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Brain stem response audiometry at speech frequencies

K Kodera, H Yamane, O Yamada

    Audiology : Official Organ of the International Society of Audiology
    |November 1, 1977
    PubMed
    Summary
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    Auditory-evoked brain stem response (BSR) testing provides objective hearing threshold assessment. This study confirms BSR

    Area of Science:

    • Audiology
    • Neuroscience
    • Hearing Science

    Background:

    • Hearing loss diagnosis relies on subjective and objective measures.
    • Auditory-evoked brain stem response (BSR) offers an objective method to assess auditory pathway function.

    Purpose of the Study:

    • To evaluate the utility of BSR (wave V) for objective hearing threshold assessment at speech frequencies (500, 1000, 2000 Hz).
    • To compare BSR thresholds with conventional pure-tone audiometry in normal and hearing-impaired individuals.

    Main Methods:

    • BSRs were recorded using 5-ms tone pips (no plateau) at 500, 1000, and 2000 Hz.
    • Participants included 10 normal-hearing subjects and 16 subjects with hearing impairment.
    • BSR and pure-tone thresholds were measured and compared across frequency bands.

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    Main Results:

    • In normal subjects, BSR thresholds were 10-20 dB SL.
    • In hearing-impaired subjects, BSR thresholds correlated with pure-tone thresholds for both low and high-frequency losses.
    • BSR thresholds were, on average, 10.9-11.3 dB higher than pure-tone thresholds in impaired ears.

    Conclusions:

    • BSR (wave V) is a valuable tool for the objective assessment of hearing thresholds at critical speech frequencies.
    • The findings support the use of BSR in audiological evaluations, particularly when behavioral responses are unreliable.