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Related Experiment Video

Updated: Jun 25, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Simultaneous bilateral cochlear implantation: prospective study in adults.

Dawn Burton Koch1, Sigfrid D Soli, Mark Downing

  • 1House Ear Institute, Los Angeles, California, United States.

Cochlear Implants International
|February 28, 2009
PubMed
Summary

Individuals with two cochlear implants experienced significant benefits, including better sound localization and speech understanding in noisy environments, compared to using a single implant. This research highlights the advantages of bilateral cochlear implantation.

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Normal-hearing individuals benefit from binaural hearing for sound localization and speech-in-noise perception.
  • Bilateral cochlear implantation offers the potential for similar advantages in hearing-impaired individuals.

Purpose of the Study:

  • To evaluate the benefits of bilateral versus unilateral cochlear implant listening.
  • To assess speech perception and sound localization in users of two cochlear implants.

Main Methods:

  • 15 postlinguistically deafened adults with simultaneous bilateral Harmony (HiRes 90K) cochlear implants participated.
  • Speech perception in quiet and noise, and sound localization accuracy were measured for unilateral and bilateral conditions.

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Last Updated: Jun 25, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
06:04

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Robotic Cochlear Implantation for Direct Cochlear Access
08:06

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

Main Results:

  • Bilateral cochlear implant use significantly improved sound localization accuracy compared to unilateral use.
  • Speech perception in both quiet and noisy conditions was better with two implants than with one.

Conclusions:

  • Bilateral cochlear implantation provides significant auditory benefits for postlinguistically deafened adults.
  • These benefits include enhanced sound localization and improved speech understanding, mirroring advantages of normal binaural hearing.