Visual preference in a human-reared agile gibbon (<Emphasis Type="Italic">Hylobates agilis</Emphasis>) |
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Authors: | Masayuki Tanaka Makiko Uchikoshi |
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Institution: | (1) Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan;(2) Wildlife Research Center, Kyoto University, 2-24 Tanaka-sekiden-cho, Sakyo-ku, Kyoto 606-8203, Japan |
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Abstract: | Visual preference was evaluated in a male agile gibbon. The subject was raised by humans immediately after birth, but lived
with his biological family from one year of age. Visual preference was assessed using a free-choice task in which five or
six photographs of different primate species, including humans, were presented on a touch-sensitive screen. The subject touched
one of them. Food rewards were delivered irrespective of the subject’s responses. We prepared two types of stimulus sets.
With set 1, the subject touched photographs of humans more frequently than those of other species, recalling previous findings
in human-reared chimpanzees. With set 2, photographs of nine species of gibbons were presented. Chimpanzees touched photographs
of white-handed gibbons more than those of other gibbon species. The gibbon subject initially touched photographs of agile
gibbons more than white-handed gibbons, but after one and two years his choice patterns resembled the chimpanzees’. The results
suggest that, as in chimpanzees, visual preferences of agile gibbons are not genetically programmed but develop through social
experience during infancy. |
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Keywords: | |
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