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Dynamic auditory localization: systematic replication of the auditory velocity function.

D R Perrott, V Buck, W Waugh

    The Journal of Auditory Research
    |October 1, 1979
    PubMed
    Summary
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    Normal-hearing adults can accurately judge the speed of unseen moving sound sources. Auditory velocity discrimination follows a power function, indicating a reliable aspect of spatial hearing.

    Area of Science:

    • Auditory perception
    • Psychoacoustics
    • Spatial hearing

    Background:

    • Investigating the human ability to perceive the velocity of sound sources is crucial for understanding spatial auditory processing.
    • Previous research suggested auditory velocity discrimination might follow a power function.

    Purpose of the Study:

    • To examine normal-hearing adults' ability to judge the apparent velocity of unseen moving sound sources.
    • To determine if perceived velocity is proportional to actual source velocity.
    • To characterize auditory velocity discrimination using a power function model.

    Main Methods:

    • Two experiments were conducted using normal-hearing adults.
    • Participants judged the velocity of a moving sound source (tone or filtered noise) presented at 50 dB SPL.

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  • In a second experiment, participants adjusted source velocity to achieve a target perceived velocity.

    • Main Results:

    • Perceived sound source velocity was directly proportional to the actual velocity in both experiments.
    • Auditory velocity discrimination was described by a power function with an exponent of 1.0.
    • The Weber fraction for velocity discrimination at 100 degrees/sec was 0.052.

    Conclusions:

    • Auditory velocity discrimination is a well-defined capability of the dynamic binaural spatial system.
    • The results support a power function model for auditory velocity perception.
    • The findings have implications for understanding how humans navigate and interact with dynamic auditory environments.