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Cortical plasticity during three-week motor skill learning.

Petr Hlustík1, Ana Solodkin, Douglas C Noll

  • 1Department of Neurology, University of Maryland, Baltimore, Maryland, USA. phlustik@upol.cz

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|September 18, 2004
PubMed
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Practicing hand movements, even simple ones, expands brain areas for movement control. This skill acquisition improves both specific tasks and general hand performance, showing brain plasticity.

Area of Science:

  • Neuroscience
  • Motor Control
  • Neuroplasticity

Background:

  • Motor skill acquisition involves changes in both behavior and neural representations.
  • The primary motor (M1) and somatosensory (S1) cortices are crucial for motor control and learning.
  • Understanding how practice affects these cortical areas is key to understanding motor adaptation.

Purpose of the Study:

  • To investigate the effects of hand motor skill acquisition on motor behavior.
  • To examine the changes in primary motor (M1) and somatosensory (S1) cortical representations during skill learning.
  • To determine if specific practice leads to specific neural changes and if general improvements occur.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity during hand movements.

Related Experiment Videos

  • Subjects underwent four fMRI sessions over 3 weeks, performing simple finger/wrist movements and a sequential finger task.
  • Two groups were compared: one practicing a fine motor sequence, the other a gross motor task (sponge squeezing).

    • Main Results:

    • Motor performance improved gradually in both practiced and unpracticed tasks for both groups.
    • Active areas in M1 and S1 expanded with practice, encompassing both practiced and unpracticed movements.
    • Increased cortical overlap and sharing were observed, particularly in the fine-skill group, while preserving somatotopy.

    Conclusions:

    • Even limited practice of a complex hand task induces specific and nonspecific behavioral improvements.
    • Motor skill acquisition leads to expansion of M1 and S1 movement representations.
    • The extent of active M1 and S1 correlates with motor performance, reflecting an individual's current motor ability.