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Russell, J.L.; Braccini, S.; Buehler, N.; Kachin, M.J.; Schapiro, S.J.; Hopkins, W.D. |
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Title |
Chimpanzee (Pan troglodytes) intentional communication is not contingent upon food |
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2005 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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8 |
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4 |
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263-272 |
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*Animal Communication; Animals; *Feeding Behavior; Female; Humans; Male; Pan troglodytes/*psychology |
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Studies of great apes have revealed that they use manual gestures and other signals to communicate about distal objects. There is also evidence that chimpanzees modify the types of communicative signals they use depending on the attentional state of a human communicative partner. The majority of previous studies have involved chimpanzees requesting food items from a human experimenter. Here, these same communicative behaviors are reported in chimpanzees requesting a tool from a human observer. In this study, captive chimpanzees were found to gesture, vocalize, and display more often when the experimenter had a tool than when she did not. It was also found that chimpanzees responded differentially based on the attentional state of a human experimenter, and when given the wrong tool persisted in their communicative efforts. Implications for the referential and intentional nature of chimpanzee communicative signaling are discussed. |
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Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA |
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1435-9448 |
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PMID:15742162 |
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Equine Behaviour @ team @ |
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2491 |
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Suda, C.; Call, J. |
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Title |
Piagetian conservation of discrete quantities in bonobos (Pan paniscus), chimpanzees (Pan troglodytes), and orangutans (Pongo pygmaeus) |
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Journal Article |
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Year |
2005 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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8 |
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4 |
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220-235 |
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Animals; *Behavior, Animal; Female; Hominidae/*psychology; Male; Pan paniscus; Pan troglodytes; Pongo pygmaeus; *Problem Solving |
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This study investigated whether physical discreteness helps apes to understand the concept of Piagetian conservation (i.e. the invariance of quantities). Subjects were four bonobos, three chimpanzees, and five orangutans. Apes were tested on their ability to conserve discrete/continuous quantities in an over-conservation procedure in which two unequal quantities of edible rewards underwent various transformations in front of subjects. Subjects were examined to determine whether they could track the larger quantity of reward after the transformation. Comparison between the two types of conservation revealed that tests with bonobos supported the discreteness hypothesis. Bonobos, but neither chimpanzees nor orangutans, performed significantly better with discrete quantities than with continuous ones. The results suggest that at least bonobos could benefit from the discreteness of stimuli in their acquisition of conservation skills. |
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Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany. suda@eva.mpg.de |
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PMID:15692813 |
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Equine Behaviour @ team @ |
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2494 |
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Kaminski, J.; Call, J.; Tomasello, M. |
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Title |
Body orientation and face orientation: two factors controlling apes' behavior from humans |
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Journal Article |
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Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume |
7 |
Issue |
4 |
Pages |
216-223 |
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Keywords |
Animals; *Attention; *Behavior, Animal; Cognition; *Concept Formation; Face; Facial Expression; Female; Fixation, Ocular; Hominidae/*psychology; Humans; Male; *Nonverbal Communication; *Orientation; Pan paniscus/psychology; Pan troglodytes/psychology; Pongo pygmaeus/psychology; *Posture; Social Perception; Species Specificity |
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A number of animal species have evolved the cognitive ability to detect when they are being watched by other individuals. Precisely what kind of information they use to make this determination is unknown. There is particular controversy in the case of the great apes because different studies report conflicting results. In experiment 1, we presented chimpanzees, orangutans, and bonobos with a situation in which they had to request food from a human observer who was in one of various attentional states. She either stared at the ape, faced the ape with her eyes closed, sat with her back towards the ape, or left the room. In experiment 2, we systematically crossed the observer's body and face orientation so that the observer could have her body and/or face oriented either towards or away from the subject. Results indicated that apes produced more behaviors when they were being watched. They did this not only on the basis of whether they could see the experimenter as a whole, but they were sensitive to her body and face orientation separately. These results suggest that body and face orientation encode two different types of information. Whereas face orientation encodes the observer's perceptual access, body orientation encodes the observer's disposition to transfer food. In contrast to the results on body and face orientation, only two of the tested subjects responded to the state of the observer's eyes. |
