Object manipulation in a captive troop of Japanese monkeys (Macaca fuscata): A developmental analysis |
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Authors: | Takashi Torigoe |
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Institution: | (1) Department of Psychology, Faculty of Education, Hiroshima University, 1-1-89 Higashisenda-machi, Naka-ku, 730 Hiroshima, Japan |
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Abstract: | A captive troop of Japanese monkeys (Macaca fuscata) was presented with a nylon rope, a wooden cube, and an iron tube, and their subsequent manipulations were observed in detail.
In total, 202 manipulation patterns were distinguished on the basis of three components: the actions performed, body-parts
used, and relations to other objects. The developmental changes in these modes of manipulation were analyzed cross-sectionally,
revealing four characteristics: (1) the most manipulative members of the troop were those aged 2–3 and 4–6 years old; (2)
most of the manipulatory repertoire appeared by 4–6 years old; (3) actions such as Roll, Rub, and Slide and the use of bodyparts
continued to increase in variety until 4–6 years old, while the variety of other actions showed plateaus after 2–3 years old
or an earlier age; and (4) secondary manipulations appeared at 1 year old and continued to increase in variety even after
4–6 years old. |
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Keywords: | Object manipulation Japanese monkey Development Focal object sampling |
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