Complexity Analysis of Resting-State MEG Activity in Early-Stage Parkinson's Disease Patients.
Gómez, C, Olde Dubbelink, KT, Stam, CJ, Abásolo, D, Berendse, HW and Hornero, R (2011) Complexity Analysis of Resting-State MEG Activity in Early-Stage Parkinson's Disease Patients. Ann Biomed Eng, 39 (12). 2935 - 2944. ISSN 0090-6964
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Official URL: http://dx.doi.org/10.1007/s10439-011-0416-0
The aim of the present study was to analyze resting-state brain activity in patients with Parkinson's disease (PD), a degenerative disorder of the nervous system. Magnetoencephalography (MEG) signals were recorded with a 151-channel whole-head radial gradiometer MEG system in 18 early-stage untreated PD patients and 20 age-matched control subjects. Artifact-free epochs of 4 s (1250 samples) were analyzed with Lempel-Ziv complexity (LZC), applying two- and three-symbol sequence conversion methods. The results showed that MEG signals from PD patients are less complex than control subjects' recordings. We found significant group differences (p-values <0.01) for the 10 major cortical areas analyzed (e.g., bilateral frontal, central, temporal, parietal, and occipital regions). In addition, using receiver-operating characteristic curves with a leave-one-out cross-validation procedure, a classification accuracy of 81.58% was obtained. In order to investigate the best combination of LZC results for classification purposes, a forward stepwise linear discriminant analysis with leave-one out cross-validation was employed. LZC results (three-symbol sequence conversion) from right parietal and temporal brain regions were automatically selected by the model. With this procedure, an accuracy of 84.21% (77.78% sensitivity, 90.0% specificity) was achieved. Our findings demonstrate the usefulness of LZC to detect an abnormal type of dynamics associated with PD.
|Additional Information:||The original publication is available at http://www.springerlink.com|
|Divisions:||Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences|
|Deposited By:||Symplectic Elements|
|Deposited On:||16 Dec 2011 09:59|
|Last Modified:||13 Apr 2013 14:50|
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