Document Detail

Determining the effectiveness of a vibrotactile balance prosthesis.
MedLine Citation:
PMID:  16917168     Owner:  NLM     Status:  MEDLINE    
We present a quantitative method for characterizing the effectiveness of a balance prosthesis based on tactile vibrators. The balance prosthesis used an array of 12 tactile vibrators (tactors) placed on the anterior and posterior surfaces of the torso to provide body orientation feedback related to the angular position and velocity of anterior-posterior body sway. Body sway was evoked in subjects with normal sensory function and in vestibular loss subjects by rotating the support surface upon which a test subject stood with eyes closed. Tests were performed both with (tactor trials) and without (control trials) the prosthesis activated. Several amplitudes of support surface stimulation were presented with each stimulus following a pseudorandom motion profile. For each stimulus amplitude, a transfer function analysis characterized the amplitude (gain) and timing (phase) of body sway evoked by the support surface stimulus over a frequency range of 0.017 to 2.2 Hz. A comparison of transfer function results from the control trials of normal subjects with results from tactor trials of vestibular loss subjects provided a quantitative measure of the effectiveness of the balance prosthesis in substituting for missing vestibular information. Although this method was illustrated using a specific balance prosthesis, the method is general and could be applied to balance prostheses that utilize other technology.
Robert J Peterka; Conrad Wall; Erna Kentala
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Publication Detail:
Type:  Controlled Clinical Trial; Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Journal of vestibular research : equilibrium & orientation     Volume:  16     ISSN:  0957-4271     ISO Abbreviation:  J Vestib Res     Publication Date:  2006  
Date Detail:
Created Date:  2006-08-18     Completed Date:  2006-11-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9104163     Medline TA:  J Vestib Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  45-56     Citation Subset:  IM; S    
Neurological Sciences Institute, Oregon Health & Science University, Portland, 97006, USA.
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MeSH Terms
Middle Aged
Postural Balance*
Prostheses and Implants* / statistics & numerical data
Sensation Disorders / therapy*
Treatment Outcome
Vestibular Function Tests / instrumentation
Vibration / therapeutic use*
Grant Support

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

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