Can we predict who is at risk of facing cognitive issues in PD and address them earlier? These are the questions being pursued by Dr. Goldman of the PDF Research Center at Rush University Medical Center.
PDF Grant Programs
Are you interested in furthering Parkinson's science? View PDF's open grant programs.
The default mode network is disrupted in parkinson's disease with visual hallucinations.
PDF's targeted PubMed search provides you with access to journal articles from the last 90 days that may be pertinent to Parkinson's disease research.
Not what you're looking for? Do you need informational publications about Parkinson's targeted for people living with Parkinson's, caregivers and family members? Please browse PDF's educational materials and programs - which are all available electronically or in print. Order for yourself, a loved one or in bulk for your patients or support group.
Hum Brain Mapp 2014 Jul;
Authors: Nailin Yao, Richard Shek-Kwan Chang, Charlton Cheung, Shirley Pang, Kui Kai Lau, John Suckling, James Rowe, Kevin Yu, Henry Ka-Fung Mak, Siew-Eng Chua, Shu Leong Ho, Grainne M McAlonan
Background: Visual hallucinations (VH) are one of the most striking nonmotor symptoms in Parkinson's disease (PD), and predict dementia and mortality. Aberrant default mode network (DMN) is associated with other psychoses. Here, we tested the hypothesis that DMN dysfunction contributes to VH in PD. Methods: Resting state functional data was acquired from individuals with PD with VH (PDVH) and without VH (PDnonVH), matched for levodopa drug equivalent dose, and a healthy control group (HC). Independent component analysis was used to investigate group differences in functional connectivity within the DMN. In addition, we investigated whether the functional changes associated with hallucinations were accompanied by differences in cortical thickness. Results: There were no group differences in cortical thickness but functional coactivation within components of the DMN was significantly lower in both PDVH and PDnonVH groups compared to HC. Functional coactivation within the DMN was found to be greater in PDVH group relative to PDnonVH group. Conclusion: Our study demonstrates, for the first time that, within a functionally abnormal DMN in PD, relatively higher "connectivity" is associated with VH. We postulate that aberrant connectivity in a large scale network affects sensory information processing and perception, and contributes to "positive" symptom generation in PD. Hum Brain Mapp, 2014. © 2014 Wiley Periodicals, Inc.
PMID: 24985056 [PubMed - as supplied by publisher]