EEG findings in senile dementia and normal aging

EEG findings in 62 patients with senile dementia of Alzheimer type (SDA), 22 patients with multi‐infarct dementia (MID) and 90 controls of same age and sex were studied. The SDA patients differed significantly from the controls in EEG normality, over‐all disturbance, dominant occipital rhythm, accentuation of theta and delta, fluctuations in alertness, paroxysmal activity and H‐reaction. Even the least severely affected SDA patients differed significantly from the controls in all EEG variables except paroxysmal activity. With increasing degree of intellectual impairment in the SDA group the dominant occipital rhythm became slower.

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