Document Detail

Head and body sway in response to vertical visual stimulation.
MedLine Citation:
PMID:  16158533     Owner:  NLM     Status:  MEDLINE    
CONCLUSIONS: Postural responses differed according to the stimulus direction, i.e. vertical visual stimulation induced head rather than trunk displacements. Accordingly, it could be that center of foot pressure (COP) responses tended to underestimate the postural sway during visual stimulation. OBJECTIVES: To investigate head and body sway in response to vertical visual surround motion, and to examine the correlation between the displacements of head and body segments derived from video-motion analysis and COP measurements. MATERIAL AND METHODS: Postural sway was assessed in 10 young female subjects by video-motion analysis of four different head and body segments, and by use of force-plate posturography. Head and body sway in the pitch plane was induced by rotating a random pattern of dots about the subject's inter-aural axis at a constant acceleration of 1 degree/s(2) or a constant velocity of 60 degrees/s in darkness. RESULTS: Generally, head displacement was greater than that of other body parts during vertical optokinetic stimulation (OKS). In most subjects, maximum head displacements were induced in the same direction as the visual motion. Downward OKS induced a forward head and body sway. The COP trajectory correlated well with the displacements of each head and body segment during downward OKS. In contrast, postural responses to upward OKS were complicated in terms of their time course. The correlation coefficient between each head and body segment and the COP varied among individuals for upward OKS.
Kenji Kobayashi; Hiroaki Fushiki; Masatsugu Asai; Yukio Watanabe
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta oto-laryngologica     Volume:  125     ISSN:  0001-6489     ISO Abbreviation:  Acta Otolaryngol.     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-09-13     Completed Date:  2006-07-07     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370354     Medline TA:  Acta Otolaryngol     Country:  Norway    
Other Details:
Languages:  eng     Pagination:  858-62     Citation Subset:  IM    
Department of Otolaryngology, Toyama Medical and Pharmaceutical University, Toyama, Japan.
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MeSH Terms
Photic Stimulation / methods*
Postural Balance*
Posture / physiology*
Videotape Recording
Visual Perception / physiology*

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

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