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Related Experiment Videos

Loudness reduction and adaptation induced by a contralateral tone.

M C Botte, C Baruch, B Scharf

    The Journal of the Acoustical Society of America
    |July 1, 1986
    PubMed
    Summary

    A brief tone in one ear significantly reduces the perceived loudness of a continuous tone in the other ear. This loudness adaptation effect is frequency-dependent and linked to the perceived location of the sound.

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    Area of Science:

    • Auditory Perception
    • Psychoacoustics
    • Human Senses

    Background:

    • Contralateral auditory masking can significantly impact sound perception.
    • Previous research indicated that sounds in one ear can affect loudness perception in the other.

    Purpose of the Study:

    • To investigate the underlying mechanisms of induced loudness adaptation.
    • To quantify the relationship between inducer tone characteristics and loudness reduction.

    Main Methods:

    • Utilized the method of successive magnitude estimations to measure loudness.
    • Varied the duration and frequency of an inducer tone presented to the contralateral ear.
    • Tested tones at 500, 1000, and 3000 Hz, all at 60 dB SPL.

    Main Results:

    • An inducer tone of 5s or longer at the same frequency caused an 80-100% loudness reduction in the test ear.
    • Loudness reduction decreased as inducer frequency deviated from the test tone frequency, with a notable drop beyond the critical bandwidth.
    • The degree of loudness reduction correlated with the perceived shift of the sound image away from the head's center.

    Conclusions:

    • Induced loudness adaptation is a robust phenomenon influenced by inducer frequency and duration.
    • The critical bandwidth plays a role in the extent of this contralateral loudness reduction.
    • Sound image decentralization appears to be a key factor in the observed loudness adaptation.

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