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Author Tennie, C.; Call, J.; Tomasello, M. url  doi
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  Title Untrained chimpanzees (Pan troglodytes schweinfurthii) fail to imitate novel actions Type Journal Article
  Year 2012 Publication PLoS One Abbreviated Journal  
  Volume 7 Issue Pages  
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  Call Number Equine Behaviour @ team @ Tennie2012 Serial 6289  
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Author Hare, B.; Rosati, A.; Kaminski, J.; Bräuer, J.; Call, J.; Tomasello, M. url  doi
openurl 
  Title The domestication hypothesis for dogs' skills with human communication: a response to Udell et al. (2008) and Wynne et al. (2008) Type Journal Article
  Year 2010 Publication Anim Behav Abbreviated Journal  
  Volume 79 Issue Pages  
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  Call Number Equine Behaviour @ team @ Hare2010 Serial 6241  
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Author Warneken, F.; Tomasello, M. url  doi
openurl 
  Title Altruistic Helping in Human Infants and Young Chimpanzees Type Journal Article
  Year 2006 Publication Science Abbreviated Journal  
  Volume 311 Issue 5765 Pages 1301-1303  
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  Abstract Human beings routinely help others to achieve their goals, even when the helper receives no immediate benefit and the person helped is a stranger. Such altruistic behaviors (toward non-kin) are extremely rare evolutionarily, with some theorists even proposing that they are uniquely human. Here we show that human children as young as 18 months of age (prelinguistic or just-linguistic) quite readily help others to achieve their goals in a variety of different situations. This requires both an understanding of others' goals and an altruistic motivation to help. In addition, we demonstrate similar though less robust skills and motivations in three young chimpanzees.  
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  Call Number Equine Behaviour @ team @ Serial 5607  
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Author Hare, B.; Tomasello, M. url  openurl
  Title Domestic Dogs (Canis familiaris) Use Human and Conspecific Social Cues to Locate Hidden Food Type Journal Article
  Year 1999 Publication Journal of Comparative Psychology Abbreviated Journal J. Comp. Psychol.  
  Volume 113 Issue 2 Pages 173-177  
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  Abstract Ten domestic dogs (Canis familiaris) of different breeds and ages were exposed to 2 different social cues indicating the location of hidden food, each provided by both a human informant and a conspecific informant (for a total of 4 different social cues). For the local enhancement cue, the informant approached the location where food was hidden and then stayed beside it. For the gaze and point cue, the informant stood equidistant between 2 hiding locations and bodily oriented and gazed toward the 1 in which food was hidden (the human informant also pointed). Eight of the 10 subjects, including the one 6-month-old juvenile, were above chance with 2 or more cues. Results are discussed in terms of the phylogenetic and ontogenetic processes by means of which dogs come to use social cues to locate food.  
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  Call Number refbase @ user @ Serial 590  
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Author Melis, A.P.; Hare, B.; Tomasello, M. url  doi
openurl 
  Title Engineering cooperation in chimpanzees: tolerance constraints on cooperation Type Journal Article
  Year 2006 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.  
  Volume 72 Issue 2 Pages 275-286  
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  Abstract The cooperative abilities of captive chimpanzees, Pan troglodytes, in experiments do not match the sophistication that might be predicted based on their naturally occurring cooperative behaviours. This discrepancy might partly be because in previous experiments potential chimpanzee cooperators were partnered without regard to their social relationship. We investigated the ability of chimpanzee dyads to solve a physical task cooperatively in relation to their interindividual tolerance levels. Pairs that were most capable of sharing food outside the test were also able to cooperate spontaneously (by simultaneously pulling two ropes) to obtain food. In contrast, pairs that were less inclined to share food outside of the test were unlikely to cooperate. Furthermore, previously successful subjects stopped cooperating when paired with a less tolerant partner, even when the food rewards were presented in a dispersed and divisible form to reduce competition between subjects. These results show that although chimpanzees are capable of spontaneous cooperation in a novel instrumental task, tolerance acts as a constraint on their ability to solve such cooperative problems. This finding highlights the importance of controlling such social constraints in future experiments on chimpanzee cooperation, and suggests that the evolution of human-like cooperative skills might have been preceded by the evolution of a more egalitarian social system and a more human-like temperament.  
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  Call Number refbase @ user @ Serial 287  
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Author Hare, B.; Tomasello, M. url  doi
openurl 
  Title Chimpanzees are more skilful in competitive than in cooperative cognitive tasks Type Journal Article
  Year 2004 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.  
