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Visual Neglect in Horizontal and Radial Space: When Left Goes Right, Proximal Goes Distal

Published online by Cambridge University Press:  15 July 2011

David Wilkinson  and
Mohamed Sakel
David Wilkinson*
Affiliation:
School of Psychology, University of Kent, United Kingdom
Mohamed Sakel
Affiliation:
East Kent Neuro-Rehabilitation Service, East Kent Hospitals University NHS Foundation Trust, United Kingdom
*
Correspondence and reprint requests to: David Wilkinson, School of Psychology, University of Kent, Canterbury, Kent, CT2 7NP, United Kingdom. E-mail: dtw@kent.ac.uk
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Abstract

Hemi-spatial neglect can manifest in both the horizontal and radial spatial plane. However, debate exists over how closely the two forms of neglect relate. Here we compared the ability of a neglect patient to bisect stimuli in horizontal versus radial orientation. When oriented horizontally, single lines were mis-bisected to the right, yet when surrounded by visual distracters, the lines were mis-bisected to the left. A leftward bias also emerged when horizontally aligned strings of symbols were bisected. Unexpectedly, an analogous pattern of bias appeared when the stimuli were bisected in radial orientation; stimuli that induced a leftward bias now induced a proximal bias, while stimuli that induced a rightward bias induced a distal bias. Spontaneous reversals in radial bias have not been previously reported, and given that they were coupled with the horizontal reversals, suggest that the spatial boundaries of horizontal and radial neglect are strongly constrained by common stimulus configurations. (JINS, 2011, 17, 943–947)

Keywords

IpsilesionalContralesionalAttentionStimulus bisectionPerceptual disorderCerebral hemisphere
Type
Neurobehavioral Grand Rounds
Information
Journal of the International Neuropsychological Society , Volume 17 , Issue 5 , September 2011 , pp. 943 - 947
Copyright
Copyright © The International Neuropsychological Society 2011

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