There are great difficulties and many problems which have not been fully solved yet in assessing psychologically cerebral palsied (cp) children correctly. It is because they have various disorders (i. e. sensory, perceptual, behabioral or expressive, etc.) as well as motor handicap. So, this research was designed to examine (1) the degree of validity of appling such standardized intelligence test as WISC to CP children and (2) the developmental change of their intelligence. The londitudinal data of WISC applied in a Special School for the crippled were used for these purposes. All the subjects were the pupils of this school. The subjects consisted of the three following groups. 1) Group I consisted of 81 CP children (46 males and 35 females) to whom WISC had been applied in the first and the fourth grade of the primary department of the school. 2) Grbmp II consisted of 53 CP children (26 males and 27 females) to whom WISC had been applied in the fourth and the sixth grade of the primary department. 3) Group III consisted of 53 CP children (31 males and 22 females) to whom WISC had been applied in the sixth grade of the primary department and the third grade of the lower secondary department. In this way the longitudinal data were obtained four times (i. e. the first, fourth and sixth grade of the primary school and the third grade of the lower secondary school) for nine years. Each measured score was compared and correlated with the scores of its neighbouring times. By comparing the data, the following results were obtained. 1) Between any two neighbouring times of assessment, all the measured scores had very high correlations. Almost all rs obtained from IQ scores were over 0.80, especially in the group III all rs were over 0.90 and about S. S. scores, rs were between 0.58 (group I) and 0.80 (group III) on the average. By these facts, it was cleared that WISC had high stability (reliability) for CP children, also. But, can we regard these high correlations only as indexes of high validity? The author considers that we have to discuss the validity of the test from as many aspects as possible, such as the situations and the purposes of the test as well as the way of utilizing the results, the viewpoints of the persons concerned to the test and the atti tude of the children on the test situations,etc. Here, we can point out only one factthat WISC has high reliability for CP children. 2) It became clear that the measured intelligence scores of CP children show a remarkable change both qualitatively and quantitatively. In other words, the measured intelligence scores show most sudden upward change between the first and the fourth grade of the primary school, then reach the plateau, and slight decrease is observed between the sixth grade of the primary scool and the third grade of the lower secondary school. Discussing these developmental changes, we must discriminate two factors, which are (1) the improvement of the test situations, and (2) the developmental change of the intelligence. Throughout the test situations, we observe improvement and development of emotion and social matugity as well as those of intelligence. These developments seem to derive from the effect of school education and group life in the early period. Then, the author considers that the development of the intelligence means "catching phenomenon" to the norm of the general population. Our data also show that remarkable improvement is expected before the children become about ten years old, as many other studies do. we also paied attention to the change of intelligence profile. In the first grade profile, several partial collapses are conspicuous in such as "Information" "Arithmetic" "Vocabulary" and "Maze" etc. These collapses seem to result from the deficiency of learning and experience, for these collapses soon recovered at latest in the fourth grade profile.
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