4.2 Article

Variation in gaze-following between two Asian colobine monkeys

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卷 58, 期 4, 页码 525-534

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SPRINGER JAPAN KK
DOI: 10.1007/s10329-017-0612-0

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Gaze-following; Inhibitory control; Francois' langurs; Golden snub-nosed monkeys

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  1. National Natural Science Foundation of China [31371040, 31571134, J1103602]

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Gaze-following is a basic cognitive ability found in numerous primate and nonprimate species. However, little is known about this ability and its variation in colobine monkeys. We compared gaze-following of two Asian colobines-Fran double dagger ois' langurs (Trachypithecus francoisi) and golden snub-nosed monkeys (Rhinopithecus roxellana). Although both species live in small polygynous family units, units of the latter form multilevel societies with up to hundreds of individuals. Fran double dagger ois' langurs (N = 15) were less sensitive to the gaze of a human experimenter than were golden snub-nosed monkeys (N = 12). We then tested the two species using two classic inhibitory control tasks-the cylinder test and the A-not-B test. We found no difference between species in inhibitory control, which called into question the nonsocial explanation for Fran double dagger ois' langur's weaker sensitivity to human gaze. These findings are consistent with the social intelligence hypothesis, which predicted that golden snub-nosed monkeys would outperform Fran double dagger ois' langurs in gaze-following because of the greater size and complexity of their social groups. Furthermore, our results underscore the need for more comparative studies of cognition in colobines, which should provide valuable opportunities to test hypotheses of cognitive evolution.

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