The effects of stimulus symmetry on Landmark judgments in left and right visual fields

Wilkinson, David T. and Halligan, Peter W. (2002) The effects of stimulus symmetry on Landmark judgments in left and right visual fields. Neuropsychologia , 40 (7). pp. 1045-1058. ISSN 0028-3932 . (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Line bisection impairment is greater following right compared to left hemisphere damage, suggesting that some of the underlying visuo-spatial mechanisms may be lateralised. One important perceptual component of line bisection is estimating stimulus midpoint. Here, we used a modified version of the perceptual landmark task to examine, in healthy individuals, how the midpoint of a stimulus is apprehended, and if the cerebral hemispheres are equally as efficient in performing such a task. We show that the right, relative to the left, hemisphere is both faster and more accurate at apprehending prebisected lines, but no better at apprehending misbisected lines. We then demonstrate that the right hemisphere advantage stems from a specialisation in detecting stimulus symmetry; by associating prebisected lines with the presence of display symmetry, transect location can be inferred without having to explicitly calculate the midpoint of lines. The findings provide a further reason why right hemisphere damage is so deterimental to perceptual line bisection. In addition, the data indicate that the detection of visual symmetry is preferentially lateralised to the right hemisphere

Item Type: Article
Uncontrolled keywords: cerebral hemispheres; pseudoneglect; line bisection
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculties > Social Sciences > School of Psychology
Depositing User: C.A. Simms
Date Deposited: 06 Sep 2008 08:38
Last Modified: 02 Jun 2014 11:23
Resource URI: (The current URI for this page, for reference purposes)
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