Right parietal lesions, unilateral spatial neglect, and the egocentric frame of reference

Recently, the hypothesis has been proposed that the crucial mechanism leading to neglect is the disturbed transformation of sensory input into a supramodal egocentric frame of reference (ER), which causes in turn a deviation of this reference frame toward the side ipsilateral to the brain lesion. Th...

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Bibliographic Details
Published in:NeuroImage (Orlando, Fla.) Vol. 20; pp. S75 - S81
Main Author: Chokron, Sylvie
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01.11.2003
Elsevier Limited
Subjects:
Behavior
Brain
Brain - pathology
Functional Laterality - physiology
Humans
Hypotheses
Magnetic Resonance Imaging - methods
Parietal Lobe - pathology
Perceptual Disorders - diagnosis
Perceptual Disorders - pathology
ISSN:1053-8119, 1095-9572
Online Access:Get full text
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Summary:Recently, the hypothesis has been proposed that the crucial mechanism leading to neglect is the disturbed transformation of sensory input into a supramodal egocentric frame of reference (ER), which causes in turn a deviation of this reference frame toward the side ipsilateral to the brain lesion. This egocentric coordinate system is normally centered on the midsagittal plane, but a unilateral brain lesion may cause a deviation of the egocentric reference due to an imbalance between the differentially lateralized neural processes which build this representation. Although neglect signs are often defined in an egocentric frame, and an ER shift may be observed in some right-brain-damaged patients (RBD), I present here several data that rule out any causal link between the deviation of the egocentric reference and the presence and/or severity of left-neglect signs in RBD patients.
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ISSN:1053-8119
1095-9572
DOI:10.1016/j.neuroimage.2003.09.002