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

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


Author Morris, Adam P.
Kritikos, Ada
Berberovic, Nadja
Pisella, Laure
Chambers, Christopher D.
Mattingley, Jason B.
Title Prism adaptation and spatial attention: A study of visual search in normals and patients with unilateral neglect
Journal name Cortex   Check publisher's open access policy
ISSN 0010-9452
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1016/S0010-9452(08)70166-7
Volume 40
Issue 4-5
Start page 703
End page 721
Total pages 19
Place of publication Milan
Publisher Masson Divisione Periodici
Language eng
Abstract 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 15degrees 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 15degrees 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.
Keyword Behavioral Sciences
Neurosciences
prism adaptation
attention
spatial neglect
right hemisphere
visual search
aftereffects
Hemispatial Neglect
Line Bisection
Visuospatial Neglect
Parietal Lobe
Eye-movements
Orientation
Stimulation
Judgments
Damage
Space
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Queensland Brain Institute Publications
School of Psychology Publications
 
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Created: Wed, 17 Oct 2007, 23:11:29 EST