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Related Experiment Videos

Dichotic perception and laterality in neonates.

J Bertoncini1, J Morais, R Bijeljac-Babic

  • 1Laboratoire de Sciences Cognitives et Psycholinguistique CNRS, Paris.

Brain and Language
|November 1, 1989
PubMed
Summary
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Four-day-old infants show a preference for right-ear speech sound changes, indicating early brain specialization. This study reveals precocious perceptual asymmetries in neonates using the High-Amplitude-Sucking procedure.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Auditory Perception

Background:

  • Neonatal auditory processing capabilities are not fully understood.
  • Early brain specialization influences sensory perception development.

Purpose of the Study:

  • To investigate dichotic speech discrimination in 4-day-old neonates.
  • To explore potential ear differences and brain specialization in early auditory perception.

Main Methods:

  • Utilized the High-Amplitude-Sucking (HAS) procedure for testing.
  • Compared responses to syllable changes and music timbre across ears.
  • Included a control group for speech discrimination assessment.

Main Results:

  • Neonates showed a stronger reaction to right-ear syllable changes compared to left-ear changes.

Related Experiment Videos

  • A significant Stimulus Type x Ear interaction indicated perceptual asymmetries.
  • Evidence suggests precocious brain specialization for auditory stimuli.

    • Conclusions:

    • Four-day-old neonates exhibit right-ear advantage in speech sound discrimination.
    • Auditory perceptual asymmetries are present very early in human development.
    • Findings suggest early-onset brain lateralization for auditory processing.