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Auditory brainstem response in sheep. Part I: Fetal development

L L Pierson1, K J Gerhardt, S K Griffiths

  • 1U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland, USA.

Developmental Psychobiology
|July 1, 1995
PubMed
Summary

Auditory brainstem response (ABR) in fetal sheep shows rapid waveform and threshold improvements by 123 days gestation. Peak latencies decrease, with significant changes in Waves III and IV during auditory system development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory Neuroscience

Background:

  • The auditory system develops significantly during late gestation.
  • Understanding fetal auditory development is crucial for assessing auditory health.
  • Auditory Brainstem Response (ABR) is a key electrophysiological measure of auditory pathway function.

Purpose of the Study:

  • To characterize the developmental trajectory of the Auditory Brainstem Response (ABR) in fetal sheep in utero.
  • To establish normative ABR data during late fetal development.

Main Methods:

  • Auditory Brainstem Response (ABR) was recorded in fetal sheep.
  • Recordings were taken between 111 and 136 days of gestation (dGA).
  • Clicks and tone bursts were used as auditory stimuli.

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Main Results:

  • ABR was detectable by 111 dGA, with waveform morphology improving significantly by 123 dGA.
  • ABR thresholds to clicks and tone bursts showed rapid improvement between 111 and 123 dGA.
  • Peak latencies decreased throughout development, with Waves III and IV showing greater reductions.

Conclusions:

  • The fetal sheep auditory system demonstrates rapid functional maturation between 111 and 123 days gestation.
  • ABR provides a valuable tool for monitoring auditory development in utero.
  • Further maturation occurs at a slower rate after 123 dGA.