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Related Experiment Videos

Acoustic-reflex thresholds for noise stimuli

R H Margolis, J R Dubno, R H Wilson

    The Journal of the Acoustical Society of America
    |September 1, 1980
    PubMed
    Summary

    The acoustic reflex threshold is primarily influenced by noise bandwidth between 700 and 6000 Hz. Frequencies below 700 Hz have minimal impact on reflex sensitivity in normal-hearing adults.

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    Response to Cruz.

    American journal of audiology·2015

    Area of Science:

    • Audiology
    • Auditory Neuroscience

    Background:

    • The acoustic reflex is a protective mechanism that dampens loud sounds.
    • Understanding the acoustic reflex threshold's sensitivity to noise bandwidth is crucial for audiological assessments.

    Purpose of the Study:

    • To investigate how varying noise bandwidth affects the acoustic reflex threshold.
    • To determine which frequency ranges of noise are most influential on the acoustic reflex.

    Main Methods:

    • 12 normal-hearing adult subjects participated.
    • Computer-generated low-pass and high-pass noises were used.
    • Cutoff frequencies of noise stimuli were systematically varied.

    Main Results:

    • A 4 dB/octave change in reflex threshold was observed when adjusting cutoff frequencies between 700-6000 Hz.
    • Reducing low-pass noise below 700 Hz significantly increased reflex thresholds.
    • High-pass noise changes above 700 Hz had minimal effect on reflex thresholds.

    Conclusions:

    • Spectral regions between 700 and 6000 Hz contribute equally to the acoustic reflex threshold.
    • Noise energy below 700 Hz has a negligible effect on acoustic reflex sensitivity.

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