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Sound localization under perturbed binaural hearing.

Marc M Van Wanrooij1, A John Van Opstal

  • 1Department of Biophysics, Radboud University Nijmegen, Geert Grooteplein 21, 6525 EZ Nijmegen, The Netherlands.

Journal of Neurophysiology
|October 27, 2006
PubMed
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A monaural ear plug impairs sound localization, forcing reliance on spectral cues for azimuth. Elevation processing also changes, suggesting a weighting of acoustic cues for accurate sound localization.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Auditory Perception

Background:

  • Binaural cues are crucial for sound localization.
  • The role of monaural cues when binaural information is degraded is less understood.

Purpose of the Study:

  • Investigate the acute effects of a monaural plug on human sound localization in both horizontal (azimuth) and vertical (elevation) planes.
  • Determine how listeners adapt to the loss of binaural cues.

Main Methods:

  • Tested sound localization using head-orienting responses to noise bursts.
  • Used high-pass filtered and broadband noises at various sound levels.
  • Interleaved stimuli to prevent consistent head-shadow cues.

Main Results:

Related Experiment Videos

  • A monaural plug immediately degraded azimuth localization, causing a sound level-dependent bias and gain shift.
  • Localization performance was best for low-intensity stimuli on the unoccluded side.
  • Elevation localization was also affected, dependent on azimuth and sound level.

Conclusions:

  • Listeners utilize monaural spectral cues for azimuth localization when binaural cues are absent.
  • Neural computation of elevation involves binaural weighting based on perceived azimuth.
  • Sound localization integrates and weights acoustic cues dynamically based on reliability.