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Related Experiment Videos

Auditory localization abilities in bilateral cochlear implant recipients.

Carl A Verschuur1, Mark E Lutman, Richard Ramsden

  • 1Hearing and Balance Center, Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton, UK. cav@isvr.soton.ac.uk

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|September 10, 2005
PubMed
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Bilateral cochlear implants significantly improve sound localization in the horizontal plane compared to single implants. Dual microphones offered no additional benefit for localization in this study.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Auditory localization is crucial for spatial hearing.
  • Bilateral cochlear implantation (CI) aims to restore binaural hearing.
  • The advantage of binaural hearing for sound localization with CIs requires further quantification.

Purpose of the Study:

  • To quantify the binaural advantage for horizontal plane auditory localization in bilateral CI recipients.
  • To assess the efficacy of dual microphones in improving localization with a single CI.

Main Methods:

  • Twenty bilateral CI users (Nucleus 24 K/M) participated.
  • Sound localization was tested using an 11-loudspeaker array in an anechoic room.
  • Localization was assessed under four conditions: right CI, left CI, binaural CI, and dual microphone, with five different stimuli.

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Main Results:

  • Bilateral CI use resulted in a mean localization error of 24 degrees, significantly better than monaural CI (67 degrees) or dual microphone (67 degrees).
  • Binaural performance was superior to monaural performance across all subjects and stimulus types.
  • Monaural localization performance was at chance level (65 degrees).

Conclusions:

  • Bilateral cochlear implantation markedly improves horizontal plane sound localization compared to unilateral use.
  • All subjects and stimulus types showed benefit from bilateral CIs.
  • Binaural CI performance, while improved, remained inferior to normal hearing listeners; dual microphones provided no localization benefit.