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Max Planck Institute for Evolutionary Anthropology, Deutscher Plaz 6, 04103 Leipzig, Germany. kaminski@eva.mpg.de |
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PMID:15034765 |
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Equine Behaviour @ team @ |
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2538 |
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Imura, T.; Tomonaga, M. |
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Title |
Perception of depth from shading in infant chimpanzees ( Pan troglodytes) |
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Journal Article |
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Year |
2003 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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4 |
Pages |
253-258 |
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Age Factors; Animals; Contrast Sensitivity/*physiology; Depth Perception/*physiology; Discrimination Learning/*physiology; Female; Male; Pan troglodytes/growth & development/*physiology/*psychology; Pattern Recognition, Visual/physiology |
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We investigated the ability to perceive depth from shading, one of the pictorial depth cues, in three chimpanzee infants aged 4-10 months old, using a preferential reaching task commonly used to study pictorial depth perception in human infants. The chimpanzee infants reached significantly more to three-dimensional toys than to pictures thereof and more to the three-dimensional convex than to the concave. Furthermore, two of the three infants reached significantly more to the photographic convex than to the photographic concave. These infants also looked longer at the photographic convex than the concave. Our results suggest that chimpanzees perceive, at least as early as the latter half of the first year of life, pictorial depth defined by shading information. Photographic convexes contain richer information about pictorial depth (e.g., attached shadow, cast shadow, highlighted area, and global difference in brightness) than simple computer-graphic graded patterns. These cues together might facilitate the infants' perception of depth from shading. |
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Graduate School of Humanities, Kwansei Gakuin University, Uegahara, Nishinomiya, Hyogo 662-8501, Japan |
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1435-9448 |
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PMID:14610661 |
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Equine Behaviour @ team @ |
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2550 |
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Tanaka, M.; Tomonaga, M.; Matsuzawa, T. |
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Title |
Finger drawing by infant chimpanzees ( Pan troglodytes) |
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Journal Article |
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Year |
2003 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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4 |
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245-251 |
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Animals; *Art; Female; *Fingers; *Gestures; Male; Motor Skills/*physiology; Pan troglodytes/*physiology/*psychology |
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We introduced a new technique to investigate the development of scribbling in very young infants. We tested three infant chimpanzees to compare the developmental processes of scribbling between humans and chimpanzees. While human infants start to scribble on paper at around the age of 18 months, our 13- to 23-month-old infant chimpanzees had never been observed scribbling prior to this study. We used a notebook computer with a touch-sensitive screen. This apparatus was able to record the location of the subjects' touches on the screen. Each touch generated a fingertip-sized dot at the corresponding on-screen location. During spontaneous interactions with this apparatus, all three infants and two mother chimpanzees left scribbles with their fingers on the screen. The scribbles contained not only simple dots or short lines, but also curves and hook-like lines or loops, most of which were observed in the instrumental drawings of adult chimpanzees. The results suggest that perceptual-motor control for finger drawing develops in infant chimpanzees. Two of the infants performed their first scribble with a marker on paper at the age of 20-23 months. Just prior to this, they showed a rapid increase in combinatory manipulation of objects. These findings suggest that the development of combinatory manipulation of objects as well as that of perceptual-motor control may be necessary for the emergence of instrumental drawing on paper. |
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Section of Language and Intelligence, Primate Research Institute, Kyoto University, 41 Kanrin, 484-8506 Inuyama, Aichi, Japan. mtanaka@pri.kyoto-u.ac.jp |
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1435-9448 |
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PMID:14605946 |
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Equine Behaviour @ team @ |
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2551 |
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Matsuzawa, T. |
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Title |
The Ai project: historical and ecological contexts |
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Journal Article |
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2003 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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4 |
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199-211 |
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Adaptation, Psychological; Animals; *Behavior, Animal; *Cognition; *Culture; Discrimination Learning; Ecology; Female; History, 20th Century; Imitative Behavior; *Learning; Male; Pan troglodytes/*psychology; Research/history |
