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Sound-direction identification with bilateral cochlear implants.

Arlene C Neuman1, Anita Haravon, Nicole Sislian

  • 1The Graduate Center, City University of New York, New York, New York, USA. arlene.neuman@med.nyu.edu

Ear and Hearing
|January 6, 2007
PubMed
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Bilateral cochlear implants significantly improve sound-direction identification accuracy compared to single implants. Both speech and pink noise stimuli are effective for testing localization in cochlear implant users.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Accurate sound localization is crucial for auditory perception.
  • Bilateral cochlear implants (CIs) aim to restore binaural hearing.
  • Limited research exists on sound localization accuracy with bilateral CIs using different stimuli.

Purpose of the Study:

  • To compare sound-direction identification accuracy in bilateral CI users.
  • To evaluate localization performance with speech versus pink noise stimuli.
  • To assess the benefit of bilateral CIs over single CIs for sound localization.

Main Methods:

  • Eight adult bilateral CI users participated.
  • Localization was tested using a nine-loudspeaker array in a classroom.

Related Experiment Videos

  • Stimuli included speech and pink noise bursts under bilateral, left CI, and right CI conditions.

    • Main Results:

    • Sound-direction identification accuracy was significantly better with bilateral CIs (mean error 29°) than with single CIs (left: 54°, right: 46.5°).
    • Unilateral localization accuracy was comparable between left and right CIs.
    • Localization performance was similar for both speech and pink noise stimuli.

    Conclusions:

    • Bilateral cochlear implants enhance sound-direction identification compared to single implants.
    • Speech and pink noise are equally suitable for assessing sound localization in CI users.
    • Findings support the use of bilateral CIs for improved spatial hearing.