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Related Experiment Videos

Posttransient shifts in auditory lateralization.

Yoav Arieh1, Lawrence E Marks

  • 1Department of Psychology, Montclair State University, Montclair, New Jersey 07043, USA. ariehy@mail.montclair.edu

Perception & Psychophysics
|August 31, 2007
PubMed
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Intense sounds presented to one ear reduce loudness perception and affect sound localization. This suggests a peripheral reduction in auditory intensity processing near the inducer frequency.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Brief, intense sounds (inducers) reduce the perceived loudness of subsequent signals.
  • The effect of such inducers on sound lateralization, or perceived horizontal position, is not well understood.

Purpose of the Study:

  • To investigate if auditory inducers affect sound lateralization judgments.
  • To determine if the frequency relationship between inducer and target influences this effect.

Main Methods:

  • Two experiments were conducted using auditory stimuli.
  • Participants judged the lateral position of target tones after exposure to a brief inducer tone in one ear.
  • Experiment 1 used inducers and targets of the same frequency; Experiment 2 used different frequencies within separate critical bands.

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Main Results:

  • When inducers and targets shared the same frequency, participants were less likely to lateralize the target sound towards the exposed ear.
  • When inducers and targets had different frequencies (outside the same critical band), this effect on lateralization was eliminated.
  • Loudness reduction and lateralization effects were linked to the inducer's frequency region.

Conclusions:

  • Auditory inducers temporarily reduce the processing of intensity information in a specific frequency range.
  • This reduction in intensity representation appears to occur peripherally, before binaural intensity differences are encoded.
  • The findings suggest a general mechanism for intensity information reduction in hearing, impacting both loudness and lateralization.