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Interaural Time Difference Perception with a Cochlear Implant and a Normal Ear.

Tom Francart1, Konstantin Wiebe2, Thomas Wesarg2

  • 1Department Neurosciences, ExpORL, KU Leuven, Herestraat 49 bus 721, 3000, Leuven, Belgium. tom.francart@med.kuleuven.be.

Journal of the Association for Research in Otolaryngology : JARO
|September 29, 2018
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Summary
This summary is machine-generated.

Cochlear implant (CI) users with single-sided deafness (SSD) can be sensitive to interaural time differences (ITDs), crucial for spatial hearing. Synchronizing electric and acoustic signals aids ITD perception and optimizes CI fitting.

Keywords:
binaural hearingcochlear implantinteraural time differencesingle-sided deafness

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Area of Science:

  • Auditory Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • A growing population of cochlear implant (CI) users have single-sided deafness (SSD) with near-normal hearing in the non-implanted ear.
  • Assessing sensitivity to interaural time differences (ITDs) is crucial for improving spatial perception in these SSD CI users.

Purpose of the Study:

  • To investigate the extent to which SSD CI listeners are sensitive to ITDs.
  • To determine the feasibility of using ITD sensitivity and subjective fusion measures for optimizing CI fitting.

Main Methods:

  • Investigated ITD sensitivity in 11 SSD CI listeners using pulse trains (CI ear) and click trains (acoustic ear).
  • Measured the just noticeable difference (JND) in ITD using an adaptive procedure after establishing level balance and synchronous stimulation.
  • Employed frequency-dependent electrical stimulus delays to synchronize auditory nerve stimulation.

Main Results:

  • Seven out of 11 SSD CI listeners demonstrated ITD sensitivity, with a median JND of 438 μs.
  • Four listeners were not ITD sensitive; one reported binaural fusion, and three did not.
  • A frequency-dependent delay was necessary to enable ITD sensitivity by synchronizing electric and acoustic signals.

Conclusions:

  • ITD sensitivity is achievable in a subset of SSD CI users.
  • Subjective fusion measures combined with ITD sensitivity testing can guide the allocation of acoustic frequency ranges to CI electrodes.
  • This approach demonstrates feasibility for optimizing CI fitting in individuals with contralateral hearing.