Document Detail


Position of the egocentric reference and performance in line bisection and subjective vertical estimation tasks.
MedLine Citation:
PMID:  11527369     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Egocentric body coordinates such as the sagittal midline have been proposed to act as a reference for ballistic movements in extracorporeal space. Symmetrical functioning of the multiple neural structures processing sensory information would account for the normal sagittal position of the egocentric reference. According to this hypothesis a unilateral parietal lesion would induce a ipsilesional deviation which would prevent neglect patients from responding to stimuli that occur on that side. In this line of reasoning, an experimental manipulation of the position of the egocentric reference by way of a postural perturbation should have an effect on visuospatial tasks performance in normal subjects. Seventeen right-handed subjects were submitted in the dark to two visuomotor tasks: the adjustment of a luminescent rod to the vertical and the bisection of a luminescent line, either with the trunk and the head aligned at 0 degrees or with a 30 degrees trunk rotation to the right or to the left. Results revealed no significant effect of trunk rotation on the performance in both tasks. We discuss these findings and their implication for the understanding of the neglect syndrome.
Authors:
P Colliot; T Ohlmann; S Chokron
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain and cognition     Volume:  46     ISSN:  0278-2626     ISO Abbreviation:  Brain Cogn     Publication Date:    2001 Jun-Jul
Date Detail:
Created Date:  2001-08-30     Completed Date:  2001-12-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8218014     Medline TA:  Brain Cogn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  82-6     Citation Subset:  IM    
Affiliation:
Laboratoire de Psychologie Expérimentale, CNRS, EP617, UPMF, Grenoble, France.
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MeSH Terms
Descriptor/Qualifier:
Adult
Female
Functional Laterality / physiology
Humans
Motion Perception / physiology*
Parietal Lobe / physiology*
Posture / physiology
Space Perception / physiology*
Visual Fields / physiology

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


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