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Maximizing effective audibility in hearing aid fitting.

T Y Ching1, H Dillon, R Katsch

  • 1National Acoustic Laboratories, Chatswood, Australia.

Ear and Hearing
|June 21, 2001
PubMed
Summary
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More audibility is not always better for hearing-impaired individuals. Effective audibility, accounting for hearing loss and distortion, is crucial for optimizing speech intelligibility with hearing aids.

Area of Science:

  • Audiology
  • Speech Science
  • Hearing Science

Background:

  • Speech intelligibility is critical for hearing-impaired individuals.
  • Traditional audibility measures may not fully capture speech perception challenges.
  • Understanding the nuances of audibility is essential for effective hearing aid fitting.

Purpose of the Study:

  • To investigate why increased audibility does not always lead to improved speech understanding for the hearing impaired.
  • To quantify the relationship between audibility and speech intelligibility in individuals with hearing loss.
  • To modify the Speech Intelligibility Index (SII) model to incorporate effective audibility.

Main Methods:

  • Utilized speech perception data from 54 participants (14 normal hearing, 40 hearing impaired).

Related Experiment Videos

  • Quantified the contribution of audibility to speech intelligibility across different frequencies.
  • Modified the SII model to account for effective audibility, considering level distortion and hearing loss desensitization.

    • Main Results:

    • The effectiveness of audibility in speech perception decreases with the severity of hearing loss, particularly at higher frequencies.
    • The modified SII model accurately predicted speech performance across a wide range of hearing thresholds.
    • Demonstrated the importance of considering both loudness and effective audibility in hearing aid prescription.

    Conclusions:

    • Effective audibility, not just physical audibility, is key for optimizing speech intelligibility.
    • Hearing aid prescriptions should prioritize gain in frequencies where audibility is most beneficial.
    • The modified SII and loudness models informed the development of the NAL-NL1 nonlinear hearing aid prescription.