Document Detail


Modulation of the directional attention deficit in visual neglect by hemispatial factors.
MedLine Citation:
PMID:  8373569     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Using a visuo-spatial cuing paradigm, Posner and collaborators (Posner, Cohen, & Rafal, 1982; Posner, Walker, Friedrich, & Rafal, 1984) reported that subjects with a parietal lobe lesion have difficulty in disengaging their visual attention from an invalidly precued location in the ipsilesional hemifield when the target they have to respond to is presented in the contralesional field. Later, these authors (Posner, Walker, Friedrich, & Rafal, 1987) proposed that this disengagement deficit is one involving spatial shifts of attention in a contralesional direction, irrespective of the visual hemifield in which the target is presented. This proposal of a directional disengagement deficit along the horizontal axis, present in either hemifield, contrasts with a report by Baynes, Holtzman, & Volpe (1986) showing, in right parietal subjects, a disengagement deficit for shifts of attention along the vertical axis that is only manifest in the contralesional hemifield. In the present report, we assessed the disengagement deficit of a neglect subject along the horizontal and vertical axes. Results show a disengagement deficit restricted to shifts of attention in the contralesional direction (horizontal axis), which is significant only in the contralesional visual hemifield. However, there is a clear trend for a directional disengagement deficit in the ipsilateral field. These observations indicate that the attention deficit present in neglect is directional and is modulated either by hemispatial factors or by the lateral target location in the visual field. On the basis of the present results, it is proposed that the deficit of parietal subjects may best be conceptualized as one of attentional capture for stimuli located on the contralesional side of the current focus of attention rather than one of disengagement.
Authors:
M Arguin; D Bub
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Publication Detail:
Type:  Case Reports; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain and cognition     Volume:  22     ISSN:  0278-2626     ISO Abbreviation:  Brain Cogn     Publication Date:  1993 Jul 
Date Detail:
Created Date:  1993-10-15     Completed Date:  1993-10-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8218014     Medline TA:  Brain Cogn     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  148-60     Citation Subset:  IM    
Affiliation:
Montreal Neurological Institute, Quebec, Canada.
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MeSH Terms
Descriptor/Qualifier:
Aged
Attention*
Brain / physiopathology*
Brain Diseases / physiopathology*
Female
Functional Laterality
Humans
Parietal Lobe / physiopathology
Reaction Time
Space Perception*
Visual Fields*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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