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Speech-derived haptic stimulation enhances speech recognition in a multi-talker background.

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Adding vibrotactile stimulation, derived from speech temporal envelopes, significantly improved speech-in-noise (SiN) recognition by 0.41 dB in normal-hearing listeners. This audio-tactile benefit was greater for individuals with poorer SiN performance and higher tactile sensitivity.

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Area of Science:

  • Auditory Neuroscience
  • Haptics and Human-Computer Interaction
  • Speech Perception Research

Background:

  • Speech-in-noise (SiN) intelligibility is significantly impaired in noisy environments, posing challenges for effective communication.
  • Previous research suggests that supplementing auditory speech signals with haptic input can enhance SiN perception.
  • The temporal envelope of speech carries crucial information for intelligibility, making it a viable signal for haptic translation.

Purpose of the Study:

  • To investigate if vibrotactile signals from speech temporal envelopes improve SiN intelligibility in multi-talker noise for untrained, normal-hearing listeners.
  • To determine if vibrotactile sensitivity, measured by detection thresholds, influences the degree of audio-tactile SiN improvement.
  • To explore the potential of tactile speech aid devices.

Main Methods:

  • Participants' speech recognition was measured in multi-talker noise under audio-only and audio-tactile conditions.
  • Vibrotactile stimulation, derived from the speech temporal envelope, was delivered to the palm (left, right, or both).
  • Vibrotactile detection thresholds were assessed to evaluate tactile sensitivity.

Main Results:

  • Concurrent vibrotactile stimulation resulted in a significant 0.41 dB improvement in SiN recognition compared to the audio-only condition, averaged across stimulation schemes.
  • No significant differences in improvement were found between the three vibrotactile delivery schemes (left palm, right palm, or both).
  • The audio-tactile SiN benefit was significantly predicted by participants' vibrotactile threshold levels and their baseline audio-only SiN performance.

Conclusions:

  • Concurrent vibrotactile stimulation, derived from speech temporal envelopes, offers a viable method to enhance SiN recognition, particularly for individuals with poorer auditory perception.
  • The degree of improvement appears to be modulated by tactile sensitivity, suggesting potential benefits for specific user groups.
  • These findings support multimodal theories of speech perception and the development of tactile speech aid technologies.