Document Detail


Visual contribution to postural stability: Interaction between target fixation or tracking and static or dynamic large-field stimulus.
MedLine Citation:
PMID:  19775892     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Stationary visual information has a stabilizing effect on posture, whereas moving visual information is destabilizing. We compared the influence of a stationary or moving fixation point to the influence of stationary or moving large-field stimulation, as well as the interaction between a fixation point and a large-field stimulus. We recorded body sway in 20 healthy subjects who were fixating a stationary or oscillating dot (vertical or horizontal motion, 1/3 Hz, +/-12 degrees amplitude, distance 96 cm). In addition, a large-field random dot pattern (extension: approximately 80 x 70 degrees) was stationary, moving or absent. Visual fixation of a stationary dot in darkness did not reduce antero-posterior (AP) sway compared to the situation in total darkness, but slightly reduced lateral sway at frequencies below 0.5 Hz. In contrast, fixating a stationary dot on a stationary large-field pattern reduced both AP and lateral body sway at all frequencies (0.1-2 Hz). Ocular tracking of the oscillating dot caused a peak in body sway at 1/3 Hz, i.e. the stimulus frequency, but there was no influence of large-field stimulus at this frequency. A stationary large-field pattern, however, reduced AP and lateral sway at frequencies between 0.1 and 2 Hz when subjects tracked a moving dot, compared to tracking in darkness. Our results demonstrate that a stationary large-field pattern has a stabilizing effect in all conditions, independent of whether the eyes are fixing on a stationary target or tracking a moving target.
Authors:
J Laurens; L Awai; C J Bockisch; S Hegemann; H J A van Hedel; V Dietz; D Straumann
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-22
Journal Detail:
Title:  Gait & posture     Volume:  31     ISSN:  1879-2219     ISO Abbreviation:  Gait Posture     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-02-03     Completed Date:  2010-05-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  England    
Other Details:
Languages:  eng     Pagination:  37-41     Citation Subset:  IM    
Copyright Information:
Copyright 2009 Elsevier B.V. All rights reserved.
Affiliation:
Neurology Department, Z?rich University Hospital, Switzerland. jean.laurens@gmail.com
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Eye Movements
Female
Fixation, Ocular*
Humans
Male
Middle Aged
Motion Perception / physiology*
Photic Stimulation
Postural Balance / physiology*

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


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