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The neural basis of visuomotor deficits in hemispatial neglect

Author(s): S. Rossit, P. Malhotra, K. Muir, I. Reeves, G. Duncan, P. Birschel, M. Harvey

We have recently reported that patients with hemispatial neglect demonstrate increased terminal errors when performing delayed leftward reaches and that right-brain damaged patients (irrespective of neglect) take longer to complete their movements [Rossit, S., Muir, K., Reeves, L, Duncan, G., Birschel, P., & Harvey, M. (2009). Immediate and delayed reaching in hemispatial neglect. Neuropsychologiaa 47, 1563-1573]. Here we conducted an initial voxel-based lesion-symptom analysis to examine the neural basis of such deficits in 21 right-brain damaged subjects with 11 patients suffering from hemispatial neglect (2 more than in Rossit et al. [Rossit S., Muir K., Reeves L, Duncan, G., Birschel, R, & Harvey, M. (2009). Immediate and delayed reaching in hemispatial neglect. Neuropsychologia 47, 1563-1573] and 10 control patients without the condition. We found that the accuracy impairments in delayed leftward reaches were associated with damage to occipito-temporal areas. In contrast, the movement time slowing was related to more anterior lesions in the frontal lobe. These findings agree with the view that neglect affects actions thought to depend on the processing carried out by the ventral visual stream. In addition, we suggest that the timing impairments which are not neglect-specific maybe be driven by frontal structures. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

Full version: Available here

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ISBN: 0028-3932
Publication Year: 2009
Periodical: Neuropsychologia
Periodical Number: 10
Volume: 47
Pages: 2149-2153
Author Address: