Document Detail

Dissociable cognitive and neural mechanisms of unilateral visual neglect.
MedLine Citation:
PMID:  8255469     Owner:  NLM     Status:  MEDLINE    
We administered two experimental tasks to 16 patients with neglect following unilateral right hemisphere strokes, designed to probe processing of information in the neglected left visual field. A semantic priming/lexical decision task examined implicit processing of stimuli presented to the neglected field, and a discrimination task required explicit recognition of the same stimuli. We grouped patients according to three patterns of performance: (1) poor discrimination in the left visual field but intact priming, (2) normal priming and discrimination in both fields, and (3) normal priming but poor discrimination in both fields. Although patients in group 1 had posterior lesions, patients in groups 2 and 3 had extensive deep anterior lesions. These results suggest that the clinical phenomenon of unilateral visual neglect can be the surface manifestation of deficits in two different and interacting processes--attentional processes (group 1) and intentional processes (group 2)--or it may be a global attentional disturbance superimposed on these deficits (group 3).
M D'Esposito; R McGlinchey-Berroth; M P Alexander; M Verfaellie; W P Milberg
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Neurology     Volume:  43     ISSN:  0028-3878     ISO Abbreviation:  Neurology     Publication Date:  1993 Dec 
Date Detail:
Created Date:  1994-01-13     Completed Date:  1994-01-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401060     Medline TA:  Neurology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2638-44     Citation Subset:  AIM; IM    
Department of Neurology, Boston University School of Medicine, Braintree Hospital, MA.
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MeSH Terms
Brain / physiopathology*
Cerebrovascular Disorders / physiopathology*,  psychology*
Decision Making
Discrimination (Psychology)
Functional Laterality
Middle Aged
Neuropsychological Tests
Reaction Time
Visual Fields*

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

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