Development of object manipulation in the infants of Japanese monkeys.
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概要
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Seven infants of Japanese monkeys were observed for six months from birth at a captive troop and the development of object manipulation in this species was described. The developmental process of manipulation proved to be divided into three periods in terms of actions performed and body-parts used. During the first month after birth, manipulation by the mouth was dominant, whereas the use of hands was sporadic. Kinds of actions performed were limited. During the second and third months after birth, the palmar hand became dominant in manipulation. The variety of action increased also in this period. From the fourth month on, fingers were used for fine manipulation. Results were also related to the other non-human primates' data on manipulation, indicating that the primate-common modes of manipulation developed first and that those modes characterizing the old world monkeys developed thereafter.
- 公益社団法人 日本心理学会の論文