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Related Experiment Video

Updated: Jun 21, 2026

Testing a Cochlear Implant Electrode Insertion Training System for Optimal Electrode Array Placement in Different Inner Ear Anatomies
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Testing a Cochlear Implant Electrode Insertion Training System for Optimal Electrode Array Placement in Different Inner Ear Anatomies

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Sensitivity to interaural time difference with bilateral cochlear implants: Development over time and effect of

Becky B Poon1, Donald K Eddington, Victor Noel

  • 1Cochlear Implant Research Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA 02114, USA.

The Journal of the Acoustical Society of America
|July 31, 2009
PubMed
Summary

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Bilateral cochlear implant (CI) users showed improved interaural time difference (ITD) sensitivity over time with processor use. Shorter binaural deprivation led to faster ITD sensitivity development, crucial for better binaural hearing in CI patients.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Bilateral cochlear implantation (CI) aims to restore binaural hearing.
  • Interaural time difference (ITD) sensitivity is crucial for sound localization and binaural hearing.
  • The impact of sequential implantation and device use on ITD sensitivity is not fully understood.

Purpose of the Study:

  • To measure interaural time difference (ITD) sensitivity in sequentially implanted bilateral cochlear implant (CI) users.
  • To investigate the influence of time post-implantation and bilateral processor use on ITD sensitivity.
  • To assess the effect of electrode position mismatch on ITD sensitivity.

Main Methods:

  • Sensitivity to ITD was measured in four sequentially implanted bilateral CI subjects.

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  • Measurements were taken over time, from immediately after second-ear implantation through months of bilateral processor use.
  • ITD sensitivity was also assessed as a function of inter-electrode position mismatch.

    • Main Results:

    • Two subjects with shorter binaural deprivation showed early ITD sensitivity (pre-processor).
    • The other two subjects developed ITD sensitivity after months of bilateral processor use.
    • CI users required a significantly larger interaural electrode mismatch to halve ITD sensitivity compared to normal-hearing listeners.

    Conclusions:

    • Early ITD sensitivity in bilateral CI users is influenced by the duration of binaural deprivation.
    • Bilateral processor use facilitates the development of ITD sensitivity.
    • A larger tolerance for electrode mismatch in CI users may contribute to suboptimal binaural performance, especially in complex acoustic environments.