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This paper aims to review a long-term research project exploring the chimpanzee mind within historical and ecological contexts. The Ai project began in 1978 and was directly inspired by preceding ape-language studies conducted in Western countries. However, in contrast with the latter, it has focused on the perceptual and cognitive capabilities of chimpanzees rather than communicative skills between humans and chimpanzees. In the original setting, a single chimpanzee faced a computer-controlled apparatus and performed various kinds of matching-to-sample discrimination tasks. Questions regarding the chimpanzee mind can be traced back to Wolfgang Koehler's work in the early part of the 20th century. Yet, Japan has its unique natural and cultural background: it is home to an indigenous primate species, the Japanese snow monkey. This fact has contributed to the emergence of two previous projects in the wild led by the late Kinji Imanishi and his students. First, the Koshima monkey project began in 1948 and became famous for its discovery of the cultural propagation of sweet-potato washing behavior. Second, pioneering work in Africa, starting in 1958, aimed to study great apes in their natural habitat. Thanks to the influence of these intellectual ancestors, the present author also undertook the field study of chimpanzees in the wild, focusing on tool manufacture and use. This work has demonstrated the importance of social and ecological perspectives even for the study of the mind. Combining experimental approaches with a field setting, the Ai project continues to explore cognition and behavior in chimpanzees, while its focus has shifted from the study of a single subject toward that of the community as a whole. |
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Section of Language and Intelligence, Primate Research Institute, Kyoto University, Japan. matsuzaw@pri.kyoto-u.ac.jp |
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PMID:14566577 |
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Equine Behaviour @ team @ |
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2552 |
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Hirata, S.; Celli, M.L. |
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Role of mothers in the acquisition of tool-use behaviours by captive infant chimpanzees |
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2003 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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4 |
Pages |
235-244 |
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Animals; Cooking and Eating Utensils; Feeding Behavior; Female; Imitative Behavior/*physiology; Male; Mothers/*psychology; Motor Skills/*physiology; Pan troglodytes/*growth & development/*psychology; Problem Solving/*physiology |
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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, was introduced to three dyads of experienced mother and naive infant chimpanzees. Four fishing sites and eight sets of 20 objects to be used as tools, not all appropriate, were available. Two of the mothers constantly performed the task, using primarily two kinds of tools; the three infants observed them. The infants, regardless of the amount of time spent observing, successfully performed the task around the age of 20-22 months, which is earlier than has been recorded in the wild. Two of the infants used the same types of tools that the adults predominantly used, suggesting that tool selectivity is transmitted. The results also show that adults are tolerant of infants, even if unrelated; infants were sometimes permitted to lick the tools, or were given the tools, usually without honey, as well as permitted to observe the adult performances closely. |
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Primate Research Institute, Kyoto University, Inuyama, Kanrin, 484-8506 Aichi, Japan. hirata@gari.be.to |
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1435-9448 |
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PMID:13680401 |
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Equine Behaviour @ team @ |
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2555 |
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Sousa, C.; Okamoto, S.; Matsuzawa, T. |
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Behavioural development in a matching-to-sample task and token use by an infant chimpanzee reared by his mother |
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2003 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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4 |
Pages |
259-267 |
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Animals; *Cognition; *Discrimination Learning; Female; *Imitative Behavior; Male; Mothers/*psychology; Pan troglodytes/*growth & development/*psychology; *Transfer (Psychology) |
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We investigated the behavioural and cognitive development of a captive male infant chimpanzee, Ayumu, raised by his mother, Ai. Here we report Ayumu's achievements up to the age of 2 years and 3 months, in the context of complex computer-controlled tasks. From soon after birth, Ayumu had been present during an experiment performed by his mother. The task consisted of two phases, a matching-to-sample task in which she received token rewards, and the insertion of these tokens into a vending machine to obtain food rewards. Ayumu himself received no reward or encouragement from humans for any of the actions he exhibited during the experiment. At the age of 9 months and 3 weeks, Ayumu performed his first matching-to-sample trial. At around 1 year and 3 months, he began to perform them consistently. Also during this period, he frequently stole food rewards from his mother. At 2 years and 3 months, Ayumu succeeded for the first time in inserting a token into the vending machine. Once he had succeeded in using a token, he performed both phases of the task in sequence 20 times consecutively. The infant's behaviour was not shaped by food rewards but by a strong motivation to copy his mother's behaviour. Our observations of Ayumu thus mirror the learning processes shown by wild chimpanzees. |
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Primate Research Institute, Kyoto University, Inuyama Aichi 484-8506, Japan. csousa@fcsh.unl.pt |
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PMID:13680400 |
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Equine Behaviour @ team @ |
