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Related Experiment Videos

Neonatal otoacoustic emissions recorded using maximum length sequence stimuli

A Slaven1, A R Thornton

  • 1MRC Institute of Hearing Research, Southampton, United Kingdom.

Ear and Hearing
|April 30, 1998
PubMed
Summary

Maximum length sequence (MLS) stimulation effectively records transient evoked otoacoustic emissions (TEOAEs) in newborns, similar to adults. This high-rate technique is feasible for neonatal hearing screening on postnatal wards.

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Area of Science:

  • Audiology
  • Neonatal Hearing Screening
  • Otoacoustic Emissions

Background:

  • Transient evoked otoacoustic emissions (TEOAEs) are crucial for assessing auditory function.
  • Maximum length sequence (MLS) stimulation enables TEOAE recording at high rates, previously studied mainly in adults.

Purpose of the Study:

  • To investigate TEOAEs using MLS stimulation in newborns.
  • To compare neonatal MLS TEOAEs with those from adult subjects.
  • To assess the feasibility of MLS TEOAE recording in a clinical neonatal setting.

Main Methods:

  • TEOAEs were recorded from newborns at 13 different stimulation rates.
  • A subset of neonates and adults were tested at conventional (40 clicks/sec) and high MLS rates (5000 clicks/sec).

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Main Results:

  • Neonatal MLS TEOAEs exhibited similar waveform morphology and amplitude reduction patterns compared to adults.
  • Emission amplitude decreased with increasing stimulus rate, plateauing between 1000-2000 clicks/sec.
  • Amplitude reduction at high rates was consistent, whether expressed as a percentage or proportion of conventional TEOAE amplitude.

Conclusions:

  • The speed and sensitivity advantages of MLS TEOAEs are applicable to neonates.
  • Adequate TEOAEs were recorded from newborns in a ward-based setting using a prototype system.
  • MLS stimulation shows promise for efficient neonatal hearing screening.