May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
Non-lateralized impairments in anti- but not pro-pointing in patients with hemispatial neglect
Author Affiliations
  • Stéphanie Rossit
    Department of Psychology, University of Glasgow, 58 Hillhead Street, Glasgow, G12 8QB, Scotland, UK
  • Keith Muir
    Department of Neurology and Care of the Elderly, Southern General Hospital, Glasgow, Scotland, UK
  • Ian Reeves
    Department of Neurology and Care of the Elderly, Southern General Hospital, Glasgow, Scotland, UK
  • George Duncan
    Department of Neurology and Care of the Elderly, Southern General Hospital, Glasgow, Scotland, UK
  • Katrina Livingstone
    Department of Neurology and Care of the Elderly, Southern General Hospital, Glasgow, Scotland, UK
  • Hazel Jackson
    Department of Neurology and Care of the Elderly, Southern General Hospital, Glasgow, Scotland, UK
  • Pauline Castle
    Department of Neurology and Care of the Elderly, Southern General Hospital, Glasgow, Scotland, UK
  • Monika Harvey
    Department of Psychology, University of Glasgow, 58 Hillhead Street, Glasgow, G12 8QB, Scotland, UK
Journal of Vision May 2008, Vol.8, 50. doi:10.1167/8.6.50
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      Stéphanie Rossit, Keith Muir, Ian Reeves, George Duncan, Katrina Livingstone, Hazel Jackson, Pauline Castle, Monika Harvey; Non-lateralized impairments in anti- but not pro-pointing in patients with hemispatial neglect. Journal of Vision 2008;8(6):50. doi: 10.1167/8.6.50.

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Abstract

It has been widely shown that hemispatial neglect manifests itself in a rightward perceptual bias, but whether this bias extends to goal-directed movements remains a matter of debate. Here we analysed the ability of 10 patients with hemispatial neglect to perform pro- and anti-pointing movements in response to left and rightwardly presented targets. A group of 10 age-matched healthy controls and 10 patients with right-hemisphere lesions but no neglect served as controls. In the pro-pointing condition, subjects were asked to point directly to the target, whereas in the anti-pointing condition they had to move in the opposite direction of the target (i.e. if a target was illuminated on the right subjects had to point to the equivalent target position on the left and vice-versa). In the pro-pointing condition, no impairments specific to patients with hemispatial neglect where found. However for anti-pointing, neglect specific deficits emerged: neglect patients showed greater directional errors (i.e. anti-pointing movements in the wrong direction) and were also severely disrupted in the end-point accuracy of their movements, in particular when anti-pointing rightwards in response to leftwardly presented targets. We relate these findings to the presence of impairments in movements that require specific location mapping and cannot be performed on-line.

Rossit, S. Muir, K. Reeves, I. Duncan, G. Livingstone, K. Jackson, H. Castle, P. Harvey, M. (2008). Non-lateralized impairments in anti- but not pro-pointing in patients with hemispatial neglect [Abstract]. Journal of Vision, 8(6):50, 50a, http://journalofvision.org/8/6/50/, doi:10.1167/8.6.50. [CrossRef]
Footnotes
 This work was funded by a grant (SFRH/BD/23230/2005) from the Portuguese Foundation for Science and Technology to S Rossit
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