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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

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Corticospinal Excitability Modulation During Action Observation
12:33

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Published on: December 31, 2013

Primary motor cortex excitability is modulated with bimanual training.

Jason L Neva1, Wynn Legon, W Richard Staines

  • 1Dept. of Kinesiology, Univ. of Waterloo, Waterloo, ON, Canada. jlneva@uwaterloo.ca

Neuroscience Letters
|March 13, 2012
PubMed
Summary

Bimanual in-phase movement training expanded the primary motor cortex (M1) representation of wrist muscles. This neuroplasticity suggests simultaneous homologous muscle activation enhances M1 spatial extent, not amplitude.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Motor Learning

Background:

  • Bimanual visuomotor movement can enhance motor cortical activity in both brain hemispheres.
  • Adaptations may be specific to motor preparatory areas or involve primary motor cortex (M1).

Purpose of the Study:

  • Investigate changes in primary motor cortex (M1) representation of wrist muscles after bimanual movement training.
  • Compare effects of in-phase, anti-phase, and prepared movements on M1.

Main Methods:

  • Recorded motor evoked potentials (MEPs) for the extensor carpi radialis (ECR) muscle.
  • Analyzed spatial extent and amplitude of ECR cortical representation before and after training.
  • Used two experiments with distinct bimanual training types: in-phase (with/without preparation) and anti-phase (with preparation).

Main Results:

  • In-phase bimanual movement training significantly enhanced the spatial representation of the ECR muscle in M1.
  • No significant difference in MEP amplitude was observed in the cortical area.
  • Anti-phase training effects were not detailed in the provided abstract.

Conclusions:

  • Simultaneous activation of homologous M1 representations during in-phase movements may drive increased plasticity.
  • Enhanced plasticity manifests as an increased spatial extent of the trained muscle representation in M1.
  • This suggests M1 spatial expansion is a key adaptation to specific bimanual training paradigms.