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Interaural stimulation timing in single sided deaf cochlear implant users.

S Zirn1, S Arndt1, A Aschendorff1

  • 1Department of Oto-Rhino-Laryngology of the Medical Center, University of Freiburg, Killianstraße 5, 79106 Freiburg, Germany.

Hearing Research
|August 26, 2015
PubMed
Summary
This summary is machine-generated.

Cochlear implants (CI) alter sound timing, affecting sound localization. This study quantizes these timing differences to guide adjustments for better binaural hearing in CI and hearing aid (HA) users.

Keywords:
Bimodal hearingCochlear implantHearing aidInteraural stimulation timingMED-EL cochlear implant systemsProcessing delaySingle sided deafness

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Area of Science:

  • Auditory Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • Interaural time difference (ITD) is crucial for sound localization, with humans detecting changes as small as 10 μs.
  • Cochlear implants (CI) alter ITD due to partial replacement of the auditory system, while hearing aids (HA) add processing delays.
  • Understanding these timing alterations is vital for optimizing auditory device fitting and user experience.

Purpose of the Study:

  • To quantify interaural stimulation timing between acoustic hearing, CI, and HA modalities.
  • To estimate the need for central auditory temporal compensation in single-sided deaf CI users or bimodal CI/HA users.
  • To inform the development of strategies for improved binaural hearing with auditory implants and aids.

Main Methods:

  • Measured wave V latencies of auditory brainstem responses (ABR) acoustically and electrically via CI (EABR).
  • Calculated total CI channel delay by summing audio processor signal processing and EABR wave V latencies.
  • Compared CI-induced delays with ABR latencies from the contralateral unaided or HA-equipped ear across frequency bands.

Main Results:

  • EABR wave V latencies were consistently shorter than acoustic ABR latencies in unaided ears.
  • Current MED-EL CI system delays are similar to those of an unaided ear.
  • Bimodal CI/HA users require an adjustable across-frequency delay of 1-11 ms in the CI for optimal timing.

Conclusions:

  • Artificial delays can be implemented in CI audio processors to adjust interaural stimulation timing.
  • Bimodal CI/HA users may benefit from specific delay adjustments to enhance binaural hearing and device acceptance.
  • Optimizing interaural timing can reduce the need for central auditory compensation in users of auditory implants and hearing aids.