Paradoxical extension into the contralesional hemispace in spatial neglect

Bigna Lenggenhager, Tobias Loetscher, Nicole Kavan, Gianandrea Pallich, Amy Brodtmann, Michael Nicholls, Peter Brugger

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    Abstract

    To explore the idea of a perceptual distortion of space in spatial neglect, neglect patients, age-matched healthy controls and right hemisphere control patients judged the vanishing point of horizontally and vertically-moving stimuli. Hemifield of presentation and movement direction of the stimulus presentation was manipulated. The results suggest that neglect patients show a stronger response bias in the direction of the moving stimuli (" representational momentum") than healthy and right hemisphere controls. Furthermore, neglect patients, but not the control groups, showed a direction-specific response whereby the presence of neglect was associated with a larger representational momentum for leftward-moving stimuli. The one left-hemisphere patient with right-sided neglect showed the opposite effect. Thus, neglect patients showed a relative overextension into their neglected side of space. While these findings are in line with the idea of an extension in the representation of contralesional space, other explanations such as deficient spatial remapping, impairments in smooth pursuit and distortions in memorized visuo-motor movements are considered.

    Original languageEnglish
    Pages (from-to)1320-1328
    Number of pages9
    JournalCortex
    Volume48
    Issue number10
    DOIs
    Publication statusPublished - 2012

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    Lenggenhager, B., Loetscher, T., Kavan, N., Pallich, G., Brodtmann, A., Nicholls, M., & Brugger, P. (2012). Paradoxical extension into the contralesional hemispace in spatial neglect. Cortex, 48(10), 1320-1328. https://doi.org/10.1016/j.cortex.2011.10.003