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Related Experiment Video

Updated: Jun 16, 2026

The Use of Magnetic Resonance Spectroscopy as a Tool for the Measurement of Bi-hemispheric Transcranial Electric Stimulation Effects on Primary Motor Cortex Metabolism
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Interhemispheric modulation induced by cortical stimulation and motor training.

Julie A Williams1, Alvaro Pascual-Leone, Felipe Fregni

  • 1Department of Neurology, Harvard Medical School, Boston, Massachusetts 02215, USA.

Physical Therapy
|January 30, 2010
PubMed
Summary
This summary is machine-generated.

Transcranial direct current stimulation (tDCS) combined with motor training improved motor performance in healthy individuals. This enhancement was linked to decreased transcallosal inhibition (TCI) from the dominant to the nondominant hemisphere.

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Published on: February 23, 2020

Area of Science:

  • Neuroscience
  • Motor Control
  • Rehabilitation

Background:

  • Interhemispheric inhibition is a crucial cortico-cortical interaction.
  • Dysfunctional interhemispheric inhibition is observed in neurological disorders.
  • Transcranial direct current stimulation (tDCS) modulates interhemispheric interactions and improves motor function.

Purpose of the Study:

  • To investigate the effects of tDCS combined with unilateral motor training and contralateral hand restraint.
  • To assess the impact on interhemispheric inhibition between dominant and nondominant hemispheres.
  • To evaluate changes in motor performance in healthy participants.

Main Methods:

  • Double-blind, prospective, single-center study.
  • Twenty healthy participants randomly assigned to active or sham tDCS.
  • Bilateral primary motor cortex (M1) stimulation combined with unilateral motor training and contralateral hand restraint.
  • Assessment of motor function, cortical excitability, and transcallosal inhibition (TCI).

Main Results:

  • Active tDCS group showed greater improvement in nondominant hand motor performance compared to sham.
  • Active tDCS group exhibited decreased cortical excitability in the dominant hemisphere and reduced TCI from dominant to nondominant hemisphere.
  • The reduction in TCI correlated with motor performance gains in the nondominant hand.

Conclusions:

  • tDCS enhances motor training effects, particularly with contralateral hand restraint.
  • The benefits are associated with bihemispheric modulation, specifically decreased TCI from dominant to nondominant hemisphere.
  • tDCS shows potential as an adjunct therapy to enhance motor rehabilitation, similar to constraint-induced movement therapy.