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AN ANALYSIS OF INTELLECTUAL STRUCTURES OF THE BRAIN-INJURIES I ON THE RELATIONSHIP BETWEEN LOCALIZATION OF FUNCTION IN THE BRAIN AND FACTORS OF INTELLIGENCE. RYUJI ITO Kobe University ABSTRACT The present study was designed to examine the relationship between localiza tion of function in the brain and represen tation of the basic factors of intelligence. The quantitative findings reported in this investigation were based upon the test results from a battery of twenty-six in telligence-psychological indicators applied individually to thirty-nine subjects, includ ing patients with various types of brain lesions, and to eighty normal control individuals. The experimental subjects were divided into a frontal lobe lesions group and a temporal lobe lesions group. The centroid method of factor analysis and orthogonal rotation of axes were applied to the correlation matrix based on those twenty-six variables, and three factors were extracted. The nature of these factors may be summarized as fol lows: (1) Factor I was interpreted as a basic capacity of reasoning. It shows the coalescence of knowledge and adaptive @intelligence. (2) The variables positively loaded with Factor II were related to the abilities of reproducing knowledges in practical situation. (3) Factor III repre sented the abilities of application of a prin ciple or knowledges to practice. When applied to patients with frontal lobe lesions and temporal lobe injuries, the following results were obtained: (1) Patients with damage in left-hemisphere of frontal lobe made poor records in var iables positively loaded with Factor I and Factor III, and (2) those with main lesions in left-hemisphere of temporal lobe made poor scores in tests loaded with Factor II and Factor III, From these facts the following infer ences were drawn: (I) Left-hemisphere of frontal lobe is relevant to the abilities of reasoning, and (2) the abilities of appli cation of a principle to practice are de pendent on left-hemisppere of temporal lobe. These findings and inferences are similar to those of W. C. Halstead.