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Memory formation in the motor cortex ipsilateral to a training hand.

J Duque1, R Mazzocchio, K Stefan

  • 1Human Cortical Physiology Section and Stroke Neurorehabilitation Clinic, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20817, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|October 12, 2007
PubMed
Summary

Unilateral hand practice strengthens motor cortex (M1) representations in the trained hand but weakens them in the opposite hand. This suggests bilateral motor networks are crucial for learning new motor skills.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Neuroplasticity

Background:

  • Cortical reorganization in the primary motor cortex (M1) contralateral to hand practice is well-documented.
  • The role of the ipsilateral M1 in motor learning remains largely unexplored.

Purpose of the Study:

  • To investigate the influence of unilateral hand practice on the ipsilateral and contralateral M1 organization.
  • To understand the involvement of bilateral motor networks in motor skill acquisition.

Main Methods:

  • Healthy subjects performed unilateral index finger abduction practice.
  • Single-pulse transcranial magnetic stimulation (TMS) assessed M1 activity before and after practice.
  • Motor-evoked potentials (MEPs) and TMS-evoked movements in the first dorsal interosseous (FDI) muscle were analyzed.

Main Results:

  • Practice enhanced TMS-evoked movements and MEP amplitudes in the practicing hand's M1.
  • Conversely, practice decreased TMS-evoked movements and MEP amplitudes in the resting hand's M1.
  • The weakening effect in the ipsilateral M1 was proportional to the strengthening in the contralateral M1.

Conclusions:

  • Unilateral hand practice induces specific changes in both contralateral and ipsilateral M1.
  • These findings highlight the significant role of interacting bilateral motor networks in motor memory formation and skill acquisition.