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Related Experiment Videos

Speech Rate Normalization and Phonemic Boundary Perception in Cochlear-Implant Users.

Brittany N Jaekel1, Rochelle S Newman1, Matthew J Goupell1

  • 1Department of Hearing and Speech Sciences, University of Maryland, College Park.

Journal of Speech, Language, and Hearing Research : JSLHR
|April 11, 2017
PubMed
Summary

Adults with cochlear implants (CI) can adjust speech perception based on speech rate, demonstrating a larger rate normalization effect than normal-hearing (NH) individuals. This suggests CIs do not impede this crucial auditory processing ability.

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Area of Science:

  • Auditory Neuroscience
  • Speech Perception
  • Prosthetic Hearing

Background:

  • Normal-hearing listeners adjust speech perception to variations in speech rate through rate normalization.
  • Cochlear implants (CI) provide degraded auditory signals, raising questions about their users' ability to perform rate normalization.
  • Variability in speech perception among CI users may stem from difficulties in adapting to speech rate changes.

Purpose of the Study:

  • To investigate whether adults with cochlear implants (CI) can perform rate normalization.
  • To compare the rate normalization abilities of CI users with normal-hearing (NH) individuals.

Main Methods:

  • Phoneme identification tasks were conducted using stimuli with manipulated voice-onset-time (VOT) embedded in sentences of varying speech rates.

Related Experiment Videos

  • Participants included 23 CI users and 29 NH listeners.
  • NH listeners were tested with both unprocessed and vocoded (simulating CI degradation) stimuli.

    • Main Results:

    • CI users exhibited a larger rate normalization effect (6.6 ms) compared to NH users (3.7 ms).
    • CI users and NH users with vocoded stimuli showed shallower category boundary slopes, indicating less reliable perception.
    • NH users with degraded signals showed reduced rate normalization effects.

    Conclusions:

    • Adults with cochlear implants can perform rate normalization, even with degraded speech signals.
    • CI users demonstrate a greater reliance on rate normalization for speech perception compared to NH individuals.
    • Rate normalization may be a key mechanism for CI users to maintain perceptual constancy of speech.