Back to Search
Start Over
Default mode network connectivity patterns associated with visual processing at different stages of Parkinson's disease.
- Source :
-
Journal of Alzheimer's disease : JAD [J Alzheimers Dis] 2014; Vol. 42 Suppl 3, pp. S217-28. - Publication Year :
- 2014
-
Abstract
- Background: The default mode network (DMN) decreases its activity when switching from a resting state to a cognitive task condition, while activity of the network engaged in the given task increases. Visual processing is typically disturbed in Parkinson's disease dementia (PDD).<br />Objective: Using functional MRI, we studied the DMN effective connectivity patterns in PDD as compared with cognitively normal patients with Parkinson's disease (PD) and healthy controls (HC) when switching from baseline to a visual cognitive task condition.<br />Methods: In all, 14 PDD, 18 PD, and 18 age-matched healthy controls participated in this functional MRI study. We used a psychophysiological interaction analysis with the precuneus (PCu) as a seed. The threshold was set at p(FWE) <0.05.<br />Results: The healthy controls showed greater PCu connectivity with the bilateral middle temporal/middle occipital gyri at baseline than during the task condition. The correlation direction changed from positive to negative. Both PD and PDD showed disturbed DMN connectivity with the brain regions that are involved in bottom-up visual processing. In PD, we also found impaired integration of the areas engaged in the ventral attentional network, which might reflect specific attentional deficits observed during the early course of PD. In mild PDD, we detected increased engagement of areas involved in the dorsal attentional network, which corresponds to increased top-down control in this patient group as compared to the healthy controls.<br />Conclusion: Our results show impaired dynamic interplay between large scale brain networks in PD that spread far beyond the motor system.
- Subjects :
- Aged
Aged, 80 and over
Atrophy etiology
Atrophy pathology
Attention Deficit Disorder with Hyperactivity etiology
Brain Mapping
Case-Control Studies
Cognition Disorders pathology
Female
Humans
Image Processing, Computer-Assisted
Magnetic Resonance Imaging
Male
Middle Aged
Models, Neurological
Neural Pathways blood supply
Neural Pathways pathology
Neuropsychological Tests
Oxygen blood
Parietal Lobe blood supply
Photic Stimulation
Vision Disorders pathology
Cognition Disorders etiology
Parietal Lobe pathology
Parkinson Disease complications
Parkinson Disease pathology
Vision Disorders etiology
Subjects
Details
- Language :
- English
- ISSN :
- 1875-8908
- Volume :
- 42 Suppl 3
- Database :
- MEDLINE
- Journal :
- Journal of Alzheimer's disease : JAD
- Publication Type :
- Academic Journal
- Accession number :
- 25114077
- Full Text :
- https://doi.org/10.3233/JAD-132684