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Extracellular fields within the cortex.

H S Green, T Triffet

    Journal of Theoretical Biology
    |July 7, 1985
    PubMed
    Summary
    This summary is machine-generated.

    This study models cortical electrical activity using ionic currents, linking calcium and potassium ion fluctuations to event-related potentials and brain rhythms like alpha and beta. The findings offer a physical basis for neural electrical phenomena.

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    Area of Science:

    • Neuroscience
    • Biophysics
    • Computational Neuroscience

    Background:

    • Nervous activity involves complex ionic currents.
    • Understanding extracellular potential variations is crucial for brain function analysis.

    Purpose of the Study:

    • To extend a physical theory of ionic currents to model cortical electrical activity.
    • To explain event-related potentials and brain rhythms based on ion dynamics.

    Main Methods:

    • Development of a physically based theory for ionic currents.
    • Modeling electrical activity in the cortex and extracellular fluid.
    • Analysis of calcium and potassium ion concentration fluctuations.

    Main Results:

    • Identified calcium and potassium ion density fluctuations as key drivers of extracellular potential variations.

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  • Demonstrated that neural activity can induce calcium and potassium resonances, explaining event-related potentials.
  • Linked periodic potential variations to metabolic changes and experimental alpha/beta rhythms.

    • Conclusions:

    • The proposed model provides a physically grounded explanation for observed electrical potentials in the cortex.
    • The theory successfully accounts for both event-related potentials and spontaneous brain rhythms.
    • Effective neural membrane conductance can be derived from ionic theory, aligning with established models.