Abstract: During the last three years We have endeavored to make a systematic "study of the chinese EEG." EEG recordings were made with an Ediswen Model-Ⅲ 16-channel electroencephalograph. The results reported here represent part of this study concerning psychological problems:1. An EEG study of the pre-school child:EEG recordings 728 pre-school children, age 4 to 7 showed a high "index of EEG" and an outstanding battle between θ and α waves. Our electroencephalographic fings in- dicate that the 4 year old child is similar to the 5 year old child and that the 6 year old child is similar to the 7 year old child; but between 5 and 6 years, three seems to a "leap".2. EEG during mental activity(mental arithmetic):Investigations of the EEG during mental activity were performed on 738 subjects. Electrical records were made simultaneously during mental activity on an eight-channel EEG form occipital, temporal, frontal, fronto-parietal and other areas. The results show that no positive correlation was found between mental activity and the traditional blocking of the occipital α wave; that the point of initiation of the central impulse of mental activity is very likely the temporal or frontal area; and that "mental arithmetic" is a valuable clinical activation.3. Study concerning cybernetics and imformation theory:Investigations of the brain's capability to receive two channel inputs simultaneously were performed on more than 1000 subjects. Using "driving response" as an objective indicator, the results seem to cast doubt upon the hypothesis that the cortex is incapable of receiving two channel inputs simultaneously and doubts also arise about the "model of attention" (Broadbent 1957) hypothesis.

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