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Author Herrmann, E.; Melis, A.P.; Tomasello, M. doi  openurl
  Title Apes' use of iconic cues in the object-choice task Type Journal Article
  Year 2006 Publication Animal cognition Abbreviated Journal Anim. Cogn.  
  Volume 9 Issue 2 Pages 118-130  
  Keywords Animal Communication; Animals; *Appetitive Behavior; *Choice Behavior; *Cues; Female; Gorilla gorilla; Male; *Nonverbal Communication; Pan paniscus; Pan troglodytes; Pongo pygmaeus; *Problem Solving; Space Perception; Species Specificity; Statistics, Nonparametric  
  Abstract In previous studies great apes have shown little ability to locate hidden food using a physical marker placed by a human directly on the target location. In this study, we hypothesized that the perceptual similarity between an iconic cue and the hidden reward (baited container) would help apes to infer the location of the food. In the first two experiments, we found that if an iconic cue is given in addition to a spatial/indexical cue – e.g., picture or replica of a banana placed on the target location – apes (chimpanzees, bonobos, orangutans, gorillas) as a group performed above chance. However, we also found in two further experiments that when iconic cues were given on their own without spatial/indexical information (iconic cue held up by human with no diagnostic spatial/indexical information), the apes were back to chance performance. Our overall conclusion is that although iconic information helps apes in the process of searching hidden food, the poor performance found in the last two experiments is due to apes' lack of understanding of the informative (cooperative) communicative intention of the experimenter.  
  Address Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany. eherrman@eva.mpg.de  
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  Language English Summary Language Original Title  
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  ISSN 1435-9448 ISBN Medium  
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  Notes PMID:16395566 Approved no  
  Call Number Serial 14  
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Author Hare, B.; Call, J.; Tomasello, M. doi  openurl
  Title Do chimpanzees know what conspecifics know? Type Journal Article
  Year 2001 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.  
  Volume 61 Issue 1 Pages 139-151  
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  Abstract We conducted three experiments on social problem solving by chimpanzees, Pan troglodytes. In each experiment a subordinate and a dominant individual competed for food, which was placed in various ways on the subordinate's side of two opaque barriers. In some conditions dominants had not seen the food hidden, or food they had seen hidden was moved elsewhere when they were not watching (whereas in control conditions they saw the food being hidden or moved). At the same time, subordinates always saw the entire baiting procedure and could monitor the visual access of their dominant competitor as well. If subordinates were sensitive to what dominants did or did not see during baiting, they should have preferentially approached and retrieved the food that dominants had not seen hidden or moved. This is what they did in experiment 1 when dominants were either uninformed or misinformed about the food's location. In experiment 2 subordinates recognized, and adjusted their behaviour accordingly, when the dominant individual who witnessed the hiding was replaced with another dominant individual who had not witnessed it, thus demonstrating their ability to keep track of precisely who has witnessed what. In experiment 3 subordinates did not choose consistently between two pieces of hidden food, one of which dominants had seen hidden and one of which they had not seen hidden. However, their failure in this experiment was likely to be due to the changed nature of the competition under these circumstances and not to a failure of social-cognitive skills. These findings suggest that at least in some situations (i.e. competition with conspecifics) chimpanzees know what conspecifics have and have not seen (do and do not know), and that they use this information to devise effective social-cognitive strategies. Copyright 2001 The Association for the Study of Animal Behaviour.  
  Address Department of Psychology and Yerkes Regional Primate Research Center, Emory University  
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  ISSN 0003-3472 ISBN Medium  
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  Notes PMID:11170704 Approved no  
  Call Number refbase @ user @ Serial 588  
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Author Carpenter, M.; Nagell, K.; Tomasello, M.; Butterworth, G.; Moore, C. openurl 
  Title Social Cognition, Joint Attention, and Communicative Competence from 9 to 15 Months of Age Type Journal Article
  Year 1998 Publication Monographs of the Society for Research in Child Development Abbreviated Journal Monogr Soc Res Child Dev  
  Volume 63 Issue 4 Pages 1-174  
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  Abstract At around 1 year of age, human infants display a number of new behaviors that seem to indicate a newly emerging understanding of other persons as intentional beings whose attention to outside objects may be shared, followed into, and directed in various ways. These behaviors have mostly been studied separately. In the current study, we investigated the most important of these behaviors together as they emerged in a single group of 24 infants between 9 and 15 months of age. At each of seven monthly visits, we measured joint attentional engagement, gaze and point following, imitation of two different kinds of actions on objects, imperative and declarative gestures, and comprehension and production of language. We also measured several nonsocial-cognitive skills as a point of comparison. We report two studies. The focus of the first study was the initial emergence of infants' social-cognitive skills and how these skills are related to one another developmentally. We found a reliable pattern of emergence: Infants progressed from sharing to following to directing others' attention and behavior. The nonsocial skills did not emerge predictably in this developmental sequence. Furthermore, correlational analyses showed that the ages of emergence of all pairs of the social-cognitive skills or their components were interrelated. The focus of the second study was the social interaction of infants and their mothers, especially with regard to their skills of joint attentional engagement (including mothers' use of language to follow into or direct infants' attention) and how these skills related to infants' early communicative competence. Our measures of communicative competence included not only language production, as in previous studies, but also language comprehension and gesture production. It was found that two measures-the amount of time infants spent in joint engagement with their mothers and the degree to which mothers used language that followed into their infant's focus of attention-predicted infants' earliest skills of gestural and linguistic communication. Results of the two studies are discussed in terms of their implications for theories of social-cognitive development, for theories of language development, and for theories of the process by means of which human children become fully participating members of the cultural activities and processes into which they are born.  
