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Vertical and horizontal sound localization in primates

C H Brown, T Schessler, D Moody

    The Journal of the Acoustical Society of America
    |December 1, 1982
    PubMed
    Summary
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    Old World monkeys (Macaca) can determine sound location, but vertical sound localization accuracy depends on high-frequency sounds. Horizontal localization acuity decreases with increasing distance from the midline.

    Area of Science:

    • Auditory Neuroscience
    • Primate Sensory Perception
    • Psychoacoustics

    Background:

    • Understanding sound localization is crucial for auditory neuroscience.
    • Investigating auditory spatial acuity in non-human primates provides insights into the evolution of hearing.

    Purpose of the Study:

    • To psychophysically determine minimum audible angles for sound localization in vertical and horizontal planes in Old World monkeys (Macaca).
    • To assess the influence of signal frequency content and spatial location on auditory localization acuity.

    Main Methods:

    • Psychophysical determination of minimum audible angles (MAA) using primate vocalizations and noise bands for vertical localization.
    • Testing horizontal localization with pure tones at various frequencies and referent locations in the right frontal quadrant.

    Related Experiment Videos

    Main Results:

    • Vertical minimum audible angles ranged from 3 to over 20 degrees, dependent on signal bandwidth and high-frequency content (below 2000 Hz impaired acuity).
    • Horizontal localization acuity decreased as sound sources moved away from the midline, with MAAs ranging from approximately 4 to over 20 degrees.

    Conclusions:

    • Auditory spatial perception in Macaca monkeys is sensitive to frequency content, particularly high frequencies for vertical localization.
    • Horizontal sound localization acuity is azimuth-dependent, decreasing with greater displacement from the midline.