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Bilateral cochlear implants in children: localization acuity measured with minimum audible angle.

Ruth Y Litovsky1, Patti M Johnstone, Shelly Godar

  • 1Waisman Center, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA. litovisky@waisman.wise.edu

Ear and Hearing
|February 1, 2006
PubMed
Summary
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Children with sequential bilateral cochlear implants (BI) show improved sound localization with two implants compared to one. Bilateral cochlear implants offer better sound localization than a cochlear implant plus a hearing aid.

Area of Science:

  • Audiology
  • Neuroscience
  • Speech and Hearing Sciences

Background:

  • Bilateral cochlear implantation (BI) in children involves sequential procedures, leading to varied auditory experience between ears.
  • Assessing sound localization acuity is crucial for auditory development and spatial awareness in children with hearing impairments.

Purpose of the Study:

  • To evaluate sound localization in children with sequential BI cochlear implants.
  • To determine the impact of BI auditory experience on sound localization.
  • To investigate the benefit of a hearing aid in the non-implanted ear for sound localization.

Main Methods:

  • Two groups of children were studied: 13 with BI cochlear implants and 6 with a cochlear implant plus a hearing aid.
  • Minimum audible angle thresholds were measured using computerized interactive software in sound-treated booths.

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  • Testing was conducted in bilateral and monaural listening conditions.

    • Main Results:

    • Approximately 70% of children with BI cochlear implants discriminated sound sources at separations of 20 degrees or less.
    • Children with BI cochlear implants performed better bilaterally than with a single implant.
    • Performance was generally better with the first cochlear implant than the second, suggesting improvement with auditory experience.

    Conclusions:

    • Many children with sequential BI cochlear implants demonstrate enhanced sound localization with two implants compared to one.
    • Bilateral cochlear implants generally yield better sound localization outcomes than a cochlear implant combined with a hearing aid.
    • Further research with larger populations is needed to fully understand the long-term benefits and contributing factors for BI cochlear implant use.