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Understanding speech in modulated interference: cochlear implant users and normal-hearing listeners.

Peggy B Nelson1, Su-Hyun Jin, Arlene Earley Carney

  • 1Department of Communication Disorders, University of Minnesota, Minneapolis, Minnesota 55455, USA. nelso477@umn.edu

The Journal of the Acoustical Society of America
|February 25, 2003
PubMed
Summary

Cochlear implant users struggle with modulated noise, unlike normal-hearing listeners who benefit from it. This difficulty persists across different implant devices, suggesting processing limitations.

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Area of Science:

  • Auditory perception
  • Speech processing
  • Cochlear implants

Background:

  • Normal-hearing listeners utilize temporal gaps in fluctuating maskers.
  • Sensorineural hearing loss and cochlear implant (CI) use can impair benefit from modulated maskers.
  • CI processing strategies and limited spectral resolution may negatively impact CI users in noisy environments.

Purpose of the Study:

  • To evaluate sentence recognition in cochlear implant (CI) users with modulated speech-shaped noise.
  • To compare CI users' performance with normal-hearing (NH) listeners.
  • To investigate the effect of masker modulation rates on speech understanding.

Main Methods:

  • Participants included CI users and NH listeners.
  • Speech-in-noise tests used IEEE sentences in quiet, steady noise, and modulated noise maskers.

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  • Maskers were presented at various signal-to-noise ratios (SNRs) and modulation rates (1-32 Hz).

    • Main Results:

    • NH listeners showed significant release from masking, particularly at 8 Hz modulation.
    • CI users exhibited minimal release from masking and potential negative effects at syllabic rates (2-4 Hz).
    • Results were consistent across three different CI devices and processing strategies.

    Conclusions:

    • CI users derive little benefit from modulated maskers compared to NH listeners.
    • The lack of masking release in CI users appears independent of device type.
    • Limitations may stem from CI processing strategies or reduced spectral detail in processed auditory signals.