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Binaural interference and auditory grouping.

Virginia Best1, Frederick J Gallun, Simon Carlile

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

The Journal of the Acoustical Society of America
|March 14, 2007
PubMed
Summary
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Sequential grouping cues influence binaural interference, affecting auditory perception. Capturing a low-frequency interferer in a stream of tones restored perceived lateral positions of a high-frequency target.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Perceptual Psychology

Background:

  • Binaural interference disrupts high-frequency target judgments with low-frequency interferers.
  • Previous studies linked interference strength to simultaneous auditory grouping cues like harmonicity and onset synchrony.

Purpose of the Study:

  • To investigate the role of sequential grouping cues in binaural interference.
  • To determine if auditory stream segregation influences binaural interference.

Main Methods:

  • Subjects reported the perceived lateral position of a high-frequency sinusoidally amplitude-modulated (SAM) tone with an interaural time difference.
  • A simultaneous diotic low-frequency SAM tone served as an interferer.
  • The interferer was manipulated to be either simultaneous or "captured" in a sequential stream.

Related Experiment Videos

Main Results:

  • Binaural interference reduced perceived lateral positions of the target tone.
  • Capturing the low-frequency interferer in a sequential stream largely restored the perceived lateral positions.
  • A control condition ruled out peripheral adaptation as the cause.

Conclusions:

  • Sequential auditory grouping and stream segregation significantly influence binaural interference.
  • Findings support the role of perceptual organization in auditory processing.
  • Existing models of binaural interference may require modifications to incorporate sequential grouping effects.