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Related Experiment Videos

Simultaneous bilateral cochlear implants: Developmental advances do not yet achieve normal cortical processing.

Vijayalakshmi Easwar1,2, Hiroshi Yamazaki1, Michael Deighton1

  • 1Archie's Cochlear Implant Laboratory The Hospital for Sick Children Toronto ON Canada.

Brain and Behavior
|April 18, 2017
PubMed
Summary

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This summary is machine-generated.

Simultaneous bilateral cochlear implants promote auditory pathway symmetry but do not fully restore binaural hearing. Cortical processing in children with bilateral cochlear implants shows persistent abnormalities, including altered sensory integration and attention.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Clinical Audiology

Background:

  • Simultaneous bilateral cochlear implantation (CI) aims for symmetric auditory pathway development.
  • However, binaural hearing often remains impaired despite bilateral CI.
  • This study investigates persistent bilateral cortical processing deficits in children with bilateral CIs.

Purpose of the Study:

  • To evaluate bilateral cortical processing in children with simultaneous bilateral CIs.
  • To assess electrically driven cortical development in the absence of sequential implantation asymmetries.
  • To compare cortical activity in children with bilateral CIs to normal-hearing children.

Main Methods:

  • Measured cortical activity using multichannel electro-encephalography (EEG).
Keywords:
auditory brainbeamformerbilateral cochlear implantchildrencortical aural preferencecortical lateralizationdevelopmentelectro‐encephalogramhearing lossspeech perception

Related Experiment Videos

  • Assessed responses to unilateral and bilateral auditory stimuli.
  • Localized source activity using the Time Restricted, Artefact and Coherence source Suppression (TRACS) beamformer method.

    • Main Results:

    • Children with bilateral CIs showed minimal differences between ipsilateral, contralateral, and bilateral stimuli.
    • They exhibited weaker-than-normal contralateral stimulus preference and symmetric bilateral activity.
    • Increased occipital lobe recruitment and altered activity in parieto-occipital and frontal lobes were observed.

    Conclusions:

    • Early simultaneous bilateral CI promotes auditory symmetry but does not normalize cortical processing.
    • Deficits in sensory integration and increased attention persist.
    • Abnormalities may stem from early deafness or electrical stimulation via two speech processors.