Abstract
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.
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This research was supported in part by the Ministerio de Ciencia e Innovación (Spain) under projects TEC2008-02241 and TEC2011-22987, the Dutch Parkinson Foundation (Parkinson Patiënten Vereniging), and the Dutch Foundation for Brain Research (Nederlandse Hersenstichting, grant no. 11F03(2)05). The authors wish to thank Diederick Stoffers for collecting the dataset used in this study.
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Associate Editor Leonidas D. Iasemidis oversaw the review of this article.
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Gómez, C., Olde Dubbelink, K.T.E., Stam, C.J. et al. Complexity Analysis of Resting-State MEG Activity in Early-Stage Parkinson’s Disease Patients. Ann Biomed Eng 39, 2935–2944 (2011). https://doi.org/10.1007/s10439-011-0416-0
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DOI: https://doi.org/10.1007/s10439-011-0416-0