Functional cortical source connectivity of resting state electroencephalographic alpha rhythms shows similar abnormalities in patients with mild cognitive impairment due to Alzheimer’s and Parkinson’s diseases

About 50-70% of 46 million of cases of dementia worldwide are due to Alzheimer's (ADD) and Parkinson's (PDD) neurodegenerative diseases across aging (Prince et al., 2015). ADD typically presents a major amnesic syndrome and minor linguistic, visuospatial, and visual disease variants (Dubois et al., 2014). PDD manifest attentional, verbal, and executive cognitive deficits in association with motor manifestations such as akinesia, tremor, postural instability, and rigidity (Aarsland et al., 2003; Buter et al., 2008; Dubois and Pillon, 1996; Emre et al., 2007; Huber et al., 1989; Hughes et al., 2000; Levy et al., 2000; Walker et al., 2015; Wolters, 2001).

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