title: Static magnetic field can transiently alter the human intracortical inhibitory system.
abstract: OBJECTIVE
  Although recent studies have shown the suppressive effects of static magnetic fields (SMFs) on the human primary motor cortex (M1) possibly due to the deformed neural membrane channels, the effect of the clinical MRI scanner bore has not been studied in the same way.
  
  
  METHODS
  We tested whether the MRI scanner itself and compact magnet can alter the M1 function using single- and paired-pulse transcranial magnetic stimulation (TMS).
  
  
  RESULTS
  We found the transient suppression of the corticospinal pathway in both interventions. In addition, the transient enhancement of the short-latency intracortical inhibition (SICI) was observed immediately after compact magnet stimulation.
  
  
  CONCLUSIONS
  The present results suggest that not only the inhomogeneous SMFs induced by a compact magnet but also the homogeneous SMF produced by the MRI scanner bore itself can produce the transient cortical functional change.
  
  
  CONCLUSIONS
  Static magnetic stimulation can modulate the intracortical inhibitory circuit of M1, which might be useful for clinical purposes.
authors: Department of Physical Therapy, Nagoya University Graduate School of Medicine, Nagoya, Japan.
authors: Ippei
authors: I
authors: Nojima
authors: Human Brain Research Center, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors: Satoko
authors: S
authors: Koganemaru
authors: Human Brain Research Center, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors: Hidenao
authors: H
authors: Fukuyama
authors: Human Brain Research Center, Kyoto University Graduate School of Medicine, Kyoto, Japan. Electronic address: mima@kuhp.kyoto-u.ac.jp.
authors: Tatsuya
authors: T
authors: Mima
mesh_terms: D000328:Adult; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D009433:Neural Inhibition / Q000502:physiology*; D050781:Transcranial Magnetic Stimulation / Q000379:methods*; D055815:Young Adult
keywords: Magnetic resonance imaging; Short intracortical inhibition; Static magnetic field; Transcranial magnetic stimulation