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Frequency discrimination by the fetus

S Shahidullah1, P G Hepper

  • 1Department of Obstetrics and Gynaecology, Queen's University of Belfast, UK.

Early Human Development
|January 1, 1994
PubMed
Summary
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Human fetuses can distinguish between different sounds, like pure tones and speech, by 35 weeks of gestation. This auditory discrimination ability develops significantly during the third trimester of pregnancy.

Area of Science:

  • Auditory Neuroscience
  • Developmental Psychology
  • Fetal Development

Background:

  • Auditory discrimination is crucial for language development.
  • Fetuses respond to sound, but their ability to discriminate is not fully understood.

Purpose of the Study:

  • To investigate fetal ability to discriminate between pure tones (250 Hz vs. 500 Hz).
  • To examine fetal ability to discriminate between speech sounds ([ba] vs. [bi]).
  • To assess developmental changes in auditory discrimination from 27 to 35 weeks of gestation.

Main Methods:

  • Habituation paradigm used to test fetal responses.
  • Stimuli included pure tones and consonant-vowel speech sounds.
  • Testing conducted at 27 and 35 weeks of gestational age.

Related Experiment Videos

Main Results:

  • Fetuses demonstrated discrimination between pure tones at 35 weeks.
  • Fetuses showed discrimination between speech sounds at 35 weeks.
  • Auditory discrimination was less developed at 27 weeks compared to 35 weeks.

Conclusions:

  • Fetal auditory system shows significant development in sound discrimination by 35 weeks.
  • Early auditory experiences may influence language perception development.
  • The findings provide insights into the maturation of the fetal auditory pathway.