Multi-task functional MRI in multiple sclerosis patients without clinical disability

René A. Colorado, Karan Shukla, Yuxiang Zhou, Jerry S. Wolinsky, Ponnada A. Narayana

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

While the majority of individuals with multiple sclerosis (MS) develop significant clinical disability, a subset experiences a disease course with minimal impairment even in the presence of significant apparent tissue damage on magnetic resonance imaging (MRI). Functional magnetic resonance imaging (fMRI) in MS patients with low disability suggests that increased use of the cognitive control system may limit the clinical manifestation of the disease. The current fMRI studies tested the hypothesis that nondisabled MS patients show increased recruitment of cognitive control regions while performing sensory, motor and cognitive tasks. Twenty two patients with relapsing-remitting MS and an Expanded Disability Status Scale (EDSS) score of ≤ 1.5 and 23 matched healthy controls were recruited. Subjects underwent fMRI while observing flashing checkerboards, performing right or left hand movements, or executing the 2-back working memory task. Compared to control subjects, patients demonstrated increased activation of the right dorsolateral prefrontal cortex and anterior cingulate cortex during the performance of the working memory task. This pattern of functional recruitment also was observed during the performance of non-dominant hand movements. These results support the mounting evidence of increased functional recruitment of cognitive control regions in the working memory system of MS patients with low disability and provide new evidence for the role of increased cognitive control recruitment in the motor system.

Original languageEnglish (US)
Pages (from-to)573-581
Number of pages9
JournalNeuroImage
Volume59
Issue number1
DOIs
StatePublished - Jan 2 2012

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Keywords

  • Anterior cingulate cortex
  • Cognitive control
  • Cortical reorganization
  • Dorsolateral prefrontal cortex
  • Functional magnetic resonance imaging
  • Multiple sclerosis

ASJC Scopus subject areas

  • Neurology
  • Cognitive Neuroscience

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