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Related Experiment Videos

On the relation between somatic evoked potentials and fields

L Kaufman, Y Okada, D Brenner

    The International Journal of Neuroscience
    |January 1, 1981
    PubMed
    Summary

    The somatic evoked field (SEF) measured at the scalp provides information similar to direct brain recordings. This magnetic field originates in the cerebral cortex near the central sulcus, offering new insights into neural activity.

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    Area of Science:

    • Neuroscience
    • Biophysics
    • Evoked Potentials and Fields

    Background:

    • Electrical stimulation of the median nerve can evoke measurable magnetic fields in the brain (somatic evoked field, SEF).
    • The SEF waveform resembles brain surface potentials (SPR) but differs from scalp potentials (SEP).
    • Understanding the sources of SEF is crucial for interpreting neural activity.

    Purpose of the Study:

    • To provide a detailed account of the somatic evoked field (SEF).
    • To analyze the relationship between SEF, somatic evoked potential (SEP), and somatic pial response (SPR).
    • To clarify the nature and location of SEF sources using these three measures.

    Main Methods:

    • Review of basic principles and models for localizing sources of evoked potentials and fields.

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  • Experimental determination of how SEF varies with recording position on the scalp.
  • Analysis of current types that may generate SEF and distinguish them from SEP-generating currents.

    • Main Results:

    • SEF recorded normally to the head yields information comparable to SPR from exposed brain surfaces.
    • The SEF originates in the cerebral cortex near the central sulcus.
    • Identifiable SEF components arise from intracellular currents, opposite in direction to extracellular currents generating SPR.

    Conclusions:

    • SEF measurements offer a non-invasive method to study cortical activity similar to direct brain recordings.
    • The SEF originates from specific cortical regions, aiding in the localization of neural sources.
    • Distinguishing between intracellular and extracellular currents provides a deeper understanding of evoked potentials and fields.