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The Power of Interstimulus Interval for the Assessment of Temporal Processing in Rodents
10:27

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Published on: April 19, 2019

Interaural time processing when stimulus bandwidth differs at the two ears.

Christopher A Brown1, William A Yost

  • 1Department of Communication Sciences and Disorders, University of Pittsburgh, Pittsburgh, PA 15260, USA.

Advances in Experimental Medicine and Biology
|May 30, 2013
PubMed
Summary
This summary is machine-generated.

Cochlear implant patients with residual hearing can process interaural time differences (ITDs), but conflicting spectral information across ears hinders sound localization. This impacts spatial hearing for many.

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Area of Science:

  • Auditory Neuroscience
  • Audiology
  • Speech and Hearing Sciences

Background:

  • Cochlear implants (CIs) increasingly preserve residual low-frequency hearing.
  • Bilateral hearing and asymmetrical audiograms are common in CI users.
  • Interaural time differences (ITDs) are crucial for sound localization and spatial release from masking.

Purpose of the Study:

  • To investigate interaural time difference (ITD) processing in the presence of interaural spectral differences.
  • To simulate conditions relevant to cochlear implant users with bilateral residual hearing.
  • To understand how spectral disparities affect the ability to use ITDs for spatial hearing.

Main Methods:

  • ITD sensitivity was measured using noise bands with varying spectral content between ears.
  • One ear received a fixed noise band, while the other had a spectrally shifted band.
  • The experiment expanded on prior work varying stimulus bandwidths between ears.

Main Results:

  • Listeners struggled to utilize ITDs when spectral information was inconsistent across ears.
  • Conflicting spatial cues in different spectral regions impaired ITD sensitivity.
  • This suggests difficulties in sound localization for CI users with bilateral residual hearing.

Conclusions:

  • CI users with bilateral residual hearing may face challenges with spatial hearing due to interaural spectral differences.
  • Auditory system's ability to attend to ITDs is compromised by conflicting spectral cues.
  • Findings have implications for optimizing auditory rehabilitation strategies for CI recipients.