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Breakdown of echo suppression in the precedence effect.

R K Clifton1

  • 1Department of Psychology, University of Massachusetts, Amherst 01003.

The Journal of the Acoustical Society of America
|November 1, 1987
PubMed
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Spatial location changes disrupt echo suppression in the precedence effect. Listeners heard sounds from both speakers briefly when the leading sound source switched locations.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Acoustic spatial processing

Background:

  • The precedence effect normally suppresses echoes, ensuring a single perceived sound source.
  • This effect relies on the temporal and spatial cues of the leading sound.
  • Disruptions to these cues can alter auditory localization and echo perception.

Purpose of the Study:

  • To investigate how spatial location changes of a leading sound source affect echo suppression within the precedence effect.
  • To quantify the duration and characteristics of disrupted echo suppression.

Main Methods:

  • Presenting click trains through two loudspeakers with a controlled inter-channel delay (milliseconds).
  • Experimentally switching the spatial location of the leading sound source during the presentation.

Related Experiment Videos

  • Measuring listener perception of sound source location and echo suppression.

    • Main Results:

    • A novel phenomenon was observed where spatial location shifts disrupt normal echo suppression.
    • Listeners momentarily perceived sound emanating from both loudspeakers simultaneously.
    • This disruption persisted for several seconds before echo suppression was reestablished.

    Conclusions:

    • Spatial location is a critical cue for the normal functioning of the precedence effect.
    • Dynamic changes in sound source location can temporarily override established echo suppression mechanisms.
    • This finding has implications for understanding auditory scene analysis and spatial hearing.