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Speech perception, localization, and lateralization with bilateral cochlear implants.

Richard J M van Hoesel1, Richard S Tyler

  • 1CRC for Cochlear Implant and Hearing Aid Innovation, Melbourne, Victoria, Australia. r.vanh@medoto.unimelb.edu.au

The Journal of the Acoustical Society of America
|March 27, 2003
PubMed
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Bilateral cochlear implants significantly improve sound localization and speech understanding in noise for users. These devices offer substantial benefits over single implants, enhancing spatial hearing and auditory perception.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implants (CIs) are vital for hearing restoration.
  • Bilateral CI use is increasingly common, but its benefits require further investigation.
  • Understanding spatial hearing with CIs is crucial for improving speech perception in complex acoustic environments.

Purpose of the Study:

  • To evaluate the impact of bilateral cochlear implantation on sound localization and speech understanding in noise.
  • To assess the influence of interaural time delays (ITDs) and interaural level differences (ILDs) on auditory perception in CI users.
  • To compare binaural and monaural listening conditions in individuals with bilateral CIs.

Main Methods:

  • Tested five bilateral CI users on localization and speech reception in noise (SRT) under monaural and binaural conditions.

Related Experiment Videos

  • Conducted lateralization tasks manipulating ITDs and ILDs using electrical pulse trains.
  • Utilized an eight-loudspeaker array for localization and spectrally matched noise for SRT measurements.

    • Main Results:

    • Bilateral CI use significantly improved sound localization accuracy (10-degree error) compared to unilateral use (20-60 degrees).
    • Bilateral CI users demonstrated substantial SRT benefits in noise, especially with noise ipsilateral to the device, due to head-shadow effects.
    • Sensitivity to ILDs was high, while ITD sensitivity was moderate and dependent on stimulation rate and modulation.

    Conclusions:

    • Bilateral cochlear implantation provides significant advantages for sound localization and speech comprehension in noisy, spatially separated environments.
    • Interaural level differences play a more critical role than interaural time differences in binaural hearing with CIs.
    • These findings underscore the importance of bilateral CI fitting for optimizing auditory spatial perception and communication abilities.