Role of hyperactive cerebellum and motor cortex in Parkinson's disease.

Role of hyperactive cerebellum and motor cortex in Parkinson's disease. Research Abstract Details 

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Role of hyperactive cerebellum and motor cortex in Parkinson's disease. Abstract Text:

Hong Yu,Dagmar Sternad,Daniel M Corcos,David E Vaillancourt,

Previous neuroimaging studies have found hyperactivation in the cerebellum and motor cortex and hypoactivation in the basal ganglia in patients with Parkinson's disease (PD) but the relationship between the two has not been established. This study examined whether cerebellar and motor cortex hyperactivation is a compensatory mechanism for hypoactivation in the basal ganglia or is a pathophysiological response that is related to the signs of the disease. Using a BOLD contrast fMRI paradigm PD patients and healthy controls performed automatic and cognitively controlled thumb pressing movements. Regions of interest analysis quantified the BOLD activation in motor areas, and correlations between the hyperactive and hypoactive regions were performed, along with correlations between the severity of upper limb rigidity and BOLD activation. There were three main findings. First, the putamen, supplementary motor area (SMA) and pre-SMA were hypoactive in PD patients. The left and right cerebellum and the contralateral motor cortex were hyperactive in PD patients. Second, PD patients had a significant negative correlation between the BOLD activation in the ipsilateral cerebellum and the contralateral putamen. The correlation between the putamen and motor cortex was not significant. Third, the BOLD activation in the motor cortex was positively correlated with the severity of upper limb rigidity, but the BOLD activation in the cerebellum was not correlated with rigidity. Further, the activation in the motor cortex was not correlated with upper extremity bradykinesia. These findings provide new evidence supporting the hypothesis that hyperactivation in the ipsilateral cerebellum is a compensatory mechanism for the defective basal ganglia. Our findings also provide the first evidence from neuroimaging that hyperactivation in the contralateral primary motor cortex is not a compensatory response but is directly related to upper limb rigidity.

Role of hyperactive cerebellum and motor cortex in Parkinson's disease. Publishing Authors By Initials

H Yu,D Sternad,DM Corcos,DE Vaillancourt,

For similar tremor research abstracts see: tremor research

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Role of hyperactive cerebellum and motor cortex in Parkinson's disease. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: NeuroImage

VOLUME: 35

Page Numbers: 222-33

Journal Abbreviation: Neuroimage

ISSN: 1053-8119

DAY: 12

MONTH: 01

YEAR: 2007

Role of hyperactive cerebellum and motor cortex in Parkinson's disease. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9215515

Role of hyperactive cerebellum and motor cortex in Parkinson's disease. Keywords Mesh Terms:

KEYWORDS: Tremor

MESH TERMS: physiopathology

Chemical & Substance for Abstract: Role of hyperactive cerebellum and motor cortex in Parkinson's disease. Information

Substance Name: Oxygen

Registry Number: 7782-44-7

Grant and Affiliation Information for Role of hyperactive cerebellum and motor cortex in Parkinson's disease.

AFFILIATION: Department of Movement Sciences, University of Illinois at Chicago, Chicago, IL 60612, USA.

Country: United States

AGENCY: United States NINDS

GRANT: R01-NS-52318

ACRONYM: NS

MEDLINETA: Neuroimage

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