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Related Experiment Videos

Cochlear microphonics recorded from fetal and newborn sheep.

K J Gerhardt¹, R Otto, R M Abrams

¹Department of Communication Processes and Disorders, University of Florida, Gainesville 32611.

American Journal of Otolaryngology

|July 1, 1992

Summary

The fetal auditory system is significantly isolated from external sounds, with sound attenuation increasing with frequency. This suggests potential risks to fetal hearing from intense noise exposure, warranting further investigation.

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Area of Science:

Otoacoustic Emissions
Fetal Auditory Development
Maternal-Fetal Medicine

Background:

The fetal inner ear and central auditory pathway are stimulated by uterine sounds.
Understanding fetal auditory system isolation is crucial for assessing external sound impacts.
Exogenous airborne stimuli transmission to the fetal ear requires quantification.

Purpose of the Study:

To determine the efficiency of exogenous airborne stimuli transmission to the fetal inner ear.
To quantify the isolation of the fetal auditory system from external sounds.
To evaluate the impact of maternal sound transmission on fetal hearing.

Main Methods:

Cochlear microphonics were recorded from fetal and newborn sheep.
Electrodes were placed on the round window membrane of near-term fetal sheep.

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Sound pressure levels were measured ex utero and in utero during noise exposure.

Main Results:

Sound attenuation varied across frequencies, ranging from 11.1 dB at 0.125 kHz to 45.0 dB at 2.0 kHz.
The fetus demonstrated significant isolation from external sounds, particularly at higher frequencies.
Calculated fetal sound isolation revealed frequency-dependent attenuation.

Conclusions:

The immature auditory system is more vulnerable to noise-induced damage than the mature system.
Low-frequency noise exposure can lead to cellular damage affecting higher frequency coding later in life.
Intense noise exposure poses a potential risk for fetal hearing loss, requiring careful evaluation.