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The mean dominant frequency (DF) in the theta-alpha (4–13.75 Hz), alpha (8–13.75 Hz) and theta (4–7.75 Hz) frequency ranges, for each of four diagnostic groups: healthy controls (N = 21), Alzheimer’s disease (AD; N = 18), dementia with Lewy bodies (DLB; N = 17) and Parkinson’s disease dementia (PDD; N = 17) patients, in the frontal, central, posterior and lateral regions. Error bars indicate the standard deviation (SD), **p < 0.05, **p < 0.01.
