Electrotactile feedback of sway position improves postural performance during galvanic vestibular stimulation

Scott J. Wood, F. Owen Black, Hamish G. MacDougall, Steven T. Moore

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

19 Scopus citations

Abstract

The purpose of this study was to assess the influence of electrotactile feedback on postural control performance during binaural galvanic vestibular stimulation (GVS). Postural equilibrium was measured with a computerized hydraulic platform in 10 healthy adults (6M, 4F, 24-65 y). Feedback of anterior-posterior (AP) and mediallateral (ML) body sway was derived from a 2-axis linear accelerometer mounted on a torso belt and displayed on a 144-point electrotactile array held against the anterior dorsal tongue. Subjects were trained to use the tongue electrotactile feedback (TEF) by voluntarily swaying to draw figures on their tongue, both with and without GVS. Subjects performed 24 randomized trials (20-s duration with eyes closed, 2 trials per condition), including 4 support surface conditions (fixed, rotational sway-referenced, translating the support surface proportional to AP sway, and combined rotational-translational support-platform sway referencing), and 3 feedback conditions (baseline, GVS, and GVS with TEF). Postural performance was assessed using deviations from upright (peak-to-peak and root-mean-square sway) and convergence toward stability limits (time and distance to limit of support boundaries). Postural stability was impaired (with respect to baseline) during GVS in all platform conditions, with larger decrements in performance during trials with rotation sway-referencing. Electrotactile feedback improved performance with GVS toward non-GVS levels, especially during trials with rotation sway-referencing. These results demonstrate the effectiveness of TEF in providing sensory substitution to maintain postural stability during vestibular disturbances.

Original languageEnglish
Title of host publicationBasic and Clinical Aspects of Vertigo and Dizziness
PublisherBlackwell Publishing Inc.
Pages492-498
Number of pages7
ISBN (Print)9781573317177
DOIs
StatePublished - May 2009

Publication series

NameAnnals of the New York Academy of Sciences
Volume1164
ISSN (Print)0077-8923
ISSN (Electronic)1749-6632

Keywords

  • Biofeedback
  • Posturography
  • Translation

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