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Development of hemispheric specialization for speech perception.

G Geffen

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |December 1, 1976
    PubMed
    Summary
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    Children aged 5 and older show a right ear advantage for processing speech, indicating left hemisphere specialization. This right ear advantage in verbal listening remains consistent across development.

    Area of Science:

    • Neuroscience
    • Developmental Psychology
    • Auditory Processing

    Background:

    • The dichotic listening task is a standard method for investigating brain lateralization of function.
    • Previous research suggests hemispheric specialization for language processing, with a potential right ear advantage (REA).

    Purpose of the Study:

    • To investigate the developmental trajectory of the right ear advantage (REA) in speech perception.
    • To determine the underlying mechanisms (sensitivity vs. response bias) contributing to the REA.
    • To assess the influence of handedness on auditory processing lateralization.

    Main Methods:

    • Dichotic monitoring task with simultaneous word pair presentation to right-handed children aged 5, 7, and 11 years.
    • Signal detection analysis to differentiate sensitivity and response bias.

    Related Experiment Videos

  • Binaural stimulation with different voice inputs to assess hand effects.

    • Main Results:

    • A significant right ear advantage was observed, with more targets detected and shorter reaction times for right ear stimuli.
    • The magnitude of the REA did not significantly change with age across the studied developmental period.
    • The REA was primarily attributed to greater right ear sensitivity, not response bias; handedness had minimal impact.

    Conclusions:

    • The left hemisphere is specialized for speech signal analysis from at least 5 years of age.
    • This specialization results in a consistent right ear advantage during competitive verbal listening tasks.
    • Developmental changes in attention or language acquisition do not appear to significantly alter this early-established REA.