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Auditory perception in early lateralized brain damage.

M Bergman, H Costeff, V Koren

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |June 1, 1984
    PubMed
    Summary
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    Children with early left hemisphere damage can develop speech processing in the opposite brain hemisphere by age 3. This hemispheric transfer for cognitive functions appears unique to early brain development.

    Area of Science:

    • Neuroscience
    • Developmental Psychology
    • Speech Perception

    Background:

    • Hemispheric dominance for speech perception is well-established in adults.
    • Early brain damage can impact cognitive function lateralization.
    • Understanding developmental plasticity is crucial for neurological recovery.

    Purpose of the Study:

    • To investigate hemispheric dominance for speech perception in children with early hemiplegia.
    • To determine the age at which speech processing lateralization is completed in cases of early left hemisphere damage.
    • To compare developmental plasticity in children with acquired brain damage to adult stroke patients.

    Main Methods:

    • Compared speech perception performance in 28 children with congenital/infantile hemiplegia to controls.

    Related Experiment Videos

  • Included non-aphasic adults with recent cerebrovascular accident (CVA) for comparison.
  • Utilized established methods for assessing hemispheric dominance in speech perception.

    • Main Results:

    • Confirmed that speech processing dominance transfers to the right hemisphere in children with early left hemisphere damage.
    • Demonstrated that this hemispheric transfer can be completed as early as 3 years of age.
    • Found evidence that this compensatory mechanism is less effective in adults with later-onset brain damage.

    Conclusions:

    • Hemispheric transfer for speech processing is a completed developmental process in childhood.
    • Early childhood (by age 3) is a critical period for establishing alternative hemispheric dominance for speech.
    • Cognitive functions lateralized early in life show greater plasticity compared to later in life.