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Related Experiment Videos

Evoked acoustic emissions from the human ear. V. Developmental changes.

N J Johnsen1, J Parbo, C Elberling

  • 1Department of Audiology, Gentofte University Hospital, Hellerup.

Scandinavian Audiology
|January 1, 1989
PubMed
Summary

Evoked acoustic emissions in children were recorded at birth and again at age four. While hearing remained normal, some emissions showed lower frequencies at age four, suggesting cochlear development changes.

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Area of Science:

  • Pediatric audiology
  • Otoacoustic emissions research
  • Auditory system development

Background:

  • Evoked acoustic emissions (EAEs) are objective measures of cochlear function.
  • Early detection of hearing impairment is crucial for child development.
  • Longitudinal studies track auditory system changes over time.

Purpose of the Study:

  • To re-examine evoked acoustic emissions in children previously tested at birth.
  • To assess changes in EAEs from infancy to early childhood.
  • To correlate EAE findings with cochlear development.

Main Methods:

  • Evoked acoustic emissions were recorded at birth and again at age 4 years in 20 children.
  • Otoscopy and tympanometry were performed to ensure middle ear health.

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  • EAE recordings were analyzed for latency, amplitude, and frequency content.

    • Main Results:

    • All children had normal hearing and reproducible EAEs at age 4.
    • EAE latency and amplitude remained consistent between recordings.
    • A decrease in the dominant frequency of EAEs was observed in some ears by age four.

    Conclusions:

    • Childhood cochlear development may influence the frequency characteristics of evoked acoustic emissions.
    • EAEs remain a reliable indicator of cochlear function in young children.
    • Further research into cochlear development and EAE frequency changes is warranted.