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Related Experiment Videos

Current source density analysis: methods and application to simultaneously recorded field potentials of the rabbit's

P Rappelsberger, H Pockberger, H Petsche

    Pflugers Archiv : European Journal of Physiology
    |January 1, 1981
    PubMed
    Summary
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    Current source density (CSD) analysis effectively maps rabbit visual cortex activity. Optimal electrode spacing and individual conductivity measurements are crucial for accurate field potential analysis.

    Area of Science:

    • Neuroscience
    • Computational Neuroscience

    Background:

    • Intracortical field potentials provide insights into neural activity.
    • Current Source Density (CSD) analysis is a method to localize neural sources.

    Purpose of the Study:

    • To apply and evaluate Current Source Density (CSD) analysis for simultaneously recorded intracortical field potentials in the rabbit visual cortex.
    • To determine optimal electrode spacing and necessary conductivity measurements for accurate CSD analysis.

    Main Methods:

    • Simultaneous recordings of intracortical field potentials using multielectrodes with 150 or 300 micron spacing.
    • Application of an interpolation procedure to achieve 75 micron spacing for enhanced derivative estimation.
    • One-dimensional CSD analysis applied under specific conditions.

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  • In-situ relative conductivity measurements performed for each experiment.

    • Main Results:

    • A spatial resolution of 150 microns was sufficient for synchronized activities, while 300 microns sufficed for seizure potentials.
    • Interpolation to 75 micron spacing enabled satisfactory estimation of the second derivative of field potentials.
    • Individual vertical conductivity measurements are essential due to significant inter-experiment variability.
    • The influence of varying conductivity and gradients within cortical layers was analyzed.

    Conclusions:

    • CSD analysis is a viable tool for studying rabbit visual cortex activity.
    • Careful selection of electrode spacing and interpolation is necessary for accurate CSD analysis.
    • In-situ conductivity measurements are critical for reliable CSD analysis due to biological variability.