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Related Experiment Videos

An oral tactile interface for blind navigation.

Hui Tang1, David J Beebe

  • 1Department of Biomedical Engineering, University of Wisconsin-Madison, USA. tanghu@missouri.edu

IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|March 28, 2006
PubMed
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A new oral tactile interface offers directional guidance for blind travelers. While left/right cues were accurately identified, forward/backward cues showed varied user performance.

Area of Science:

  • Human-Computer Interaction
  • Assistive Technology
  • Sensory Substitution

Background:

  • Blind travelers require effective navigation aids for outdoor mobility.
  • Tactile feedback offers a potential channel for transmitting directional information.
  • Existing assistive technologies often lack intuitive directional cueing.

Purpose of the Study:

  • To design and evaluate an oral tactile interface for directional guidance.
  • To assess the feasibility of electrotactile stimulation on the palate for navigation cues.
  • To determine user perception and accuracy of directional cues delivered orally.

Main Methods:

  • Developed an oral interface with an electrotactile display (palate) and tongue keypad.
  • Presented directional cues (left, right, forward, backward) via electrotactile patterns.

Related Experiment Videos

  • Conducted experiments measuring sensation thresholds and cue identification accuracy with six subjects.

    • Main Results:

    • Palatal electrotactile stimulation required 15V for threshold and 25-30V for comfortable perception.
    • High accuracy was achieved in identifying leftward and rightward directional cues.
    • Performance in distinguishing forward and backward cues varied significantly among participants.

    Conclusions:

    • The oral tactile interface is a viable concept for delivering directional guidance.
    • Electrotactile stimulation on the palate can effectively convey directional information.
    • Further research is needed to optimize forward/backward cue perception for improved navigation.