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Related Experiment Video

Updated: Jun 9, 2025

Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique
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Perceived auditory dynamic range is enhanced with wrist-based tactile stimulation.

Scott C Aker1,2, Kathleen F Faulkner2, Hamish Innes-Brown1,3

  • 1Music and CI Lab, Department of Health Technology, Technical University of Denmark, Kongens Lyngby, Denmark.

The Journal of the Acoustical Society of America
|October 22, 2024
PubMed
Summary

Tactile stimulation on the wrist can alter how loud sounds seem, potentially helping people with hearing loss. This research explores using wrist-based haptic feedback to adjust auditory perception.

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Area of Science:

  • Auditory Perception
  • Haptics
  • Sensory Integration

Background:

  • Tactile stimulation is known to influence auditory loudness perception.
  • This cross-modal interaction may benefit individuals with impaired auditory intensity perception, like cochlear implant (CI) users.
  • The precise application site and bidirectional modulation (amplification/attenuation) of tactile effects on auditory loudness remain unclear.

Purpose of the Study:

  • To investigate if tactile stimulation applied to the wrist can modulate perceived auditory loudness.
  • To determine if tactile stimulation can both amplify and attenuate auditory loudness perception.
  • To assess the feasibility of wrist-based haptic devices for auditory applications.

Main Methods:

  • Two loudness-matching experiments were conducted with human participants.
  • Participants matched auditory comparison stimuli to reference stimuli under varying tactile stimulation conditions.
  • Tactile stimulation, spectro-temporally identical to auditory stimuli, was applied to the wrist.

Main Results:

  • Tactile stimulation applied to the wrist during the comparison stimulus significantly increased perceived auditory loudness.
  • When tactile stimulation was applied incongruently to reference and comparison stimuli, a decrease in perceived auditory loudness was observed.
  • Evidence supports the existence of a tactile loudness bias, demonstrating bidirectional modulation.

Conclusions:

  • Wrist-based tactile stimulation can effectively modulate perceived auditory loudness, both amplifying and attenuating it.
  • These findings support the development of wrist-worn haptic devices to adjust the auditory dynamic range.
  • This research offers a novel approach to enhance auditory perception for individuals with hearing impairments.