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Stapedius reflex decay in normal hearing subjects.

U Rosenhall, G Lidén, E Nilsson

    Journal of the American Audiology Society
    |January 1, 1979
    PubMed
    Summary
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    Stapedius reflex fatigue was studied in 100 normal ears. Most ears showed no significant reflex decay, with minimal decay observed occasionally, rarely reaching pathological levels.

    Area of Science:

    • Audiology
    • Neurophysiology

    Background:

    • The stapedius reflex is a crucial auditory reflex protecting the inner ear.
    • Understanding stapedius reflex fatigue is important for diagnosing auditory dysfunction.

    Purpose of the Study:

    • To investigate the fatigue characteristics of the stapedius reflex in normal human ears.
    • To determine the prevalence and influencing factors of stapedius reflex decay.

    Main Methods:

    • 100 normal ears were tested using 500 Hz and 1000 Hz stimulus frequencies.
    • Stapedius reflex decrement was measured at 5, 10, and 15 dB above reflex threshold.
    • Variations in stimulus intensity and registration methods were considered.

    Main Results:

    • A majority of ears exhibited no significant reflex decay (less than 10% decay at 10 dB above threshold).

    Related Experiment Videos

  • Reflex decay was observed in 27-58% of ears, influenced by stimulus frequency, intensity, and measurement technique.
  • Decay was more frequent at 1000 Hz than 500 Hz and at 5 dB above threshold compared to higher intensities.

    • Conclusions:

    • Stapedius reflex fatigue in normal ears is generally minimal.
    • Observed reflex decay rarely reached pathological values, suggesting robust reflex function in most individuals.
    • Factors like stimulus frequency and intensity can influence the degree of reflex decay.