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Related Experiment Videos

[Somatosensory evoked potentials/fields--exploration of brain function].

Ken Inoue1, Takushi Shirai, Toshihide Harada

  • 1Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima 732-8551.

Rinsho Byori. the Japanese Journal of Clinical Pathology
|February 19, 2004
PubMed
Summary
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Electroencephalography (EEG) and magnetoencephalography (MEG) track brain activity. This study details somatosensory evoked potentials (SEPs) and fields (SEFs), discussing their origins and a recent MEG investigation.

Area of Science:

  • Neuroscience
  • Electrophysiology

Context:

  • The history of electroencephalography (EEG) dates back to 1875.
  • Somatosensory evoked potentials (SEPs) were first recorded in 1951 and later developed for clinical use.
  • Understanding evoked potentials requires examining mechanisms like far-field potentials (FFPs).

Purpose:

  • To review the history and mechanisms of electroencephalography (EEG) and somatosensory evoked potentials (SEPs).
  • To discuss the principles of magnetoencephalography (MEG) and its application in studying somatosensory evoked fields (SEFs).
  • To present findings from a recent study on SEFs elicited by tactile stimulation.

Summary:

  • SEPs, including components like P9, N9, and N20, originate from various neural structures from the brachial plexus to the brainstem.

Related Experiment Videos

  • Magnetoencephalography (MEG) detects magnetic signals primarily from tangential cortical currents.
  • A study demonstrated SEFs with tangentially oriented dipoles from the frontal to parietal lobes using MEG.

    • Impact:

    • Provides a historical overview of EEG and SEPs.
    • Elucidates the neural origins of different SEP components.
    • Highlights the utility of MEG in mapping cortical activity, specifically SEFs.