Document Detail

Assessment of vibrotactile feedback on postural stability during pseudorandom multidirectional platform motion.
MedLine Citation:
PMID:  19932987     Owner:  NLM     Status:  MEDLINE    
This study uses frequency-domain techniques and stabilogram diffusion analysis (SDA) to investigate the effect of vibrotactile feedback during continuous multidirectional perturbations of a support platform. Eight subjects with vestibular deficits were subjected to two-axis pseudorandom surface platform motion while donning a multiaxis vibrotactile feedback device that mapped body tilt estimates onto their torsos via a 3-row by 16-column array of tactile vibrators (tactors). Four tactor display configurations with spatial resolutions ranging between 22.5 degrees and 90 degrees, in addition to the tactors off configuration, were evaluated. Power spectral density functions of body sway in the anterior-posterior (A/P) and medial-lateral (M/L) directions, and transfer functions between platform motion and body sway, were computed at frequencies ranging from 0.0178 to 3.56 Hz. Cross-spectral analysis revealed that the A/P responses were not significantly driven by M/L inputs, and vice versa, thus supporting the notion of independent A/P and M/L postural control. Vibrotactile feedback significantly decreased A/P and M/L spectral power, decreased transfer function gains up to a frequency of 1.8 and 0.6 Hz in the A/P and M/L directions, respectively, and increased phase leads above 0.3 Hz. SDA showed significantly decreased transition time for both A/P and M/L tilts, and decreased transition displacement and short-term diffusion coefficients for A/P tilt. However, the spatial resolution of the tactor displays did not affect subjects' performance, thereby supporting the use of a lower spatial resolution display in future device designs.
Kathleen H Sienko; Vivek V Vichare; M David Balkwill; Conrad Wall
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2009-11-20
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  57     ISSN:  1558-2531     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-07-27     Completed Date:  2010-11-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  944-52     Citation Subset:  IM    
Department ofMechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
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MeSH Terms
Biomedical Engineering
Data Interpretation, Statistical
Feedback, Sensory / physiology*
Least-Squares Analysis
Monitoring, Ambulatory / methods*
Postural Balance / physiology*
Signal Processing, Computer-Assisted*
Touch / physiology*
Vestibular Diseases / therapy*
Grant Support

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

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