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Maturation of human cortical auditory function: differences between normal-hearing children and children with

C W Ponton1, M Don, J J Eggermont

  • 1Electrophysiology Department, House Ear Institute, Los Angeles, California, USA.

Ear and Hearing
|October 1, 1996
PubMed
Summary

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Cochlear implants show delayed cortical auditory maturation in children, with P1 latency maturation delayed by approximately 5 years. Auditory evoked responses (AERs) suggest maturation resumes after cochlear implant use.

Area of Science:

  • Neuroscience
  • Audiology
  • Developmental Psychology

Background:

  • Cortical auditory function undergoes significant maturation during childhood and adolescence.
  • Cochlear implantation provides auditory stimulation for individuals with severe to profound hearing loss.

Purpose of the Study:

  • To investigate the maturation of cortical auditory function in normal-hearing children compared to children using cochlear implants.
  • To analyze auditory evoked responses (AERs) as a measure of cortical auditory development.

Main Methods:

  • Auditory evoked responses (AERs) were recorded from normal-hearing children and adults, and from children and adults with cochlear implants.
  • Morphological and latency changes of AERs at electrode Cz were analyzed.

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Main Results:

  • Normal-hearing children show gradual AER maturation through adolescence, with P1 latency reaching adult levels in late teens.
  • Implanted children exhibit similar P1 latency maturation rates but with an approximate 5-year delay.
  • N1 and P2 features of AERs are often delayed or absent in implanted children.

Conclusions:

  • Cortical auditory maturation shows both similarities and delays in cochlear implant users compared to normal-hearing peers.
  • The 5-year delay in P1 latency maturation correlates with the duration of pre-implantation deafness.
  • Auditory deprivation appears to halt cortical auditory maturation, which resumes upon reintroduction of auditory stimulation.