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Evaluation of fetal exposure to environmental noise using a computer-generated model.

Pierre Gélat1, Elwin van 't Wout2, Reza Haqhenas3

  • 1Division of Surgery and Interventional Science, Faculty of Medical Sciences, University College London.

Research Square
|December 9, 2024
PubMed
Summary

The maternal abdomen does not shield fetuses from external noise, as sound transmission in utero is minimally attenuated below 1 kHz. Understanding the fetal auditory environment is crucial for protecting fetal development from damaging noise levels.

Keywords:
Computational AcousticsFetal auditory systemFetal earFetal sound exposureHearing damageIn-utero acousticsNoise pollutionPregnancyPrenatal sound exposure

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Area of Science:

  • Acoustic physics
  • Fetal development
  • Bioacoustics

Background:

  • Acoustic noise negatively impacts maternal wellbeing and fetal development.
  • Auditory learning in utero suggests neural memory traces are formed by sound exposure.
  • Understanding the fetal auditory environment is critical for mitigating risks from noise pollution.

Purpose of the Study:

  • To quantify the acoustic field within the pregnant maternal abdomen.
  • To determine sound transmission characteristics and pressure patterns in the fetal auditory environment.
  • To assess the protective role of the maternal abdomen against external noise.

Main Methods:

  • Utilized anatomical data from MRI scans (N = 3).
  • Employed a computational model to simulate acoustic transfer characteristics.
  • Generated acoustic pressure maps at various frequencies (5 kHz, 10 kHz, 20 kHz).

Main Results:

  • Calculations revealed sound transmission in utero is attenuated by only 6 dB below 1 kHz.
  • Observed multiple scattering and modal patterns within the uterus.
  • Confirmed that the maternal abdomen and pelvis offer minimal shielding from external noise.

Conclusions:

  • The fetal auditory environment is not significantly protected from external acoustic noise.
  • Findings align with animal studies indicating limited attenuation of sound.
  • Highlights the need for further research into the effects of noise on fetal auditory learning and development.