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Related Experiment Videos

Development of fetal hearing

P G Hepper1, B S Shahidullah

  • 1Queen's University of Belfast, Northern Ireland, School of Psychology.

Archives of Disease in Childhood. Fetal and Neonatal Edition
|September 1, 1994
PubMed
Summary
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Fetal hearing develops progressively, with fetuses responding to low frequencies first and gradually expanding to higher tones. This auditory maturation impacts language acquisition and susceptibility to sound-induced damage.

Area of Science:

  • Developmental biology
  • Auditory neuroscience
  • Fetal development

Background:

  • Human fetuses exhibit responses to auditory stimuli.
  • Systematic investigation into the developmental trajectory of fetal hearing is limited.

Purpose of the Study:

  • To systematically examine the development of fetal behavioral responsiveness to pure tone auditory stimuli.
  • To map the emergence and expansion of fetal hearing sensitivity across a range of frequencies and gestational ages.

Main Methods:

  • Pure tone auditory stimuli (100 Hz, 250 Hz, 500 Hz, 1000 Hz, 3000 Hz) were presented to fetuses between 19 and 35 weeks of gestational age.
  • Stimuli were delivered via a loudspeaker placed on the maternal abdomen.
  • Fetal movements in response to stimuli were recorded using ultrasound.

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Main Results:

  • The earliest fetal response was observed at 19 weeks of gestational age to a 500 Hz tone.
  • Responsiveness expanded from low frequencies (100 Hz, 250 Hz) to higher frequencies (1000 Hz, 3000 Hz) as gestation progressed.
  • By 27 weeks, fetuses responded robustly to 250 Hz and 500 Hz, but not higher frequencies. Full responsiveness to 1000 Hz and 3000 Hz was achieved by 33 and 35 weeks, respectively.
  • Auditory sensitivity increased significantly, with a 20-30 dB decrease in required intensity for a response as fetuses matured.

Conclusions:

  • The observed pattern of fetal auditory responsiveness reflects the maturation of the fetal auditory system.
  • Early sensitivity to low-frequency sounds may play a role in subsequent language acquisition.
  • Increased fetal sensitivity to low frequencies may heighten susceptibility to auditory damage from intense low-frequency sound exposure.