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The acoustic reflex threshold in aging ears.

C A Silverman, S Silman, M H Miller

    The Journal of the Acoustical Society of America
    |January 1, 1983
    PubMed
    Summary
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    Age impacts acoustic reflex thresholds for broadband noise, but not for tonal activators. This effect was more pronounced under the 1-dB measurement condition, influencing broadband noise results.

    Area of Science:

    • Audiology
    • Auditory Physiology

    Background:

    • The influence of age on acoustic reflex thresholds is a subject of ongoing debate in audiology.
    • Previous research by Jerger et al. and Silman et al. presented conflicting findings regarding age-related changes in acoustic reflex thresholds.

    Purpose of the Study:

    • To investigate the controversy surrounding the effect of age on acoustic reflex thresholds.
    • To evaluate acoustic reflex thresholds using broadband noise (BBN) and tonal activators (500, 1000, 2000, 4000 Hz) under two distinct measurement conditions (1-dB and 5-dB).

    Main Methods:

    • Seventy-two subjects with normal hearing, aged 20-69 years, participated in the study.
    • Acoustic reflex thresholds were measured using BBN and pure-tone activators.
    • Measurements were conducted under two intensity conditions: 1-dB and 5-dB sensation levels.

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    Main Results:

    • A significant correlation was found between age and acoustic reflex thresholds for the BBN activator.
    • No significant correlation was observed between age and acoustic reflex thresholds for any of the tonal activators.
    • The age-correlation for BBN was stronger under the 1-dB measurement condition compared to the 5-dB condition.

    Conclusions:

    • Age influences acoustic reflex thresholds specifically for broadband noise, not for pure tones.
    • The measurement condition (1-dB vs. 5-dB) affects the observed relationship between age and acoustic reflex thresholds for BBN.
    • Findings contribute to resolving the controversy regarding age effects on acoustic reflexes.