ERIC Number: EJ871742
Record Type: Journal
Publication Date: 2010-Mar
Abstractor: As Provided
Reference Count: 0
"Where Is the Sun" for Hemi-Neglect Patients?
de Montalembert, M.; Auclair, L.; Mamassian, P.
Brain and Cognition, v72 n2 p264-270 Mar 2010
Human observers use prior constraints to disambiguate a scene; in particular, light is preferentially seen as coming from above but also slightly from the left. One explanation of this lateral bias could be a cerebral hemispheric difference. The aim of the present study was to determine the preferred light source position for neglect patients. For this purpose, we used the ambiguous shaded "Polo Mint" stimulus, a ring divided into eight equal sectors. All sectors but one were the same shape, convex or concave, as determined by the light source position. Participants had to report the side (left or right) of the odd sector or, in a separate experiment, to report its shape (convex or concave). Eight patients with spatial neglect (left neglect N = 7, right neglect N = 1) after a right or left temporo-parietal or thalamic lesion and 14 control participants ran the experiment. Left neglect patients showed a significantly different light bias from the bias observed for controls and for the right neglect patient (i.e., a reduction of the left bias or a right bias rather than a left bias). We conclude that some disabilities presented by patients with spatial neglect may be due to difficulties processing information that is not present in the visual field or imagined in the representational scene. (Contains 2 figures and 1 table.)
Descriptors: Patients, Lighting, Brain Hemisphere Functions, Spatial Ability, Visual Stimuli, Neurological Impairments, Control Groups, Disabilities, Cognitive Processes
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A