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    Testing the activation–orientation account of spatial attentional asymmetries using transcranial direct current stimulation

    Access Status
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    Authors
    Loftus, Andrea
    Nicholls, M.
    Date
    2012
    Type
    Journal Article
    
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    Citation
    Loftus, A.M. and Nicholls, M.E.R. 2012. Testing the activation–orientation account of spatial attentional asymmetries using transcranial direct current stimulation. Neuropsychologia. 50: pp. 2573-2576.
    Source Title
    Neuropsychologia
    DOI
    10.1016/j.neuropsychologia.2012.07.003
    ISSN
    00283932
    URI
    http://hdl.handle.net/20.500.11937/18291
    Collection
    • Curtin Research Publications
    Abstract

    The general population shows an attentional bias to the left, known as pseudoneglect. This bias is thought to be driven by higher levels of activation in right parietal areas. Using transcranial direct current stimulation (tDCS) to manipulate activation, this study examined whether tDCS over the left and right posterior parietal cortices (PPC) affects pseudoneglect. Normal participants received tDCS over the left or right PPCs (15 in each group). Pseudoneglect was measured using the greyscales task, which requires a forced-choice discrimination of luminance between two opposing luminance gradients. The greyscales task was administered both before and after; (a) anodal (b) cathodal and (c) sham tDCS. Participants who received tDCS over the left PPC demonstrated pseudoneglect for the greyscales task, which was significantly reduced by anodal tDCS, but was unaffected by sham or cathodal tDCS. In contrast, for those participants who received right PPC tDCS, pseudoneglect for the greyscales task was unaffected by tDCS. Anodal tDCS, which is known to elevate neural excitation, may have overcome lower levels of activation in the left PPC, resulting in decreased pseudoneglect. These findings provide convincing evidence in support of an activation–orientation model of pseudoneglect and have implications for models of left neglect.

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