  Volume 68 Issue 3 Pages 571-581  
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  Abstract In a series of four experiments, chimpanzees, Pan troglodytes, were given two cognitive tasks, an object choice task and a discrimination task (based on location), each in the context of either cooperation or competition. In both tasks chimpanzees performed more skilfully when competing than when cooperating, with some evidence that competition with conspecifics was especially facilitatory in the discrimination location task. This is the first study to demonstrate a facilitative cognitive effect for competition in a single experimental paradigm. We suggest that chimpanzee cognitive evolution is best understood in its socioecological context.  
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  Call Number refbase @ user @ Serial 584  
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Author Byrnl, R.W.; Tomasello, M. url  doi
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  Title Do rats ape? Type Journal Article
  Year 1995 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.  
  Volume 50 Issue 5 Pages 1417-1420  
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  Call Number refbase @ user @ Serial 589  
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Author Hare, B.; Addessi, E.; Call, J.; Tomasello, M.; Visalberghi, E. url  doi
openurl 
  Title Do capuchin monkeys, Cebus apella, know what conspecifics do and do not see? Type Journal Article
  Year 2003 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.  
  Volume 65 Issue 1 Pages 131-142  
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  Abstract Capuchin monkeys were tested in five experiments in which two individuals competed over food. When given a choice between retrieving a piece of food that was visible or hidden from the dominant, subordinate animals preferred to retrieve hidden food. This preference is consistent with the hypotheses that either (1) the subordinate knew what the dominant could and could not see or (2) the subordinate was monitoring the behaviour of the dominant and avoiding the piece of food that it approached. To test between these alternatives, we released subordinates with a slight head start forcing them to make their choice (between a piece of food hidden or visible to the dominant) before the dominant entered the area. Unlike chimpanzees, Pan troglodytes, subordinates that were given a head start did not preferentially approach hidden pieces of food first. Therefore, our experiments provide little support for the hypothesis that capuchin monkeys are sensitive to what another individual does or does not see. We compare our results with those obtained with chimpanzees in the same paradigm and discuss the evolution of primate social cognition. Copyright 2003 The Association for the Study of Animal Behaviour. Published by Elsevier Science Ltd. All rights reserved.  
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  Call Number refbase @ user @ Serial 586  
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Author Tomasello, M.; Call, J.; Hare, B. url  openurl
  Title Five primate species follow the visual gaze of conspecifics Type Journal Article
  Year 1998 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.  
  Volume 55 Issue 4 Pages 1063-1069  
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  Abstract Individuals from five primate species were tested experimentally for their ability to follow the visual gaze of conspecifics to an outside object. Subjects were from captive social groups of chimpanzees,Pan troglodytes, sooty mangabeys,Cercocebus atys torquatus, rhesus macaques,Macaca mulatta, stumptail macaques,M. arctoides, and pigtail macaques,M. nemestrina. Experimental trials consisted of an experimenter inducing one individual to look at food being displayed, and then observing the reaction of another individual (the subject) that was looking at that individual (not the food). Control trials consisted of an experimenter displaying the food in an identical manner when the subject was alone. Individuals from all species reliably followed the gaze of conspecifics, looking to the food about 80% of the time in experimental trials, compared with about 20% of the time in control trials. Results are discussed in terms of both the proximate mechanisms that might be involved and the adaptive functions that might be served by gaze-following.  
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  Call Number refbase @ user @ Serial 592  
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Author Tomasello, M.; Hare, B.; Agnetta, B. url  openurl
  Title Chimpanzees, Pan troglodytes, follow gaze direction geometrically Type Journal Article
  Year 1999 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.  
  Volume 58 Issue 4 Pages 769-777  
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  Abstract Two experiments on chimpanzee gaze following are reported. In the first, chimpanzee subjects watched as a human experimenter looked around various types of barriers. The subjects looked around each of the barriers more when the human had done so than in a control condition (in which the human looked in another direction). In the second experiment, chimpanzees watched as a human looked towards the back of their cage. As they turned to follow the human's gaze a distractor object was presented. The chimpanzees looked at the distractor while still following the human's gaze to the back of the cage. These two experiments effectively disconfirm the low-level model of chimpanzee gaze following in which it is claimed that upon seeing another animate being's gaze direction chimpanzees simply turn in that direction and look around for something interesting. Rather, they support the hypothesis that chimpanzees follow the gaze direction of other animate beings geometrically to specific locations, in much the same way as human infants. The degree to which chimpanzees have a mentalistic interpretation of the gaze and/or visual experience of others is still an open question.  
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  Call Number refbase @ user @ Serial 587  
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