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Related Experiment Video

Updated: Feb 5, 2026

Corticospinal Excitability Modulation During Action Observation
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Static magnetic field stimulation applied over the cervical spinal cord can decrease corticospinal excitability in

Kento Nakagawa1,2, Kimitaka Nakazawa1

  • 1Graduate School of Arts and Sciences, The University of Tokyo, Japan.

Clinical Neurophysiology Practice
|September 15, 2018
PubMed
Summary
This summary is machine-generated.

Transspinal static magnetic field stimulation (tsSMS) reduced corticospinal tract excitability in healthy subjects. This non-invasive method may offer new spinal cord stimulation therapies for conditions involving nerve hyperexcitability.

Keywords:
EMG, electromyographyFDI, first dorsal interosseousM1, primary motor cortexMEP, motor evoked potentialMotor evoked potentialNeuromodulationSpinal cordStatic magnetic fieldTMS, transcranial magnetic stimulationtSMS, transcranial static magnetic stimulationtsSMS, transspinal static magnetic stimulation

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Area of Science:

  • Neuroscience
  • Neuromodulation
  • Spinal Cord Stimulation

Background:

  • Transcranial static magnetic field stimulation modulates cortical excitability.
  • The effects of transspinal static magnetic field stimulation (tsSMS) on corticospinal tract excitability are not well understood.

Purpose of the Study:

  • To investigate the impact of tsSMS on the excitability of the corticospinal tract.

Main Methods:

  • 24 healthy subjects received either tsSMS (0.45 Tesla magnet) or sham stimulation for 15 minutes.
  • Motor evoked potentials (MEPs) were measured from the first digital interosseous muscle using transcranial magnetic stimulation before, during, and after the intervention.

Main Results:

  • tsSMS significantly decreased MEP amplitudes compared to baseline and sham stimulation.
  • These inhibitory effects were observed during the intervention but did not persist after cessation.

Conclusions:

  • Static magnetic field stimulation applied to the spine can decrease corticospinal tract excitability.
  • tsSMS presents a potential non-invasive neuromodulatory tool for spinal cord applications, particularly for conditions with pathological hyperexcitability.