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Related Experiment Videos

Acoustic-reflex growth and loudness.

M G Block, T L Wiley

    Journal of Speech and Hearing Research
    |June 1, 1979
    PubMed
    Summary

    This study investigated how acoustic reflex changes relate to perceived loudness in normal-hearing individuals. Findings indicate that equal acoustic impedance changes, measured via acoustic reflex, correspond to equal loudness judgments, supporting the loudness-balance hypothesis.

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    Area of Science:

    • Audiology
    • Psychoacoustics
    • Auditory Physiology

    Background:

    • The acoustic reflex is a physiological response to loud sound.
    • Understanding the relationship between acoustic reflex magnitude and perceived loudness is crucial for audiological assessments.

    Purpose of the Study:

    • To evaluate the hypothesis that equal acoustic impedance changes, elicited by acoustic reflex-activating signals, are perceived as equal in loudness.
    • To investigate the dynamic range of acoustic reflex growth in normal-hearing listeners.

    Main Methods:

    • Acoustic-reflex growth functions and loudness-balance judgments were measured in three normal-hearing subjects.
    • Acoustic impedance changes were recorded in response to varying sound pressure levels (SPL) of broadband noise and a 1000-Hz tone.
    • Loudness balance was assessed at 30%, 50%, and 70% of each subject's dynamic reflex range.

    Main Results:

    • The study defined a criterion acoustic-reflex response based on a significant change in acoustic impedance.
    • Acoustic impedance was measured across the dynamic range of reflex growth for different sound stimuli.
    • Loudness-balance judgments aligned with the acoustic impedance changes, supporting the study's hypothesis.

    Conclusions:

    • The findings support the hypothesis that proportionately equal acoustic impedance changes, as measured by the acoustic reflex, are perceived as equal in loudness.
    • This suggests a direct link between the physiological acoustic reflex response and subjective loudness perception in normal hearing.

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