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Synapse elimination and plasticity in developing human cerebral cortex.

P R Huttenlocher

    American Journal of Mental Deficiency
    |March 1, 1984
    PubMed
    Summary
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    Early brain development involves synapse overproduction, followed by elimination. This synaptic plasticity in young children can be harnessed for functional retraining, as seen in amblyopia treatment.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Pediatrics

    Background:

    • Neural systems exhibit overproduction of structures like neurons, dendrites, and synapses during development.
    • In humans, cerebral cortex synaptogenesis occurs prenatally and in early infancy.
    • Peak synaptic density is achieved around one year of age, followed by synapse elimination.

    Purpose of the Study:

    • To explore the phenomenon of synaptic overproduction and subsequent elimination in early brain development.
    • To investigate the potential of early brain plasticity for functional retraining.
    • To highlight the implications of synaptic plasticity for treating developmental disorders.

    Main Methods:

    • Observational analysis of developmental neurobiology.
    • Review of established timelines for synaptogenesis and synapse elimination in the human cerebral cortex.

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  • Case study analysis of therapeutic interventions leveraging brain plasticity.

    • Main Results:

    • Synaptic density peaks by age 1 year, with rapid elimination occurring during preschool years.
    • Synapse overproduction in early childhood may confer significant brain plasticity.
    • Functional impairments can potentially be reversed by exploiting this developmental plasticity.

    Conclusions:

    • The transient overproduction of synapses during early development is a critical period for brain plasticity.
    • This plasticity offers a window of opportunity for therapeutic interventions aimed at functional recovery.
    • Examples like amblyopia reversal demonstrate the practical application of leveraging early brain plasticity.