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Related Experiment Videos

Temporal summation in acoustic reflex growth functions

S A Gelfand, S Silman, C A Silverman

    Acta Oto-Laryngologica
    |March 1, 1981
    PubMed
    Summary

    Acoustic reflex thresholds and magnitudes depend on activator duration. Shorter durations (20-200 msec) yield higher thresholds and smaller reflex magnitudes compared to longer durations (1000 msec).

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    Area of Science:

    • Audiology
    • Auditory Neuroscience
    • Otoacoustic Emissions

    Background:

    • The acoustic reflex is a protective mechanism that contracts the stapedius muscle in response to loud sounds.
    • Understanding acoustic reflex growth functions is crucial for diagnosing auditory pathway disorders.
    • Activator duration is a critical parameter influencing acoustic reflex responses.

    Purpose of the Study:

    • To investigate the effect of different activator durations (20, 200, 1000 msec) on acoustic reflex growth functions.
    • To compare reflex thresholds and magnitudes across various pure tone frequencies (500, 1000, 2000 Hz) and broad-band noise (BBN).
    • To analyze the impact of temporal summation on normalized reflex magnitude growth.

    Main Methods:

    • Acoustic reflex growth functions were measured in four young, normal-hearing subjects.
    • Pure tone activators (500, 1000, 2000 Hz) and broad-band noise (BBN) were used.
    • Activator durations of 20, 200, and 1000 msec with 10 msec rise/decay times were employed.

    Main Results:

    • Lowest reflex thresholds were observed for 1000 msec activators, followed by 200 msec, and then 20 msec.
    • Shorter activator durations resulted in lower reflex magnitudes.
    • Normalized reflex magnitude growth varied with frequency and duration, showing slower growth with decreasing duration at 1000 and 2000 Hz.

    Conclusions:

    • Activator duration significantly influences acoustic reflex thresholds and growth functions.
    • Temporal summation plays a role in reflex magnitude, particularly at longer durations and higher frequencies.
    • Findings suggest that duration-dependent changes in acoustic reflexes may be relevant for clinical audiological assessments.

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