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Acoustic-reflex dynamics for pulsed signals

T L Wiley, R S Karlovich

    Journal of Speech and Hearing Research
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Acoustic reflex measurements reveal that stapedius muscle recovery influences impedance changes over time. Response maxima and minima increase with time, especially for longer duty cycles, offering insights into auditory system dynamics.

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    Area of Science:

    • Audiology
    • Auditory Physiology
    • Acoustic Reflex Research

    Background:

    • The acoustic reflex, mediated by the stapedius muscle, plays a role in auditory protection and sound processing.
    • Understanding the dynamics of the acoustic reflex is crucial for diagnosing hearing disorders and interpreting auditory function.

    Purpose of the Study:

    • To investigate the temporal characteristics of contralateral acoustic-reflex measurements.
    • To examine how acoustic impedance changes during and after pulsed broadband noise activation.
    • To explore the influence of activator period and duty cycle on acoustic reflex dynamics.

    Main Methods:

    • Contralateral acoustic-reflex measurements were performed on 10 normal-hearing subjects.
    • Pulsed broadband noise served as the reflex-activating signal.

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  • Acoustic impedance was measured during response maxima and minima over a 2-minute interval, varying activator period and duty cycle.

    • Main Results:

    • Response maxima showed an increase over time, particularly with longer duty cycles.
    • Response minima also increased over time across all tested duty cycles.
    • These temporal changes suggest a role for stapedius muscle recovery characteristics.

    Conclusions:

    • Stapedius muscle recovery dynamics significantly impact acoustic reflex measurements over time.
    • The observed temporal increases in acoustic impedance provide a basis for understanding temporary threshold shift phenomena.
    • Acoustic reflex dynamics offer valuable insights into the recovery processes of the auditory system.