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Related Experiment Video

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Bimodal Cochlear Implants: Measurement of the Localization Performance as a Function of Device Latency Difference.

Rebecca C Felsheim1,2, Sabine Hochmuth3, Alina Kleinow1

  • 1Department für Medizinische Physik und Akustik, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany.

Trends in Hearing
|November 24, 2025
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Summary

Bimodal cochlear implant users

Keywords:
bimodal hearingcochlear implanthearing aidinteraural latency mismatchsound localization

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Bimodal cochlear implant (CI) users often exhibit impaired sound localization.
  • Processing latency differences between hearing aids and CIs contribute to this deficit.
  • Previous latency adjustments improved localization but were not fully optimized.

Purpose of the Study:

  • To determine the optimal cochlear implant latency for improving sound localization in bimodal users.
  • To investigate if frequency-independent latency adjustments are sufficient.

Main Methods:

  • Eleven bimodal CI users participated in the study.
  • Sound localization performance was measured across various CI latencies.
  • Interaural latency adjustments were applied.

Main Results:

  • Adjusting interaural latency improved localization for most participants.
  • The optimal CI latency was often shorter than predicted for intermediate frequencies.
  • Nine out of eleven subjects preferred a shorter CI latency.

Conclusions:

  • Individualized CI latency adjustments are crucial for optimal sound localization in bimodal users.
  • Current frequency-independent compensation methods may not be sufficient.
  • Further research into personalized latency tuning is warranted.