AMERICAN JOURNAL OF PRIMATOLOGY 71(7) 617-622 2009年7月 [査読有り]
Marmosets exchange two types of calls: phees and trills. We played back phees and trills to investigate the temporal rules of vocal exchanges using ten captive common marmosets (Callithrix Jacchus). The marmosets usually emitted the same type of v...
JOURNAL OF THE AMERICAN ASSOCIATION FOR LABORATORY ANIMAL SCIENCE 48(3) 286-291 2009年5月 [査読有り]
Previous studies have suggested that images of conspecifics are useful for environmental enrichment for nonhuman primates, but whether the age and sex of the animals alter the effectiveness of such images is unclear. We investigated preferences to...
AMERICAN JOURNAL OF PRIMATOLOGY 70(10) 999-1002 2008年10月 [査読有り]
Food transfer is considered to provide infants with additional nutrients during weaning, and in fact, its frequency peaks around this time. However, the mechanisms underlying such food transfer remain unclear. In this study, we investigated whethe...
We investigated whetherjapanese monkeys can discriminate pictures of conspecific males and females using a visual paired comparison (VPQ task. Whole-body pictures of adult and nonadult monkeys were used as stimuli. The monkeys were first familiari...
We investigated the effects of other's attentional states on vocalizations in monkeys. The subjects were 14 Japanese monkeys (Macaca fuscata), which vocalized spontaneously in the feeding context. In the initial experiment, an experimenter moved t...