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Infant Auditory Processing and Event-related Brain Oscillations
06:34

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Transient evoked otoacoustic emissions

Ravi Kapoor1, Naresh K Panda

  • 1Department of Otolayngology, Government Medical College and Hospital, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

Indian Journal of Pediatrics
|July 4, 2006
PubMed

Insights

Transient Evoked Otoacoustic Emissions (TEOAEs) provide reliable hearing screening in children. Neonates show lower signal-to-noise ratios (SNRs) compared to older children, establishing a normative baseline for pediatric audiology.

Area of Science:

  • Pediatric audiology
  • Otoacoustic emissions research
  • Hearing screening methodologies

Background:

  • Transient Evoked Otoacoustic Emissions (TEOAEs) are crucial for assessing cochlear function.
  • Establishing normative data for TEOAEs in pediatric populations is essential for accurate hearing assessments.
  • Previous research has indicated age-related differences in TEOAE parameters.

Purpose of the Study:

  • To establish a normative baseline for Transient Evoked Otoacoustic Emissions (TEOAEs) in normal-hearing children.
  • To collect parametric measures of TEOAEs across different pediatric age groups.
  • To analyze TEOAE amplitude, wave reproducibility, and signal-to-noise ratio (SNR) in neonates, infants, and young children.

Main Methods:

  • Investigated 60 subjects across three age groups: neonates (0-1 month), infants (1 month-1 year), and children (1-6 years), with 20 subjects per group.
  • Subjects underwent comprehensive medical and audiological evaluations, including immittance testing and audiometry.
  • TEOAEs were analyzed for amplitude, cross-correlation (wave reproducibility), and signal-to-noise ratio (SNR) at specific frequencies.

Main Results:

  • No significant difference in mean TEOAE amplitude between right and left ears.
  • Neonates exhibited higher emission amplitudes compared to males in the same age group.
  • Mean amplitude was highest in neonates, decreasing in infants and children; wave reproducibility remained constant across ages.
  • Signal-to-noise ratios (SNRs) were consistently above 3 dB, with neonates showing the lowest SNRs (3.47-9.62 dB) and infants the highest (6.13-13.11 dB).

Conclusions:

  • TEOAE measures of SNR and cross-correlation at 1.5-4 kHz may be more reliable than amplitude for pediatric hearing assessment.
  • Younger children (0-1 month) demonstrate lower SNRs than older age groups.
  • The collected parametric measures serve as valuable normative data for screening and diagnostic purposes in pediatric audiology.
Abstract

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