggest that the perceptual aftereffects in normals and amelioration of unilateral neglect following prism adaptation are not mediated by an adaptive redistribution of spatial attention.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: prism adaptation; attention; spatial neglect; right hemisphere; visual search; aftereffects
Publisher: Elsevier
ISSN: 0010-9452
Last Modified: 04 Jun 2017 04:08

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