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Related Experiment Videos

Binaural processing in children using bilateral cochlear implants.

Karen A Gordon1, Jerome Valero, Blake C Papsin

  • 1The Hospital for Sick Children, Toronto, Ontario, Canada. karen.gordon@utoronto.ca

Neuroreport
|April 7, 2007
PubMed
Summary
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Bilateral cochlear implants in children show that the brainstem processes sound differently between the first and second implant. Delayed second implants lead to abnormal binaural processing, impacting auditory development.

Area of Science:

  • Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • Binaural hearing is crucial for sound localization and speech understanding.
  • Cochlear implantation in children aims to restore auditory function, but optimal timing for bilateral implantation is still researched.
  • Understanding auditory brainstem development post-implantation is key to improving outcomes.

Purpose of the Study:

  • To investigate binaural auditory brainstem processing in children with sequential or simultaneous bilateral cochlear implants.
  • To assess the impact of the timing of the second cochlear implant on auditory pathway maturation and binaural integration.

Main Methods:

  • Evoked potential measures were used to assess auditory brainstem function.
  • Forty children with early cochlear implantation were studied, varying the timing of the second implant.

Related Experiment Videos

  • Analysis focused on wave latencies and binaural difference waves in response to different electrode stimulations.

    • Main Results:

    • Auditory pathways showed shorter wave latencies for the experienced (first) implanted ear compared to the naïve (second) ear.
    • Binaural difference waves were observed, primarily with apical electrode stimulation.
    • Prolonged latencies in binaural difference waves were noted in children with delayed second implants.

    Conclusions:

    • Sequential bilateral cochlear implantation, especially with delays, results in immature pathways for the second ear.
    • Abnormal binaural processing timing occurs initially in children with sequential implants due to pathway immaturity.
    • Simultaneous bilateral implantation may support more typical binaural processing development.