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2556 |
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Hayashi, M.; Matsuzawa, T. |
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Cognitive development in object manipulation by infant chimpanzees |
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2003 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
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4 |
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225-233 |
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Age Factors; Animals; Child Development/physiology; Child, Preschool; Cognition/*physiology; Female; Growth; Humans; Imitative Behavior/physiology; Infant; Learning/*physiology; Male; Mothers/*psychology; Motor Skills/*physiology; Pan troglodytes/*growth & development/*psychology; Psychomotor Performance/*physiology; Species Specificity |
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This study focuses on the development of spontaneous object manipulation in three infant chimpanzees during their first 2 years of life. The three infants were raised by their biological mothers who lived among a group of chimpanzees. A human tester conducted a series of cognitive tests in a triadic situation where mothers collaborated with the researcher during the testing of the infants. Four tasks were presented, taken from normative studies of cognitive development of Japanese infants: inserting objects into corresponding holes in a box, seriating nesting cups, inserting variously shaped objects into corresponding holes in a template, and stacking up wooden blocks. The mothers had already acquired skills to perform these manipulation tasks. The infants were free to observe the mothers' manipulative behavior from immediately after birth. We focused on object-object combinations that were made spontaneously by the infant chimpanzees, without providing food reinforcement for any specific behavior that the infants performed. The three main findings can be summarized as follows. First, there was precocious appearance of object-object combination in infant chimpanzees: the age of onset (8-11 months) was comparable to that in humans (around 10 months old). Second, object-object combinations in chimpanzees remained at a low frequency between 11 and 16 months, then increased dramatically at the age of approximately 1.5 years. At the same time, the accuracy of these object-object combinations also increased. Third, chimpanzee infants showed inserting behavior frequently and from an early age but they did not exhibit stacking behavior during their first 2 years of life, in clear contrast to human data. |
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Section of Language and Intelligence, Primate Research Institute, Kyoto University, 41 Kanrin, Inuyama, 484-8506 Aichi, Japan. misato@pri.kyoto-u.ac.jp |
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PMID:12905079 |
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Equine Behaviour @ team @ |
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2559 |
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Biro, D.; Inoue-Nakamura, N.; Tonooka, R.; Yamakoshi, G.; Sousa, C.; Matsuzawa, T. |
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Cultural innovation and transmission of tool use in wild chimpanzees: evidence from field experiments |
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Journal Article |
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2003 |
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Animal Cognition |
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Anim. Cogn. |
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6 |
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4 |
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213-223 |
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Animals; Cooking and Eating Utensils; *Culture; *Diffusion of Innovation; *Feeding Behavior/psychology; Female; Functional Laterality; *Imitative Behavior; Male; Motor Skills; Pan troglodytes/*psychology; *Social Environment |
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Chimpanzees (Pan troglodytes) are the most proficient and versatile users of tools in the wild. How such skills become integrated into the behavioural repertoire of wild chimpanzee communities is investigated here by drawing together evidence from three complementary approaches in a group of oil-palm nut- ( Elaeis guineensis) cracking chimpanzees at Bossou, Guinea. First, extensive surveys of communities adjacent to Bossou have shown that population-specific details of tool use, such as the selection of species of nuts as targets for cracking, cannot be explained purely on the basis of ecological differences. Second, a 16-year longitudinal record tracing the development of nut-cracking in individual chimpanzees has highlighted the importance of a critical period for learning (3-5 years of age), while the similar learning contexts experienced by siblings have been found to result in near-perfect (13 out of 14 dyads) inter-sibling correspondence in laterality. Third, novel data from field experiments involving the introduction of unfamiliar species of nuts to the Bossou group illuminates key aspects of both cultural innovation and transmission. We show that responses of individuals toward the novel items differ markedly with age, with juveniles being the most likely to explore. Furthermore, subjects are highly specific in their selection of conspecifics as models for observation, attending to the nut-cracking activities of individuals in the same age group or older, but not younger than themselves. Together with the phenomenon of inter-community migration, these results demonstrate a mechanism for the emergence of culture in wild chimpanzees. |
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Primate Research Institute, Kyoto University, Japan. dora.biro@zoology.oxford.ac.uk |
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Springer-Verlag |
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| |
ISSN |
1435-9448 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
PMID:12898285 |
Approved |
no |
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| |
Call Number |
Equine Behaviour @ team @ |
Serial |
2560 |
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| Permanent link to this record |
