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Electrophysiological study of visual processing in children with cochlear implants.

David P Corina1, S Coffey-Corina2, E Pierotti3

  • 1Center for Mind and Brain, University of California, Davis, USA; Department of Linguistics, University of California, Davis, USA; Department of Psychology, University of California, Davis, USA.

Neuropsychologia
|December 25, 2023
PubMed
Summary

Early auditory deprivation in children affects visual evoked potentials (VEPs), suggesting altered visual attention rather than auditory cortex remapping, even after cochlear implantation.

Keywords:
ChildrenCochlear implantCross-modal plasticityDeafVisual evoked potential

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Auditory Neuroscience

Background:

  • Congenital deafness is linked to atypical visual evoked potentials (VEPs).
  • These VEP changes are often interpreted as maladaptive cross-modal plasticity, impacting spoken language acquisition.
  • The visual system may inappropriately reallocate resources from auditory processing.

Purpose of the Study:

  • To compare VEPs in children with congenital deafness who received cochlear implants (CIs) early versus typically developing controls.
  • To investigate the impact of early auditory deprivation on visual processing.
  • To determine if VEP alterations reflect cross-modal plasticity or changes in visual attention.

Main Methods:

  • Utilized a novel electrophysiological paradigm to record VEPs.
  • Compared VEPs in children with congenital deafness receiving CIs before 31 months (n=28) to age-matched controls (n=28).
  • Analyzed VEP components (P1, N1, N1a) and related them to chronological age and spoken language understanding.

Main Results:

  • Observed amplitude enhancements and latency differences in occipital P1 and N1 VEP components in CI-using children.
  • Identified an early frontal negativity (N1a) in the CI group.
  • Found that VEP changes are more consistent with alterations in visual-sensory attention and saliency mechanisms.

Conclusions:

  • Atypical VEPs in children with early auditory deprivation reflect changes in visual attention and saliency, not auditory cortex remapping.
  • Early auditory deprivation can have lasting effects on visual processing, persisting even after cochlear implant activation.
  • These findings challenge the maladaptive plasticity hypothesis and suggest a different mechanism for VEP alterations.