Transcranial magnetic stimulation-induced changes in EEG and responses recorded from the scalp of healthy humans

Shin Ichi Izumi, Moriichiro Takase, Motohide Arita, Yoshihisa Masakado, Akio Kimura, Naoichi Chino

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We determined the changes and responses in the electroencephalogram (EEG) induced by transcranial magnetic stimulation (TMS) of the scalp of five healthy men. The center of a circular coil was positioned at the vertex, and 80 stimulations were administered clockwise with the maximum output of electric current. To reduce stimulus artifacts, we created a circuit that blocked the input for 150 ms after stimulation. EEGs were recorded from F3,4, C3,4, P3,4, and T3,4. The following results were obtained: (1) slowing of the EEG was observed immediately (150 m) after each stimulation. The incidence of changes ranged from 25-80%; their duration ranged from 200-600 ms. (2) Electroencephalographic responses in the averaged form appeared as gentle positive waves. In some subjects and leads, 1 to 3 negative peaks were fused. The methods used in the present study may be useful in evaluating the sensitivity to TMS of patients with stroke and other types of brain injury.

Original languageEnglish
Pages (from-to)319-322
Number of pages4
JournalElectroencephalography and Clinical Neurophysiology
Volume103
Issue number2
DOIs
Publication statusPublished - 1997 Aug 1
Externally publishedYes

Keywords

  • Artifact-interrupting circuit
  • Electroencephalography
  • Evoked potentials
  • Healthy humans
  • Safety
  • Transcranial magnetic stimulation

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology

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