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Cross correlation studies in primate motor cortex: synaptic interaction and shared input.

J T Murphy, H C Kwan, Y C Wong

    The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
    |February 1, 1985
    PubMed
    Summary
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    Neural recordings in monkeys reveal that neurons in the precentral cortex communicate through synaptic connections during voluntary movements. Stronger connections exist between neurons in the same functional column, suggesting localized neural processing.

    Area of Science:

    • Neuroscience
    • Motor Control
    • Computational Neuroscience

    Background:

    • The precentral cortex is crucial for planning and executing voluntary movements.
    • Understanding neural communication within this area is key to deciphering motor control mechanisms.

    Purpose of the Study:

    • To investigate synaptic interactions between neurons in the precentral cortex during voluntary forelimb movements.
    • To determine how the functional organization of cortical columns influences neural communication.

    Main Methods:

    • Extracellular recordings of neuronal spike trains from pairs of neurons in awake, unrestrained monkeys.
    • Cross-correlation analysis to identify synaptic excitation and inhibition.
    • Intracortical microstimulation and passive sensory stimulation to define functional columns.

    Related Experiment Videos

    Main Results:

    • Synaptic excitation and inhibition were observed between neuronal pairs during voluntary movement.
    • Correlation strength decreased with increasing distance between functional columns.
    • Inhibitory correlations were primarily found within single columns.
    • Shared input was localized to same and adjacent joint-controlling zones within a column.

    Conclusions:

    • Neural communication in the precentral cortex is organized spatially, with stronger interactions within functional columns.
    • Inhibitory connections play a significant role in local circuit function.
    • The findings support a nested organization of the forelimb motor area.