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    Simulating unilateral neglect in normals using prism adaptation: implications for theory.

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    Rightward deviation on line bisection is considered one of the most classic clinical signs of unilateral visual neglect-a cognitive disorder of spatial processing that commonly follows right brain damage. Recently, short-term adaptation to wedge prisms has been shown to significantly reduce neglect on this and other conventional diagnostic tasks. Our previous study has shown that visuomotor adaptation in normals produces a similar pattern of directional bias on a line bisection task. Based on the good working knowledge of how neglect patients perform on different versions of the standard diagnostic task, we showed here that using leftward-deviating prisms in normals, it is possible to produce: (1) a reliable bias on line bisection, (2) a rightward specific deviation, (3) a modulation of rightward deviation, which depends on the relative spatial location of the target lines and (4) a line length effect. A final experiment confirmed that these after-effects are specific to prism adaptation rather than passive prism exposure. Collectively, these findings confirm that adaptation to left-deviating prisms in normals produces a reliable right-sided bias and as shown by a previous visuospatial judgement task, these findings cannot be adequately explained by the symmetric sensori-motor effects of prism adaptation. Taken together with the improvement of spatial neglect shown by right-deviating prisms only, the present study suggests that low level sensori-motor adaptations play a greater role in right hemisphere organisation for spatial cognition than previously thought.

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    Description

    Title : Simulating unilateral neglect in normals using prism adaptation: implications for theory.
    Author(s) : Carine Michel, Laure Pisella, Peter W Halligan, Jacques Luauté, Gilles Rode, Dominique Boisson, Yves Rossetti
    Abstract : Rightward deviation on line bisection is considered one of the most classic clinical signs of unilateral visual neglect-a cognitive disorder of spatial processing that commonly follows right brain damage. Recently, short-term adaptation to wedge prisms has been shown to significantly reduce neglect on this and other conventional diagnostic tasks. Our previous study has shown that visuomotor adaptation in normals produces a similar pattern of directional bias on a line bisection task. Based on the good working knowledge of how neglect patients perform on different versions of the standard diagnostic task, we showed here that using leftward-deviating prisms in normals, it is possible to produce: (1) a reliable bias on line bisection, (2) a rightward specific deviation, (3) a modulation of rightward deviation, which depends on the relative spatial location of the target lines and (4) a line length effect. A final experiment confirmed that these after-effects are specific to prism adaptation rather than passive prism exposure. Collectively, these findings confirm that adaptation to left-deviating prisms in normals produces a reliable right-sided bias and as shown by a previous visuospatial judgement task, these findings cannot be adequately explained by the symmetric sensori-motor effects of prism adaptation. Taken together with the improvement of spatial neglect shown by right-deviating prisms only, the present study suggests that low level sensori-motor adaptations play a greater role in right hemisphere organisation for spatial cognition than previously thought.
    Keywords : adaptation, physiological, adolescent, adult, analysis variance, female, functional laterality, functional laterality physiology, humans, lenses, male, middle aged, neuropsychological tests, perceptual disorders, perceptual disorders diagnosis, perceptual

    Subject : unspecified
    Area : Other
    Language : English
    Year : 2003

    Affiliations Cardiff university
    Journal : Neuropsychologia
    Volume : 41
    Issue : 1
    Pages : 25-39
    Url : http://www.ncbi.nlm.nih.gov/pubmed/12427563

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    Peter's Peer Evaluation activity

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