Document Detail

Processing of illusion of length in spatial hemineglect: a study of line bisection.
MedLine Citation:
PMID:  10775718     Owner:  NLM     Status:  MEDLINE    
Bisection of horizontal lines and of the Brentano form of the Müller-Lyer illusion was investigated in six right brain-damaged patients with left spatial hemineglect, and in six control subjects. Patients bisected the lines to the right of the objective mid-point. Comparable illusory effects on line bisection were however found in both patients and control subjects. Relative to the baseline condition, in both groups the subjective midpoint was displaced towards the side expanded by the illusion, both leftwards and rightwards. By contrast, line length and spatial position of the stimulus had differential effects. In neglect patients, the rightward bisection error increased disproportionately with line length, and when the stimulus was located in the left, neglected, side of egocentric space. Control subjects showed no such effects. The suggestion is made that the visual, non-egocentric, processes underlying these illusory effects of length may be spared in patients with left spatial neglect. The possible neural basis of this dissociation is discussed.
G Vallar; R Daini; G Antonucci
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuropsychologia     Volume:  38     ISSN:  0028-3932     ISO Abbreviation:  Neuropsychologia     Publication Date:  2000  
Date Detail:
Created Date:  2000-07-12     Completed Date:  2000-07-12     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0020713     Medline TA:  Neuropsychologia     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1087-97     Citation Subset:  IM    
Università degli Studi di Milano-Bicocca, Dipartimento di Psicologia, Edificio U-6, Piazza dell'Ateneo Nuovo 1, 20126, Milan, Italy.
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MeSH Terms
Brain Damage, Chronic / physiopathology,  psychology*,  radiography
Cognition Disorders / physiopathology,  psychology*,  radiography
Illusions / psychology*
Middle Aged
Neuropsychological Tests
Photic Stimulation
Tomography, X-Ray Computed
Visual Perception / physiology*

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

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