Document Detail

The vertical-horizontal illusion in hemi-spatial neglect.
MedLine Citation:
PMID:  20624409     Owner:  NLM     Status:  MEDLINE    
The vertical-horizontal illusion is a robust phenomenon of length mis-estimation between two orthogonal lines. This illusion involves an anisotropy component that makes the vertical line appear longer than the horizontal one and a bisection component that makes the bisected line shorter than the bisecting one. Six patients presenting a moderate left hemi-neglect (N-patients) were compared to four right brain damaged patients without neglect (RH-patients) and with control participants in the perception of various spatial configurations of the vertical-horizontal illusion. Relative to controls, we found that both components of the illusion increased in patients: the anisotropy component rose from 5 to 11% and 10% (for N- and RH-patients, respectively) and the bisection component from 17 to 22% and 20% (for N- and RH-patients, respectively). In addition, we found that an horizontal-'T' figure oriented to the left produced much less bias than the same figure oriented to the right. These results are discussed in light of explanations based on attentional disengagement from an image junction and strength of the representation of objects extending over the neglected side.
M de Montalembert; P Mamassian
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Publication Detail:
Type:  Journal Article     Date:  2010-07-17
Journal Detail:
Title:  Neuropsychologia     Volume:  48     ISSN:  1873-3514     ISO Abbreviation:  Neuropsychologia     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-23     Completed Date:  2010-12-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0020713     Medline TA:  Neuropsychologia     Country:  England    
Other Details:
Languages:  eng     Pagination:  3245-51     Citation Subset:  IM    
Copyright Information:
Copyright 2010 Elsevier Ltd. All rights reserved.
Laboratoire Psychologie de la Perception (CNRS UMR 8158), Université Paris Descartes, Paris, France.
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MeSH Terms
Functional Laterality / physiology
Middle Aged
Neuropsychological Tests
Optical Illusions / physiology*
Perceptual Disorders / psychology*
Photic Stimulation
Stroke / complications,  psychology
Visual Perception / physiology*

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