Abstract
From various points of view, authors examined frequency of abnormal EEG. in 2374 cases of diseases (i. e. 718 cases of epilepsies, 249 case of headaches, 618 cases of head injuries, 89 cases of brain tumors, 281 cases of nervousness and neuroses, 109 cases of endogenous psychoses, 36 cases of feeble mindedness, 18 cases of problem children, 42 cases of Ménière's diseases, 6 cases of senile psychoses and 208 cases of neurologic, somatic diseases), and mentioned the state of abnormal EEG.