Impairment of brain functions in Parkinson’s disease reflected by alterations in neural connectivity in EEG studies: a viewpoint

Parkinson's disease (PD) is characterized mainly by motor symptoms of tremor, rigidity, bradykinesia, and postural instability (Aarsland et al. 2011) and is accompanied by several non-motor symptoms. The phenotype of the disease varies among patients. The speed progression is very individual, as is the representation of motor and non-motor symptoms (Eggers et al. 2012). Cognitive impairment and dementia are common in advanced PD. Severe cognitive impairment increases disability and mortality in advanced PD.

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