Effects of transcranial magnetic stimulation on EEG activity

Keiji Iramina, Takashi Maeno, Yasuyuki Kowatari, Shoogo Ueno

Research output: Contribution to journalConference articlepeer-review

33 Citations (Scopus)


The combination of transcranial magnetic stimula tion (TMS) and electroencephalogram (EEG) is an effective tool for investigating the functional connectivity in the brain. This paper investigated cortical reactivity and connectivity by the combination of TMS and EEG. Spontaneous activity of the brain was measured before and after magnetic stimulation. The effect of TMS on alpha activity was investigated. The alpha wave was suppressed for a few seconds after stimulation of the occipital area. No differences in the suppression of the alpha waves were found with and without auditory masking. Furthermore, the coil click of TMS had no effect on the alpha wave. The alpha wave was significantly suppressed by the occipital stimulation, whereas slight suppression was observed in other areas of stimulation. The alpha wave was increasingly suppressed as the stimulation magnitude became more intense. In order to investigate the evoked response by TMS, evoked potentials generated by TMS were measured. It was observed that more evoked responses spread to the center of the brain when the cerebellum was stimulated than at other areas of stimulation. These results indicated that TMS blocked the neural connections within alpha wave generation, and the electrical currents produced by TMS affected the neural activities.

Original languageEnglish
Pages (from-to)3347-3349
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - Sept 2002
Externally publishedYes
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: Apr 28 2002May 2 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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