The authors observed 23 cases of mentally retarded children of Pusan Welfare and Rehabilitation school. In this study, we obtained following results.
1. The etiological study was obscure in disease entity but the main headings were indetermined etiology, infections, suspicious mongolism and accidents.
2. The indetermined group showed most serious mental retardation compare to the group of other etiological factors.
3. The results of I.Q. test are I.Q. 0~9 (5 persons), 20~49 (7), 50~80 (11).
4. Psychologically, they showed various types of emotional disturbances.
5. And also, some children had physical handicaps such as paralysis of extremities and ophtalmologic disturbances.
6. The persons above I.Q. 50 were educable that of lower class of primary school.
7. The brief effect of rehabilitation were fair or valuable.
8. Measurement of physical growth revealed obvious decrement of growth than normal children of the same age.
9. By the Bender-Gestalt test, 9 persons were able to draw all designs. Almost of them were found serious brain damage.
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