Cognitive impairments in early Parkinson's disease are accompanied by reductions in activity in frontostriatal neural circuitry

Simon J. G. Lewis, Anja Dove, Trevor W. Robbins, Roger A. Barker, Adrian M. Owen

Research output: Contribution to journalArticlepeer-review

Abstract

Studies in patients with Parkinson's disease (PD) suggest that the characteristic motor symptoms of the disorder are frequently accompanied by impairments in cognition that are most profound in tasks of executive function. Neuropsychological deficits are not an inevitable consequence of the disease, yet the reasons underlying cognitive heterogeneity in PD are not well understood. To determine the underlying neural correlate of these cognitive deficits, we used event-related functional magnetic resonance imaging (fMRI) to compare groups of cognitively impaired and unimpaired patients, matched on all other clinical measures. fMRI revealed significant signal intensity reductions during a working-memory paradigm in specific striatal and frontal lobe sites in patients with cognitive impairment compared with those patients who were not cognitively unimpaired. These results demonstrate that cognitive deficits in PD are accompanied by neural changes that are related to, but distinct from, those changes that underlie motoric deficits in these patients. Furthermore, they suggest that fMRI may provide a valuable tool for identifying patients who may benefit from targeted therapeutic strategies.

Original languageEnglish
Pages (from-to)6351-6356
Number of pages6
JournalThe Journal of Neuroscience
Volume23
Issue number15
DOIs
Publication statusPublished - 16 Jul 2003
Externally publishedYes

Keywords

  • Parkinson’s disease
  • working memory
  • functional MRI
  • heterogeneity
  • frontal lobes
  • basal ganglia

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