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Related Experiment Videos

Transient motor evoked potential suppression following a complex sensorimotor task.

M N McDonnell1, M C Ridding

  • 1Research Centre for Human Movement Control, School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, SA 5005, Australia.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|April 8, 2006
PubMed
Summary

Repeated sensorimotor training transiently suppressed corticospinal excitability, but not spinal or peripheral measures. This suggests other intracortical circuits are involved in motor task adaptation.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Repeated motor tasks can modulate motor cortical excitability.
  • Understanding these modulations is key to rehabilitation and skill acquisition.

Purpose of the Study:

  • Investigate the mechanism of transient suppression of transcranial magnetic stimulation (TMS) response after sensorimotor training (ST).
  • Examine the effects of ST on corticospinal excitability, intracortical excitability, spinal excitability, and grip force.

Main Methods:

  • 19 healthy subjects performed the grooved pegboard test (GPT) in four experiments.
  • Assessed corticospinal excitability via motor evoked potential (MEP) amplitude.
  • Evaluated intracortical inhibition/facilitation and spinal excitability (M and F waves).

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Main Results:

  • MEP amplitude significantly decreased post-ST, correlating with improved GPT performance time.
  • No significant changes were observed in intracortical inhibition/facilitation.
  • Spinal excitability measures (M wave, F wave) and grip force remained unchanged, ruling out peripheral fatigue.

Conclusions:

  • Corticospinal excitability reduction was transient (<10 min) and not linked to spinal or peripheral changes.
  • The findings suggest involvement of other intracortical circuits in the transient suppression.
  • Motor task-induced excitability changes are complex and task-dependent.