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Onset dominance in lateralization

R L Freyman1, P M Zurek, U Balakrishnan

  • 1Department of Communication Disorders, University of Massachusetts, Amherst 01003, USA.

The Journal of the Acoustical Society of America
|March 1, 1997
PubMed
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The initial sound delay (interaural onset delay) guides sound localization in the brain, especially when ongoing sound cues are weak or ambiguous. This onset dominance can be disrupted by sudden changes, with individual hearing differences noted.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Previous research demonstrated that the initial interaural delay of a pulse train influences perceived sound location.
  • The binaural auditory system uses interaural time differences (ITDs) to localize sounds.

Purpose of the Study:

  • To investigate the conditions under which sound lateralization is primarily determined by interaural onset delay.
  • To explore the role of stimulus periodicity and interaural delay ambiguity in onset dominance.

Main Methods:

  • Utilized wideband pulse trains, noise-burst trains, and inharmonic complexes (250 ms duration).
  • Manipulated interaural delays and correlations of specific temporal segments.
  • Employed an acoustic pointer measure for assessing sound lateralization.

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Main Results:

  • Interaural onset delay controlled lateralization when steady-state binaural cues were weak (sparse spectral components or ambiguous ITDs).
  • Sudden changes within the stimulus train could disrupt onset dominance.
  • Observed significant individual differences in the effectiveness of onset cues.

Conclusions:

  • Onset ITDs are crucial for sound localization, particularly under conditions of weak ongoing binaural information.
  • The findings contribute to understanding the interplay between onset and ongoing ITDs in auditory spatial perception.
  • Individual asymmetries in onset cue processing were identified.