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Update on bilateral cochlear implantation.

Richard S Tyler1, Camille C Dunn, Shelley A Witt

  • 1University of Iowa, Department of Otolaryngology, Iowa City, USA. rich-tyler@uiowa.edu

Current Opinion in Otolaryngology & Head and Neck Surgery
|September 23, 2003
PubMed
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Bilateral cochlear implants offer potential hearing improvements for individuals with profound hearing loss. Research shows the brain can integrate electrical signals from two implants, enhancing sound localization and head shadow effects.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Unilateral cochlear implants are standard for profound bilateral hearing loss but do not restore normal hearing.
  • Bilateral cochlear implants present an opportunity to further enhance auditory function.

Purpose of the Study:

  • To describe binaural hearing and review published literature on binaural cochlear implants.
  • To assess the potential for central nervous system integration of bilateral electrical stimulation.

Main Methods:

  • Review of controlled laboratory trials examining binaural advantages.
  • Analysis of studies on binaural cochlear implant outcomes.

Main Results:

  • Binaural implants generally improve head shadow effects and sound localization.

Related Experiment Videos

  • Some individuals benefit from summation and squelch effects, indicating neural integration.
  • Benefits vary, with not all implantees experiencing all potential binaural advantages.

    • Conclusions:

    • Experimental studies of binaural cochlear implants are now warranted.
    • Preliminary findings suggest the brain can integrate bilateral electrical stimulation.
    • Further research is needed to optimize binaural hearing with cochlear implants.