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Sound localization with a preceding distractor.

Norbert Kopco1, Virginia Best, Barbara G Shinn-Cunningham

  • 1Hearing Research Center, Boston University, Boston, Massachusetts 02215, USA.

The Journal of the Acoustical Society of America
|February 15, 2007
PubMed
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A preceding sound distractor influences sound localization, even at long intervals. This contextual bias adapts dynamically to the environment and persists over minutes, affecting auditory perception.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Perception

Background:

  • Sound localization is crucial for spatial awareness.
  • Environmental acoustics, like reverberation, can affect auditory perception.
  • The influence of preceding sounds on localization is not fully understood.

Purpose of the Study:

  • To investigate how a distractor sound from a known location affects subsequent sound localization.
  • To compare these effects in different acoustic environments (classroom vs. anechoic chamber).
  • To determine the time course of contextual bias in sound localization.

Main Methods:

  • Participants localized a target sound after a distractor sound with varying stimulus onset asynchrony (SOA).
  • Distractor locations were fixed (frontal or lateral) within experimental runs.

Related Experiment Videos

  • Experiments were conducted in both a reverberant classroom and an anechoic chamber.

    • Main Results:

    • Distractors significantly biased and increased variability in sound localization, even at SOAs up to 400 ms.
    • A contextual bias, displacing localization away from the distractor, emerged and persisted over minutes within each run.
    • The pattern of bias and variability differed between the classroom and anechoic chamber, highlighting environmental effects.

    Conclusions:

    • Sound localization is a dynamic process influenced by environmental context and reverberation.
    • Auditory system exhibits adaptation to sequential sound sources across multiple timescales (milliseconds to minutes).
    • Understanding these influences is key to explaining real-world auditory spatial perception.