Summary1) A high incidence (46 90 of electroencephalographic abnormality among the children suffered from behavior disorder was investigated in 50 cases. Eight cases had a typical seizure discharges in electroencephalographic patterns.2) Many cases (60%, had some suspected causes of brain disturbances in their anamnesis, but far less hereditary factors.3) Possible pathophysiological factors in abnormal behavior and emotion were discussed through the electroencephalohraphic changes and clinical picture of these cases. The somatic changes involving the central physiological phenomenon are not only as a result of emotion, but they will frame the character and process of emotion.The abstract of this paper had been read before the 53rd Congress of Japan Neuropsychiatric Society at April 1956, and the 1st Meeting of Middle Japan Pediatric Society at November