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The ipsilateral human motor cortex can functionally compensate for acute contralateral motor cortex dysfunction.

Lucy H A Strens1, Noa Fogelson, Paul Shanahan

  • 1Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, Queen Square, London WCIN 3BG, United Kingdom.

Current Biology : CB
|July 18, 2003
PubMed
Summary
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The unaffected (ipsilateral) motor cortex can compensate for stroke-related damage to the affected (contralateral) motor cortex. This compensation supports motor recovery and suggests new therapeutic targets.

Area of Science:

  • Neuroscience
  • Motor control
  • Stroke recovery

Background:

  • Stroke often leads to motor deficits due to damage in the primary motor cortex (M1).
  • Functional changes in the unaffected (ipsilateral) M1 after stroke are observed, but their role in recovery is debated.
  • It remains unclear if ipsilateral M1 activity aids motor recovery or is a byproduct of the injury.

Purpose of the Study:

  • To investigate the potential of the ipsilateral M1 to compensate for contralateral M1 dysfunction.
  • To determine if ipsilateral M1 compensation contributes to motor recovery after stroke.

Main Methods:

  • Repetitive transcranial magnetic stimulation (rTMS) was used to acutely disrupt M1 function during a finger-tapping task.
  • Force production was measured before and after rTMS over contralateral M1, ipsilateral M1, or occipital cortex (control).

Related Experiment Videos

  • Simultaneous bilateral M1 stimulation was employed to block potential ipsilateral compensation.

    • Main Results:

    • Disruption of contralateral M1 by rTMS caused a transient decrease in tapping force.
    • Ipsilateral M1 excitability changes coincided with the recovery of tapping force, suggesting delayed compensation.
    • Blocking ipsilateral M1 compensation via bilateral stimulation resulted in prolonged deficits in tapping force.

    Conclusions:

    • This study provides the first evidence that the ipsilateral primary motor cortex can functionally compensate for contralateral M1 damage in adult humans.
    • These findings support the role of ipsilateral M1 in motor recovery after stroke.
    • Targeting unaffected cortical areas may offer a promising strategy for stroke rehabilitation interventions.