発育と発達におけるCatch-up現象について

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The main purpose of the investigation is to study the catch-up or recovery phenomenon following the removal of inhibitor which behaves to check growth and development. It has been mentioned that the organism is inherently a self-regulatory or target-seeking agent and has a homeorhesis-functioning. So, if the operations of sensory deprivation, food deprivation, motor restriction and so on, which inhibit his physical and behavioral developments in early infant are removed, his retarded developmental process will be gradually recovered by means of his self-regulatory or target-seeking mechanism. But, there is probably a case which sustains a critical damage under the specific conditions of experimental variables: e. g., (1) the time of early age at which these inhibitors act him, and (2) the strength or duration of these inhibitors. Thus, two experiments were designed and carried out. In Exp. 1, to examine the catch-up in body weights, 64 mice subjects were received food deprivation (the deprivation of 23hrs. per day or 47hrs. per two days) for a long term (the duration of 2 or 5 weeks) at early developmental age (the age of 3 or 5 weeks). Their body weights were recorded every day. The main results were as follows: (1) The 23hrs./day deprived mice showed more rapid catch-up than the 47hrs./two days deprived. (2) The mice deprived for 2 weeks showed more rapid catch-up than the mice deprived for 5 weeks. (3) Female mice were more promptive catch-up than male. (4) The male mice, received the 47hrs./two days food deprivation for 5 weeks just from weaning, did not result the clear catch-up. (5) In contrast to (4), the male mice, received the 47hrs./two days food deprivation for 5 weeks from the age of 5 weeks, resulted the catch-up. (6) From (4) and (5), it was concluded that there was a critical or sensitive period in the functioning of target-seeking mechanism. Exp. II was carried out to clarify the effects of the restriction of physical activities and locomotive movements in infancy on the learning of running a way at his later young adult age. This restriction was experimentally made by the very small rearing cage. Rearing in such a cage for a long time, the infant will be produced a motor disturbance and, therefore, a certain motor learning retardation. But, following the removal of its restriction, he will persevere in his efforts to return to the normal development by means of his targetseeking functioning. Consequently, it is expected that a catch-up phenomenon will be occured in motor activities and learning. 10 male mice (controlled group: G 1) were reared in a wide individual cage (30×18×15cm^3) and 16 male mice (experimental group) were reared in a small cage (8.5×7×8cm^3) individually. After breeding under the above conditions for 5 weeks just from weaning, 8 mice (G2) of experimental group were moved into a wide cage and other 8 (G3) were in a small cage as before. And then, all subjects were given the 23hrs./day food deprivation schedule during 13 days. From the 4th day to the 13th, they run a way (36cm. long) in order to get a pellet 20 times a day. The results in Exp. II were as follows: (1) At the early stage of motorlearning, experimental group was poorer than controlled group in the learning to run a way. (2) From the 3rd day on, there was no significant difference between controlled group and experimental group. (3) No significant difference was found between two experimental groups. (4) In discussing (1) and (2), it was suggested that there was a catch-up phenomenon in motor learning.
横浜国立大学の論文
1977-11-30

著者

平出彦仁
心理学教室

発育と発達におけるCatch-up現象について

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