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Effects of subtle mid-frequency auditory dysfunction upon speech discrimination in noise

R C Findlay, L J Denenberg

    Audiology : Official Organ of the International Society of Audiology
    |May 1, 1977
    PubMed
    Summary

    Mid-frequency auditory dysfunction does not explain speech-in-noise difficulties in noise-exposed individuals. Older adults with high-frequency hearing loss show greater speech discrimination deficits than predicted by hearing loss alone.

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    Area of Science:

    • Audiology
    • Speech Perception
    • Hearing Science

    Background:

    • Noise exposure can lead to high-frequency hearing loss and difficulties with speech discrimination in noise.
    • Previous research suggests potential mid-frequency auditory dysfunction in noise-exposed individuals.

    Purpose of the Study:

    • To investigate if mid-frequency auditory dysfunction contributes to impaired speech-in-noise discrimination in noise-exposed listeners.
    • To compare speech-in-noise perception in noise-exposed, older, and normal-hearing listeners.

    Main Methods:

    • Participants included normal listeners, noise-exposed listeners, and older listeners with high-frequency hearing loss.
    • Speech discrimination in competing noise was tested under unfiltered and low-pass filtered conditions.
    • Performance was evaluated using word lists in a 'cocktail party' noise setting.

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    Main Results:

    • Noise-exposed listeners outperformed normal listeners in the low-pass filter condition, suggesting mid-frequency dysfunction is not the cause of their difficulties.
    • Older listeners demonstrated poorer speech discrimination than both normal and noise-exposed groups in both conditions.
    • Older listeners' deficits exceeded predictions based solely on their high-frequency hearing loss.

    Conclusions:

    • Mid-frequency auditory dysfunction does not appear to be the primary cause of speech-in-noise deficits in noise-exposed individuals.
    • Older adults experience greater speech-in-noise perception challenges than expected from high-frequency hearing loss alone.
    • Age-related changes may significantly impact auditory processing beyond high-frequency sensitivity loss.