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Related Experiment Videos

Minimum audible movement angles as a function of sound source trajectory.

K Saberi1, D R Perrott

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

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

Auditory resolution for moving sounds is best for horizontal or oblique paths, with vertical motion significantly impairing minimum audible movement angles (MAMA). Optimal hearing occurs at specific velocities depending on sound source direction.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Human spatial hearing

Background:

  • Understanding how humans perceive the movement of sound sources is crucial for applications like virtual reality and robotics.
  • Previous research has explored minimum audible angles (MAMA) for static sound sources, but less is known about auditory resolution for moving sources.

Purpose of the Study:

  • To determine the auditory resolution of moving sound sources in the frontal plane.
  • To investigate how different motion orientations (horizontal, vertical, oblique) and velocities affect MAMA.
  • To identify optimal velocities for sound source motion detection.

Main Methods:

  • Subjects listened to simulated moving sound sources in a controlled environment.
  • Sound sources moved along horizontal, vertical, and oblique paths at various velocities.

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  • Minimum audible movement angles (MAMA) were measured to quantify auditory resolution.

    • Main Results:

    • MAMA were smallest for horizontal and oblique (45 degrees) motion, indicating better auditory resolution.
    • Vertical motion resulted in significantly larger MAMAs across all tested velocities.
    • Auditory resolution followed a U-shaped function of velocity, with optimal detection at approximately 2 degrees/s for horizontal/oblique and 7-11 degrees/s for vertical motion.
    • Even small deviations from vertical motion (e.g., 10 degrees) substantially improved MAMA.

    Conclusions:

    • Auditory resolution of moving sound sources is highly dependent on the direction of motion.
    • Horizontal and near-horizontal movements are resolved with greater accuracy than vertical movements.
    • The findings provide valuable data for understanding spatial hearing capabilities and designing auditory displays.