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Speech recognition performance at loudness discomfort level

D D Dirks, C A Kamm, J R Dubno

    Scandinavian Audiology
    |January 1, 1981
    PubMed
    Summary
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    For sensorineural hearing loss patients, loudness discomfort levels (LDL) indicate that speech recognition performance does not improve above a certain sound level. This suggests LDL can guide hearing aid saturation sound pressure level settings.

    Area of Science:

    • Audiology
    • Speech-Language Pathology
    • Hearing Science

    Background:

    • Sensorineural hearing loss (SNHL) affects sound perception and can lead to reduced speech understanding.
    • Determining appropriate amplification levels is crucial for optimizing hearing aid effectiveness.
    • Loudness discomfort level (LDL) is a key audiological measure related to sound tolerance.

    Purpose of the Study:

    • To investigate the relationship between loudness discomfort level (LDL) and maximum speech recognition performance in individuals with SNHL.
    • To assess if LDL can serve as a predictor for optimal hearing aid amplification settings.

    Main Methods:

    • Performance-intensity functions were measured for 30 participants with mild to moderate SNHL.
    • Speech recognition was evaluated at five different speech levels relative to each participant's LDL (-18 to +4 dB re: LDL).

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  • Three distinct speech materials were used to assess recognition across various auditory conditions.

    • Main Results:

    • Speech recognition scores were consistently equivalent to or higher at sound levels below the LDL compared to levels at or above the LDL.
    • This pattern held true across all three speech materials tested.
    • No significant improvement in speech recognition was observed at sound levels exceeding the LDL.

    Conclusions:

    • The loudness discomfort level (LDL) appears to represent a critical threshold beyond which speech recognition performance does not increase.
    • LDL is a valuable metric that can inform the setting of saturation sound pressure level (SSPL) for hearing aids.
    • Utilizing LDL for hearing aid fitting may enhance audibility and speech intelligibility for individuals with SNHL.