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Updated: Jun 16, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Performance over time on adults with simultaneous bilateral cochlear implants.

Son-A Chang1, Richard S Tyler, Camille C Dunn

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, IA 52242, USA.

Journal of the American Academy of Audiology
|January 21, 2010
PubMed
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Bilateral cochlear implants significantly improve word recognition and sound localization within the first year, with benefits sustained for up to six years. Long-term data suggest continued development of binaural advantages over time.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Growing number of bilateral cochlear implant (CI) recipients necessitates research on device performance.
  • Understanding long-term outcomes is crucial for maximizing patient benefits.

Purpose of the Study:

  • To evaluate the long-term (up to 6 years) word recognition and sound localization performance in adults with simultaneous bilateral cochlear implants (CI+CI).

Main Methods:

  • Longitudinal study tracking word recognition (CNC) and sound localization (Everyday Sounds Localization Test) in 48 adult CI+CI recipients.
  • Data analyzed over time, with specific focus on performance changes between 12 and 48+ months post-implantation.

Main Results:

  • Word recognition scores improved significantly up to 1 year, plateauing around 63% after 2 years. However, some subjects showed continued improvement between 12-48+ months.

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  • Sound localization improved up to 1 year, reaching a plateau around 20 degrees RMS error after 2 years. No significant improvement was observed between 12-48+ months in a subset of patients.
  • Significant individual variability in performance over time was noted for both measures.

    • Conclusions:

    • Simultaneous bilateral cochlear implants provide substantial and sustained benefits for word recognition and sound localization up to 6 years post-implantation.
    • Binaural advantages may require more than one year to fully develop in some individuals.
    • Long-term performance demonstrates the efficacy of bilateral cochlear implantation for improving auditory function.