Featured Videos from 200+ Articles
This section introduces you to articles where you can watch video clips illustrating our studies.
The video clip for AAAS lecture "Ai and Ayumu" was open to the public.
The 179th meeting of the AAAS was held in 14-18 Feb 2013 in Boston, USA. The video clip was open to the public in the symposium of "Breakthroughs in our understanding of primate cognition and pyshopathology". The speaker is Tetsruo Matsuzawa, PRI, Kyoto University.Read More
Behavioral recovery from tetraparesis in a captive chimpanzee
An adult male chimpanzee living in a captive social group at the Primate Research Institute of Kyoto University developed acute tetraparesis. He was paralyzed and received intensive care and veterinary treatment as previously reported in Miyabe-Nishiwaki et al. (J Med Primatol 39:336–346, 2010). The behavioral recovery of the chimpanzee was longitudinally ...Read More
Head-Mounted Eye Tracking of a Chimpanzee under Naturalistic Conditions
This study offers a new method for examining the bodily, manual, and eye movements of a chimpanzee at the micro-level. A female chimpanzee wore a lightweight head-mounted eye tracker (60 Hz) on her head while engaging in daily interactions with the human experimenter. The eye tracker recorded her eye movements accurately while the chimpanzee freely moved her head, hands, and body...Read More
Spontaneous synchronized tapping to an auditory rhythm in a chimpanzee
... we show the first evidence that a member of our closest living relatives, a chimpanzee, spontaneously synchronizes her movement with an auditory rhythm: After a training to tap illuminated keys on an electric keyboard, one chimpanzee spontaneously aligned her tapping with the sound when she heard an isochronous distractor sound...Read More
Brain response to affective pictures in the chimpanzee.
Advancement of non-invasive brain imaging techniques has allowed us to examine details of neural activities involved in affective processing in humans; however, ...Read More
Basis for cumulative cultural evolution in chimpanzees: social learning of a more efficient tool-use technique.
The evidence for culture in non-human animals has been growing incrementally over the past two decades. However, the ability for cumulative cultural evolution, with ...Read More
Relative contributions of goal representation and kinematic information to self-monitoring by chimpanzees and humans
It is important to monitor feedback related to the intended result of an action while executing that action. This monitoring process occurs hierarchically; that is, sensorimotor processing occurs at ...Read More
Chimpanzee carrying behaviour and the origins of human bipedality.
Why did our earliest hominin ancestors begin to walk bipedally as their main form of terrestrial travel? The lack of sufficient fossils and differing interpretations of existing ones leave unresolved the ...Read More
Humans and chimpanzees attend differently to goal-directed actions.
Humans comprehend the actions of others by making inferences about intentional mental states of another. However, little is known about how this capacity develops and whether this is shared with other animals. Here we show ...Read More
Chimpanzees' flexible targeted helping based on an understanding of conspecifics' goals
Humans extensively help others altruistically, which plays an important role in maintaining cooperative societies. Although some nonhuman animals are also capable of helping others altruistically, humans are ...Read More
Chimpanzees' use of conspecific cues in matching-to-sample tasks: public information use in a fully automated testing environment.
Social animals have much to gain from observing and responding appropriately to the actions of their conspecific group members. This can in turn lead to the learning of...Read More
Working memory of numerals in chimpanzees.
Chimpanzee memory has been extensively studied. The general assumption is that, as with many other cognitive functions, it is inferior to that of humans; some data, however, suggest that, in some circumstances, chimpanzee memory may indeed be superior to human m...Read More
Chimpanzees share forbidden fruit.
The sharing of wild plant foods is infrequent in chimpanzees, but in chimpanzee communities that engage in hunting, meat is frequently used as a social tool for nurturing alliances and social bonds. Here we report the only recorded example of regular sharing of plant foods by unrelated, non-provisioned wild chimpanzees ...Read More
Behavior of infant chimpanzees during the night in the first 4 months of life: smiling and suckling in relation to behavioral state.
This article reports the behavior of 3 newborn chimpanzees in the first 4 months of life, reared by their mothers and living in a community of 14 chimpanzees in a semi-natural enriched environment. We focused on spontaneous activity during the night partly ...Read More
Food transfer between chimpanzee mothers and their infants.
Food sharing among chimpanzees is known to occur particularly between mothers and infants and has been proposed to be a form of parental investment. To explore the function of food sharing, it is essential to know how and what is transferred to an infant from its mother. We investigated details of interactions leading to food transfer and characteristics of items transferred in three mother?infant pairs in captivity...Read More
Contagious yawning in chimpanzees.
Six adult female chimpanzees were shown video scenes of chimpanzees repeatedly yawning or of chimpanzees showing open-mouth facial expressions that were not yawns. Two out of the six females showed significantly higher frequencies of yawning ...Read More
Role of mothers in the acquisition of tool-use behaviours by captive infant chimpanzees.
This article explores the maternal role in the acquisition of tool-use behaviours by infant chimpanzees (Pan troglodytes). A honey-fishing task, simulating ant/termite fishing found in the wild,...Read More
Numerical memory span in a chimpanzee.
A female chimpanzee called Ai has learned to use Arabic numerals to represent numbers. She can count from zero to nine items, which she demonstrates by touching the appropriate number on a touch-sensitive monitor, and she can order the numbers from zero to nine in sequence...Read More