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Two-dimensional sound localization by human listeners.

J C Makous1, J C Middlebrooks

  • 1Department of Neuroscience, University of Florida, Gainesville 32610.

The Journal of the Acoustical Society of America
|May 1, 1990
PubMed
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This study investigated sound localization accuracy in humans using head orientation. Results show precise localization for sounds in front, with errors increasing for peripheral locations, highlighting the effectiveness of head orientation techniques.

Area of Science:

  • Auditory Neuroscience
  • Human Perception
  • Acoustic Signal Processing

Background:

  • Accurate sound localization is crucial for auditory scene analysis and spatial awareness.
  • Understanding the mechanisms of auditory spatial perception informs research in human-computer interaction and assistive technologies.

Purpose of the Study:

  • To quantify human ability to localize broadband sound sources in three-dimensional space.
  • To assess the accuracy of head orientation as a method for measuring sound localization performance.
  • To investigate the influence of stimulus location on localization precision.

Main Methods:

  • Subjects localized brief (150 ms) and continuous broadband sounds in a free field.
  • Head orientation was measured electromagnetically to record responses.

Related Experiment Videos

  • Localization errors were analyzed across horizontal and vertical dimensions for various stimulus positions.

    • Main Results:

    • Excellent localization performance for sounds in front (mean errors ~2° horizontal, ~3.5° vertical).
    • Localization errors increased with peripheral stimulus locations, reaching up to ~20°.
    • Horizontal localization was more accurate near the frontal midline, while vertical accuracy improved in peripheral locations.
    • Front/back confusions occurred in 6% of trials, suggesting reliance on interaural difference cues.

    Conclusions:

    • The head orientation technique provides a reliable measure of sound localization capabilities.
    • Human sound localization is highly accurate for frontal stimuli but degrades with eccentricity.
    • Auditory spatial perception involves complex processing of acoustic cues, including interaural differences.