Comparison of Cholinergic Status with Quantitative EEG in Healthy Subjects and Patients Suspected of Dementia

Longitudinal studies using electroencephalography (EEG) and follow-up are rare in dementia studies; however, varying effects on EEG parameters reported from existing studies [1-7]. Probably due to the heterogeneity and different stages of the dementia diseases, and also mixed types of dementia, e.g., Alzheimer’s dementia (AD), vascular dementia (VaD), Lewy body dementia (LBD) studied. Interpreting the EEG measurements is also tricky because the procedures used to collect and analyze data are different. The commonly used EEG parameters have assessed changes in the proportion of different frequency bands, average frequency, EEG power, the ratio of low-frequency activity to global and fluctuations in EEG frequency and coherence.