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Interaural spectral asymmetry and sensitivity to interaural time differences.

Christopher A Brown1, William A Yost

  • 1Psychoacoustics Laboratory, Department of Speech and Hearing Science, Arizona State University, PO Box 870102, Tempe, Arizona 85287-0102, USA. c-b@asu.edu

The Journal of the Acoustical Society of America
|November 18, 2011
PubMed
Summary
This summary is machine-generated.

Listeners can better distinguish interaural time difference (ITD) changes in noise when spectral differences between ears are moderate. Increased monotic bandwidth, despite constant spectral overlap, impaired ITD discrimination.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Interaural time difference (ITD) is crucial for sound localization.
  • Understanding ITD processing with spectral disparities is vital for auditory perception.
  • Previous research often assumes identical spectral content at both ears.

Purpose of the Study:

  • To investigate how spectral differences between ears affect interaural time difference (ITD) discrimination.
  • To determine the impact of varying monotic bandwidth on ITD thresholds in low-frequency noise.

Main Methods:

  • Gaussian noise was bandpass filtered with identical high-pass but different low-pass cutoff frequencies for each ear.
  • An interaural time difference (ITD) was applied to the noise.
  • Listeners' ITD discrimination thresholds were measured as a function of spectral differences (monotic bandwidth).

Main Results:

  • Interaural time difference (ITD) thresholds increased as the bandwidth presented to a single ear (monotic bandwidth) increased.
  • This increase occurred even when the frequency region of spectral overlap between the ears remained constant.
  • Listeners demonstrated the ability to process ITD cues when spectral information at the two ears was moderately different.

Conclusions:

  • Spectral differences between the ears significantly impact interaural time difference (ITD) processing.
  • Increased monotic bandwidth, a form of spectral disparity, degrades ITD sensitivity.
  • The auditory system can effectively utilize ITD information even with moderate spectral mismatches.