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Use-dependent hemispheric balance.

Laura Avanzino1, Michela Bassolino, Thierry Pozzo

  • 1Department of Experimental Medicine, Section of Human Physiology and Centro Polifunzionale di Scienze Motorie, University of Genoa, 16126 Genoa, Italy.

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PubMed
Summary
This summary is machine-generated.

Immobilizing one hand for 10 hours altered primary motor cortex (M1) excitability and interhemispheric communication. Overuse of the other arm, not just disuse, significantly impacted M1 balance and function.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Brain

Background:

  • Homologous regions of the primary motor cortices (M1s) are interconnected via transcallosal fibers.
  • Interhemispheric communication between M1s is crucial for unimanual hand movement control.
  • M1 excitability and transcallosal interaction are influenced by arm activity levels.

Purpose of the Study:

  • To investigate cortical modifications in primary motor cortices (M1s) due to asymmetric limb use.
  • To examine changes in M1 excitability and transcallosal interactions after limb immobilization.
  • To differentiate the effects of limb disuse versus overuse on M1 function.

Main Methods:

  • Healthy subjects underwent 10-hour right hand immobilization.
  • Two groups were studied: one with a free-moving left arm (G1) and another with restricted left arm movement (G2).
  • Excitability of both M1s and transcallosal interactions were measured.

Main Results:

  • Non-use of the left arm reduced its M1 excitability and decreased inhibitory influence on the right hemisphere in both groups.
  • Increased excitability in the right M1 and enhanced inhibitory interaction onto the left M1 were observed only in G1 (free-moving left arm).
  • These findings indicate that M1 modifications depend on the overuse of the non-immobilized limb.

Conclusions:

  • Cortical plasticity in M1 is strongly influenced by the usage patterns of the limbs.
  • Asymmetric arm activity leads to significant, use-dependent alterations in interhemispheric M1 communication.
  • The balance between the two primary motor cortices is dynamically regulated by limb activity, highlighting the role of overuse in cortical adaptation.