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Related Experiment Videos

Corticocortical inhibition in human motor cortex

T Kujirai1, M D Caramia, J C Rothwell

  • 1MRC Human Movement and Balance Unit, Institute of Neurology, London.

The Journal of Physiology
|November 1, 1993
PubMed
Summary

Transcranial magnetic stimulation can suppress motor cortex responses. This suppression, observed at short intervals, suggests cortical, not spinal, mechanisms are involved in modulating motor cortex excitability.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cortical Excitability

Background:

  • Transcranial magnetic stimulation (TMS) is a non-invasive technique used to study brain function.
  • Understanding the mechanisms of cortical excitability modulation is crucial for developing new therapeutic strategies.

Purpose of the Study:

  • To investigate the effects of conditioning transcranial magnetic or electric stimuli on motor cortex excitability.
  • To determine the influence of stimulus location, intensity, and timing on response suppression and facilitation.

Main Methods:

  • Subthreshold conditioning TMS or electric stimuli were applied to the motor cortex of ten healthy volunteers.
  • Responses in the first dorsal interosseous (FDI) muscle were evoked by suprathreshold test stimuli.
  • Conditioning stimulus location and intensity were systematically varied.

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Main Results:

  • A magnetic conditioning stimulus over the hand area suppressed FDI responses at 1-6 ms interstimulus intervals, with facilitation at 10-15 ms.
  • Stimulation anterior or posterior to the motor strip reduced suppression; vertex stimulation showed comparable suppression.
  • Suppression was more effective with smaller test responses and weak conditioning stimuli (0.7-0.9 motor threshold).
  • Evidence suggested cortical, not spinal, mechanisms, as conditioning stimuli did not affect muscle responses to electric test shocks or H-reflexes.

Conclusions:

  • Cortical mechanisms, not spinal, are primarily responsible for TMS-induced suppression of motor cortex responses.
  • The location and intensity of conditioning stimuli significantly impact the modulation of motor cortex excitability.
  • These findings contribute to understanding non-invasive brain stimulation effects on motor control.