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Vicarious function within the human primary motor cortex? A longitudinal fMRI stroke study.

Assia Jaillard1, Chantal Delon Martin, Katia Garambois

  • 1Département de Neurologie-Unité Neuro-vasculaire, Centre Hospitalier Universitaire de Grenoble, BP 217-38043 Grenoble Cedex 9, France

Brain : a Journal of Neurology
|February 25, 2005
PubMed
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This study shows that after a primary motor cortex (M1) stroke, the brain can reorganize motor functions. Recovery involves adjacent motor cortex areas taking over, particularly in the dorsal M1 region for finger movements.

Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Motor Control

Background:

  • Experimental monkey studies suggest adjacent motor cortex reorganization after hand motor cortex lesions.
  • Human functional MRI (fMRI) studies on isolated primary motor cortex (M1) stroke recovery patterns are limited.
  • Motor recovery is time-dependent and task-specific, influencing observed brain activity.

Purpose of the Study:

  • To investigate if recovery after isolated M1 stroke in humans involves reorganization in the surrounding motor cortex.
  • To examine the time course and task-specific nature of motor reorganization following M1 stroke.
  • To compare human fMRI findings with animal experimental data on motor recovery after M1 lesions.

Main Methods:

  • A longitudinal fMRI study involving four patients with isolated M1 ischemic stroke and four age/sex-matched healthy controls.

Related Experiment Videos

  • Three fMRI sessions were conducted: <20 days, 4 months, and 2 years post-stroke.
  • Two motor tasks, finger tapping (FT) and finger extension (FE), were used to assess motor activation patterns.

    • Main Results:

    • Initially, FT activation was ipsilateral and FE activation was contralateral; both involved bilateral cerebellum.
    • From 4 months, recovery correlated with activation in contralateral dorsal premotor/sensorimotor cortex and ipsilateral cerebellum.
    • Patients showed a dorsal shift in M1 activation for both tasks over 2 years, indicating reorganization in adjacent motor cortex areas.

    Conclusions:

    • Human M1 stroke recovery involves functional reorganization in adjacent motor cortex, consistent with 'vicariation' models.
    • Distinct finger motor representations (FT vs. FE) within M1 may undergo differential reorganization.
    • The study provides the first human fMRI evidence of M1 reorganization post-stroke, mirroring animal experimental findings.