A paradox: After stroke, the non-lesioned lower limb motor cortex may be maladaptive

Sangeetha Madhavan*, Lynn M. Rogers, James W. Stinear

*Corresponding author for this work

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

What are the neuroplastic mechanisms that allow some stroke patients to regain high-quality control of their paretic leg, when others do not? One theory implicates ipsilateral corticospinal pathways projecting from the non-lesioned hemisphere. We devised a new transcranial magnetic stimulation protocol to identify ipsilateral corticospinal tract conductivity from the non-lesioned hemisphere to the paretic limb in chronic stroke patients. We also assessed corticospinal tract degeneration by diffusion tensor imaging, and used an ankle tracking task to assess lower limb motor control. We found greater tracking error during antiphase bilateral ankle movement for patients with strong conductivity from the non-lesioned hemisphere to the paretic ankle than for those with weak or no conductivity. These findings suggest that, instead of assisting motor control, contributions to lower limb motor control from the non-lesioned hemisphere of some stroke survivors may be maladaptive.

Original languageEnglish (US)
Pages (from-to)1032-1039
Number of pages8
JournalEuropean Journal of Neuroscience
Volume32
Issue number6
DOIs
StatePublished - Sep 2010

Keywords

  • DTI
  • TMS
  • lower extremity
  • neuroplasticity
  • stroke

ASJC Scopus subject areas

  • Neuroscience(all)

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