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Related Experiment Video

Updated: May 7, 2026

Online Transcranial Magnetic Stimulation Protocol for Measuring Cortical Physiology Associated with Response Inhibition
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Determining optimal rTMS parameters through changes in cortical inhibition.

Danilo R de Jesus1, Gabriela Pereira de Souza Favalli1, Sylco S Hoppenbrouwers2

  • 1Centre for Addiction and Mental Health, University of Toronto, Toronto, Ontario, Canada.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|October 15, 2013
PubMed
Summary
This summary is machine-generated.

High-frequency repetitive transcranial magnetic stimulation (rTMS) potentiated cortical inhibition (CI) only with a high dose of 6000 pulses. Longer treatment durations are necessary for significant changes in cortical inhibition.

Keywords:
Cortical excitabilityCortical inhibitionGABAMotor cortexRepetitive transcranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Neuromodulation
  • Cognitive Science

Background:

  • Repetitive transcranial magnetic stimulation (rTMS) is known to alter cortical inhibition and excitability.
  • These alterations may correlate with the therapeutic outcomes of rTMS treatments.
  • Understanding the dose-dependent effects of rTMS is crucial for optimizing its clinical application.

Purpose of the Study:

  • To investigate how different durations or doses of rTMS impact cortical inhibition and excitability in healthy individuals.
  • To determine the specific parameters of rTMS that lead to significant changes in cortical inhibition.

Main Methods:

  • Four experimental conditions were employed, varying the number of pulses (1200, 3600, 6000) and frequency (1 Hz or 20 Hz) of active or sham rTMS.
  • Cortical inhibition and excitability were assessed using measures such as short-interval intracortical inhibition, long-interval cortical inhibition, cortical silent period (CSP), motor evoked potential amplitude, resting motor threshold, and intracortical facilitation.

Main Results:

  • A significant lengthening of the cortical silent period (CSP), indicating potentiation of cortical inhibition, was observed exclusively with 6000 pulses of 20 Hz rTMS.
  • No significant changes in cortical excitability measures were detected across the different rTMS protocols.

Conclusions:

  • High-frequency (20 Hz) rTMS, delivered at a high dose (6000 pulses), is effective in potentiating cortical inhibition.
  • Extended treatment durations, specifically a higher number of pulses per session, are required to induce significant changes in cortical inhibition.
  • CSP lengthening could potentially serve as a biomarker to guide rTMS treatment response.