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Related Experiment Videos

Minimum audible angle thresholds for sources varying in both elevation and azimuth.

D R Perrott1, K Saberi

  • 1Psychoacoustics Laboratory, California State University, Los Angeles 90032.

The Journal of the Acoustical Society of America
|April 1, 1990
PubMed
Summary

The minimum audible angle (MAA) for sound source localization is smallest when sources are horizontal, but degrades significantly as the array approaches vertical orientation. This impacts auditory spatial resolution.

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Spatial Hearing

Background:

  • Auditory localization is crucial for understanding the environment.
  • Minimum Audible Angle (MAA) quantifies the smallest detectable separation between sound sources.
  • Previous research established MAA thresholds under various conditions.

Purpose of the Study:

  • To investigate how the orientation of a sound source array affects MAA thresholds.
  • To determine the impact of horizontal, vertical, and oblique source distributions on auditory spatial resolution.
  • To relate findings to natural listening conditions and head movements.

Main Methods:

  • Four subjects participated in a two-alternative, forced-choice, adaptive psychophysical procedure.
  • MAA thresholds were measured with sound sources arranged in horizontal, vertical, and oblique planes.

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  • The orientation of the source array was systematically varied.

    • Main Results:

    • Mean MAA threshold was lowest (0.97 degrees) for sources on the horizontal plane.
    • MAA threshold increased significantly (3.65 degrees) for sources on the vertical plane.
    • Thresholds remained relatively stable (0.78-1.06 degrees) for oblique arrays (10-60 degrees from horizontal), but increased to 1.8 degrees near vertical (80 degrees).

    Conclusions:

    • Auditory spatial resolution is highly dependent on the orientation of the sound source array.
    • Horizontal arrangements provide the best spatial acuity, while vertical arrangements significantly impair it.
    • These findings have implications for understanding auditory localization in dynamic, natural environments.