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Related Experiment Videos

Loudness and the acoustic reflex: normal-hearing listeners.

R W Keith

    Journal of the American Audiology Society
    |January 1, 1979
    PubMed
    Summary

    This study explored loudness perception in normal-hearing individuals. Results show the most comfortable listening level (MCL) is affected by noise, unlike the acoustic reflex (AR).

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    Area of Science:

    • Audiology
    • Psychoacoustics
    • Hearing Science

    Background:

    • Understanding loudness perception is crucial for audiological rehabilitation.
    • The acoustic reflex (AR) serves as a protective mechanism against loud sounds.
    • Relationships between auditory thresholds and loudness perception require further investigation.

    Purpose of the Study:

    • To investigate the interplay between most comfortable listening level (MCL), loudness discomfort level (LDL), and the acoustic reflex (AR) to speech.
    • To examine these relationships under both earphone and sound field conditions.
    • To assess the impact of background noise on these auditory parameters.

    Main Methods:

    • Normal-hearing listeners participated in the study.
    • Stimuli included recorded sentences presented monaurally.
    • Testing was conducted in quiet and with cafeteria noise (55 dB SPL) using earphones and a sound field setup.

    Main Results:

    • The MCL in a quiet sound field was approximately 70 dB SPL, with the AR occurring 16 dB higher.
    • Earphone MCL was 7 dB lower than sound field MCL, possibly due to calibration.
    • The AR to speech occurred at intensities between MCL and LDL in quiet.
    • Noise elevated MCL, but AR remained constant, indicating no absolute loudness-AR relationship.

    Conclusions:

    • The most comfortable listening level (MCL) is influenced by background noise.
    • The acoustic reflex (AR) demonstrates independence from loudness perception changes.
    • No fixed relationship exists between perceived loudness and the acoustic reflex intensity.

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