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Vibrotactile display coding for a balance prosthesis.

Prajoy P Kadkade1, Brian J Benda, Patricia B Schmidt

  • 1Department of Otolaryngology/Head & Neck Surgery, New York Presbyterian-The University Hospitals of Columbia and Cornell, New York, NY 10032, USA.

IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|February 13, 2004
PubMed
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This study evaluated vibrotactile display schemes for balance prostheses. Position-based coding significantly outperformed interval-based coding in a critical tracking task, suggesting better potential for balance rehabilitation.

Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Human Factors

Background:

  • Balance prostheses can utilize vibrotactile feedback to convey tilt information.
  • Evaluating numerous vibrotactile display schemes is crucial but time-consuming.
  • A quantitative method is needed to assess display schemes independently.

Purpose of the Study:

  • To quantitatively evaluate and compare different vibrotactile display schemes for tilt information.
  • To select the most promising schemes for future balance prosthesis development.
  • To validate the performance of selected schemes in a balance task.

Main Methods:

  • A modified critical tracking task (CTT) was used to measure performance with vibrotactile feedback.
  • Four vibrotactile coding schemes (one interval-based, three position-based) were tested on 11 healthy subjects.

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  • Performance was quantified by the critical lambda (lambda(c)), the difficulty level at which control is lost.

    • Main Results:

    • Position-based vibrotactile coding schemes yielded significantly higher critical lambda (lambda(c)) values than interval-based coding.
    • Increasing the number of tactors in position-based schemes (3 to 7) did not significantly alter performance.
    • Preliminary balance studies confirmed superior performance with position-based displays during quiet standing.

    Conclusions:

    • Position-based vibrotactile coding is a more effective method for conveying tilt information compared to interval-based coding.
    • The critical tracking task provides a reliable quantitative measure for evaluating vibrotactile display schemes.
    • These findings support the development of advanced vibrotactile feedback systems for balance rehabilitation.