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Auditory localization in a free field using discrimination procedures.

L F Elfner1, W R Howse

  • 1Department of Psychology, Florida State University, Tallahassee 32306.

The Journal of Auditory Research
|January 1, 1987
PubMed
Summary
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This study investigated sound localization by measuring the minimum discriminable angle (MDA) for auditory targets. Results show that sound localization accuracy, or MDA, is best directly in front and degrades in rear quadrants.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Human spatial orientation

Background:

  • Accurate sound localization is crucial for environmental awareness and interaction.
  • Previous research established minimum audible angles (MAA) under various conditions.
  • The impact of masking noise and specific testing paradigms on spatial discrimination requires further investigation.

Purpose of the Study:

  • To determine the minimum discriminable angle (MDA) for sound source azimuth.
  • To evaluate the effect of masking noise on auditory spatial resolution.
  • To compare MDA results with existing literature on minimum audible angles (MAA).

Main Methods:

  • Participants (N=3) were presented with 750-ms bursts of pink noise at 54 dB SPL in an anechoic chamber.

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  • A loudspeaker moved in clockwise or counterclockwise directions during a masking noise (73 dB SPL).
  • Participants judged if the sound source azimuth changed, with MDA calculated at a 70% correct rate.

    • Main Results:

    • Minimum discriminable angles (MDAs) were smallest at 0 degrees azimuth (approx. 4.5 degrees) and largest in the rear quadrants.
    • Localization performance was relatively good at 180 degrees azimuth (approx. 8.5 degrees).
    • One participant demonstrated exceptional performance with a low false alarm rate.

    Conclusions:

    • Auditory spatial discrimination is generally poorer in the rear hemifield compared to the front.
    • The presence of masking noise and specific experimental design may contribute to larger MDAs than previously reported MAAs.
    • The study did not replicate findings of a large determination at 90 degrees azimuth reported by Mills (1958).