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  Call Number refbase @ user @ Serial 3997  
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Author Tomasello, M.; Call, J. openurl 
  Title Do chimpanzees know what others see ? or only what they are looking at? Type Book Chapter
  Year 2006 Publication Rational Animals? Abbreviated Journal  
  Volume Issue Pages 371-384  
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  Publisher Oxford University Press Place of Publication Oxford Editor Nudds, M.; Hurley, S.  
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  Call Number Equine Behaviour @ team @ Serial 4094  
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Author Tomasello, M.; Call,J isbn  openurl
  Title Primate Cognition Type Book Whole
  Year 1997 Publication Oxford University Press Abbreviated Journal Oxf. Univ. Pr.  
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  Abstract Description

Ever since Charles Darwin first formulated his theories on evolution, much research has been conducted in primate cognition. In this book, Michael Tomasello and Josep Call review what is already known about the cognitive skills of nonhuman primates, and assess the current state of our knowledge. They integrate empirical findings on the topic from the beginning of the century to the present, placing this work in theoretical perspective. The first part examines the way primates adapt to their physical world, mostly for the purpose of foraging. The second part lokos at primate social knowledhe and focuses on the adaptations of primates to their social world for purposes of competation and cooperation. In the third section, the authors construct a general theory of primate cognition, distinguishing the cognition in primates from that of other mammals (human in particular). Their broad-ranging theory should provide a guide for future research. Primate Cognition is an enlightening exploration of the cognitive capacities of our nearest primate relatives. It is a useful resource for a eide range of researchers and students in psychology, behavioral biology, primatology, and anthropology.
 
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  Publisher Oxford University Press Place of Publication Oxford Editor  
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  ISSN ISBN 9780195106244 Medium  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 4424  
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Author Tomasello, M. openurl 
  Title Cultural transmission in the tool use and communicatory signalling of chimpanzees? Type Book Chapter
  Year 1990 Publication Language and Intelligence in Monkeys and Apes. Abbreviated Journal  
  Volume Issue Pages 274-311  
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  Publisher Cambridge University Press Place of Publication Cambridge Editor Parker,S.T.;Gibson,K.R.  
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  Call Number Equine Behaviour @ team @ Serial 5267  
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Author Tomasello, M. openurl 
  Title The cultural origins of human cognition. Type Book Whole
  Year 1999 Publication Abbreviated Journal  
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  Publisher Harvard University Press Place of Publication Camebridge,MA. Editor  
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  Call Number Equine Behaviour @ team @ Serial 5597  
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Author Tomasello, M. openurl 
  Title Do apes ape? Type Book Chapter
  Year 1996 Publication Social learning in animals: the roots of culture Abbreviated Journal  
  Volume Issue Pages 319-346  
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  Publisher Academic Press Place of Publication London Editor Heyes, C. M.; Galef, B.G.  
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  Call Number Equine Behaviour @ team @ Serial 5600  
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Author Tomasello, M.; Davis-Dasilva, M.; Camak, L.; Bard, K. url  doi
openurl 
  Title Observational learning of tool-use by young chimpanzees Type Journal Article
  Year 1987 Publication Abbreviated Journal Human Evolution  
  Volume 2 Issue 2 Pages 175-183  
  Keywords Chimpanzees; Observational Learning; Tool-Use  
  Abstract In the current study two groups of young chimpanzees (4–6 and 8–9 years old) were given a T-bar and a food item that could only be reached by using the T-bar. Experimental subjects were given the opportunity to observe an adult using the stick as a tool to obtain the food; control subjects were exposed to the adult but were given no demonstration. Subjects in the older group did not learn to use the tool. Subjects in the younger group who were exposed to the demonstrator learned to use the stick as a tool much more readily than those who were not. None of the subjects demonstrated an ability to imitatively copy the demonstrator's precise behavioral strategies. More than simple stimulus enhancement was involved, however, since both groups manipulated the T-bar, but only experimental subjects used it in its function as a tool. Our findings complement naturalistic observations in suggesting that chimpanzee tool-use is in some sense «culturally transmitted» — though perhaps not in the same sense as social-conventional behaviors for which precise copying of conspecifics is crucial.  
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  Publisher Kluwer Academic Publishers Place of Publication Editor  
  Language English Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 0393-9375 ISBN Medium  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 5915  
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Author Bräuer, J.; Call, J.; Tomasello, M. url  doi
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  Title Chimpanzees do not take into account what others can hear in a competitive situation Type Journal Article
  Year 2008 Publication Animal Cognition Abbreviated Journal Anim. Cogn.  
  Volume 11 Issue 1 Pages 1435-9448  
  Keywords Social cognition – Food competition – Perspective taking  
  Abstract Chimpanzees (Pan troglodytes) know what others can and cannot see in a competitive situation. Does this reflect a general understanding the perceptions of others` In a study by Hare et al. (2000) pairs of chimpanzees competed over two pieces of food. Subordinate individuals preferred to approach food that was behind a barrier that the dominant could not see, suggesting that chimpanzees can take the visual perspective of others. We extended this paradigm to the auditory modality to investigate whether chimpanzees are sensitive to whether a competitor can hear food rewards being hidden. Results suggested that the chimpanzees did not take what the competitor had heard into account, despite being able to locate the hiding place themselves by the noise.  
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  Notes Approved no  
  Call Number Admin @ knut @ Serial 4218  
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