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Development of cortical circuitry and cognitive function.

P S Goldman-Rakic

    Child Development
    |June 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Synaptic density in the primate brain is crucial for cognitive development, particularly for delayed-response function. This research highlights the importance of synaptic formation and elimination for cognitive maturation.

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    Area of Science:

    • Neuroscience
    • Developmental Neuroscience
    • Cognitive Neuroscience

    Background:

    • The neural circuitry for delayed-response function in adult nonhuman primates has been identified.
    • This circuitry involves connections between the principal sulcus, parietal association cortex, limbic cortex, caudate nucleus, and superior colliculus.

    Purpose of the Study:

    • To investigate the developmental trajectory of neural connections and synaptic density underlying cognitive functions.
    • To understand the relationship between synaptic development and the emergence of delayed-response capacity in primates.

    Main Methods:

    • Anatomical tracing in fetal and developing primates.
    • Electromicroscopic analysis of synaptic density in the cerebral cortex.
    • Behavioral assessment of delayed-response task performance in infant primates.

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    Main Results:

    • Cortical connections begin forming by the second trimester of pregnancy.
    • Synaptic density rapidly increases postnatally, peaking between 2-4 months, then declining to adult levels.
    • Delayed-response capacity emerges around 4 months, coinciding with peak synaptic density.

    Conclusions:

    • A critical mass of cortical synapses is essential for the emergence of cognitive functions like delayed response.
    • Mature cognitive capacity may depend on the synaptic "pruning" that occurs during adolescence and young adulthood.
    • Understanding cognitive development's neural basis can inform social, educational, and clinical applications, including developmental disorders.