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Functional neuroimaging of speech perception in infants.

Ghislaine Dehaene-Lambertz1, Stanislas Dehaene, Lucie Hertz-Pannier

  • 1Laboratoire de Sciences Cognitives et Psycholinguistique, CNRS & Ecole des Hautes Etudes en Sciences Sociales, 54 Boulevard Raspail, 75270 Paris Cedex 06, France. ghis@lscp.ehess.fr

Science (New York, N.Y.)
|December 10, 2002
PubMed
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Three-month-old infants show brain activity in language areas similar to adults. This early language processing occurs even before infants can speak, suggesting innate language foundations.

Area of Science:

  • Developmental Neuroscience
  • Cognitive Neuroscience
  • Linguistics

Background:

  • Human infants start language acquisition within the first few months of life.
  • Understanding the neural basis of early language processing is crucial for developmental studies.

Purpose of the Study:

  • To identify brain regions involved in language processing in 3-month-old infants.
  • To compare brain activity during language tasks in awake versus sleeping infants.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Infants were exposed to normal and reversed speech stimuli.
  • Brain activity was recorded while infants were awake and asleep.

Main Results:

Related Experiment Videos

  • Left-lateralized brain regions, including the superior temporal and angular gyri, showed activation, mirroring adult language areas.
  • The right prefrontal cortex was activated only in awake infants processing normal speech.
  • These findings indicate early, pre-verbal language processing in the infant brain.

Conclusions:

  • Precursors to adult cortical language networks are present and active in 3-month-old infants.
  • Language processing in infancy is lateralized similarly to adults.
  • State of alertness (awake vs. sleep) influences language processing in the infant brain.