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Intercellular relationships in elementary neuronal ensembles.

A B Kogan

    Neuroscience and Behavioral Physiology
    |September 1, 1986
    PubMed
    Summary
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    This study investigates how cortical neurons form functional ensembles for information processing. It reveals that stable, early-responding neurons form ensemble centers, while variable, later-responding neurons create plasticity.

    Area of Science:

    • Neuroscience
    • Computational Neuroscience
    • Systems Neuroscience

    Background:

    • The cerebral cortex processes information through complex neural networks.
    • Understanding how neuronal groups form functional units is crucial for deciphering brain mechanisms.
    • Cortical ensembles are hypothesized to be fundamental for coding incoming information.

    Purpose of the Study:

    • To investigate the mechanisms by which cortical neurons combine into discrete functional modules or elementary ensembles.
    • To elucidate the roles of different neuronal populations in ensemble formation and information coding.
    • To explore the basis of plasticity in cortical mechanisms.

    Main Methods:

    • Investigated the response properties of neurons to specific afferent inputs.

    Related Experiment Videos

  • Analyzed the temporal dynamics (latent periods) of neuronal activation within ensembles.
  • Examined the role of intracortical and ascending inhibitory pathways.

    • Main Results:

    • Identified specific afferent-activated neurons as stable centers of ensembles with minimal latent periods.
    • Demonstrated that secondarily activated neurons form the ensemble periphery, exhibiting variable responses and longer latent periods.
    • Found that stochastic participation of peripheral neurons underlies cortical plasticity.
    • Observed that inhibited neurons are located at the periphery and near output cells of ensembles.

    Conclusions:

    • Cortical ensembles are formed by a core of stable, rapidly responding neurons and a periphery of dynamically participating neurons.
    • The variable recruitment of peripheral neurons is the basis for the plasticity of cortical information processing.
    • Inhibitory neuronal circuits play a role in shaping ensemble activity and output.