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Speech perception and localization with adults with bilateral sequential cochlear implants.

Richard S Tyler1, Camille C Dunn, Shelley A Witt

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa 52242, USA. rich-tyler@uiowa.edu

Ear and Hearing
|May 15, 2007
PubMed
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Sequential bilateral cochlear implants significantly improve hearing and localization, even years after the first device. Benefits are observed despite differences in implant technology and long periods of single-device use.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Binaural hearing is crucial for speech understanding and spatial awareness.
  • Sequential bilateral cochlear implantation (CI) involves receiving implants in both ears over time.
  • The long-term benefits of sequential CIs, especially with differing device characteristics, require further investigation.

Purpose of the Study:

  • To evaluate binaural hearing improvements in adults with sequential bilateral cochlear implants.
  • To assess speech recognition and sound localization abilities in bilateral CI users.
  • To determine if sequential implantation offers benefits despite long intervals and varied device specifications.

Main Methods:

  • Seven adult sequential bilateral CI users were assessed.

Related Experiment Videos

  • Speech recognition was tested in quiet and noise with varied sound presentation.
  • Bilateral sound localization was evaluated using an everyday sounds test.

    • Main Results:

    • All subjects showed significant bilateral hearing improvement compared to single implant use.
    • Four out of seven subjects demonstrated measurable sound localization abilities.
    • Two subjects showed improved localization after receiving their second implant, even after unilateral use.

    Conclusions:

    • Sequential bilateral cochlear implantation can provide significant benefits for hearing and localization.
    • These benefits are achievable even with long delays between implants and differing device technologies.
    • Sequential implantation is a viable option for improving auditory function in adults previously using single cochlear implants.