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Author |
de Waal, F.B.M. |
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Title |
Animal Social Conflict |
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Miscellaneous |
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Year |
1993 |
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Call Number |
Equine Behaviour @ team @ |
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4894 |
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Author |
de Waal, F.B.M. |
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Title |
Peacemaking Among Primates |
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Miscellaneous |
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Year |
1989 |
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Call Number |
Equine Behaviour @ team @ |
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4924 |
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Author |
de Waal, F.B.M. |
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Title |
Chimpanzee politics:power and sex among apes. |
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Book Whole |
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Year |
1982 |
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Johns Hopkins University Press |
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Baltimore |
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978-0801886560 |
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Call Number |
Equine Behaviour @ team @ |
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4857 |
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Author |
Dindo, M.; De Waal, F.B.M. |
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Title |
Partner effects on food consumption in brown capuchin monkeys |
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Journal Article |
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Year |
2007 |
Publication |
American journal of primatology |
Abbreviated Journal |
Am. J. Primatol. |
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Volume |
69 |
Issue |
4 |
Pages |
448-456 |
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Abstract |
It has been claimed that capuchin monkeys (Cebus apella) show inequity aversion in relation to food rewards for a simple exchange task. However, other factors may affect the willingness of a monkey to consume foods of high or low value in the presence of a conspecific. In this study, pairs of monkeys were presented with unequally valued foods, but without any task-performance: they simply received the food under four experimental conditions. By looking at the rate of collection and consumption of low-valued cucumber slices we expected to see variation dependent on whether the partner either had 1) cucumber (equity), 2) grape (inequity), 3) inaccessible cucumber or 4) inaccessible grape. Testing 12 adult capuchin monkeys, our findings differed from those of other authors in that the monkeys failed to show negative reactions to inequity, but rather responded with scramble competition (i.e., fast food collection) in the presence of a conspecific without access to food. They also showed facilitated consumption in the presence of a conspecific consuming high-valued food. Possibly, (in)equity plays a different role if food serves as a reward for a task rather than if it is simply made available for consumption. Am. J. Primatol. 69:1-9, 2007. (c) 2006 Wiley-Liss, Inc. |
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Address |
Living Links, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia |
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English |
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0275-2565 |
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PMID:17146793 |
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no |
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Call Number |
refbase @ user @ |
Serial |
158 |
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Author |
Brosnan, S.F.; Freeman, C.; De Waal, F.B.M. |
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Title |
Partner's behavior, not reward distribution, determines success in an unequal cooperative task in capuchin monkeys |
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Journal Article |
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Year |
2006 |
Publication |
American journal of primatology |
Abbreviated Journal |
Am. J. Primatol. |
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68 |
Issue |
7 |
Pages |
713-724 |
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Keywords |
Animals; Behavior, Animal/*physiology; Cebus/*physiology; *Cooperative Behavior; Female; Food Preferences/physiology; Male; *Reward |
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Abstract |
It was recently demonstrated that capuchin monkeys notice and respond to distributional inequity, a trait that has been proposed to support the evolution of cooperation in the human species. However, it is unknown how capuchins react to inequitable rewards in an unrestricted cooperative paradigm in which they may freely choose both whether to participate and, within the bounds of their partner's behavior, which reward they will receive for their participation. We tested capuchin monkeys with such a design, using a cooperative barpull, which has been used with great success in the past. Contrary to our expectations, the equity of the reward distribution did not affect success or pulling behavior. However, the behavior of the partner in an unequal situation did affect overall success rates: pairs that had a tendency to alternate which individual received the higher-value food in unequal reward situations were more than twice as successful in obtaining rewards than pairs in which one individual dominated the higher-value food. This ability to equitably distribute rewards in inherently biased cooperative situations has profound implications for activities such as group hunts, in which multiple individuals work together for a single, monopolizable reward. |
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Living Links Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, USA. sbrosna@emory.edu |
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0275-2565 |
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PMID:16786518 |
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no |
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Call Number |
refbase @ user @ |
Serial |
160 |
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Author |
Parr, L.A.; Matheson, M.D.; Bernstein, I.S.; De Waal, F.B.M. |
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Title |
Grooming down the hierarchy: allogrooming in captive brown capuchin monkeys, Cebus apella |
Type |
Journal Article |
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Year |
1997 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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Volume |
54 |
Issue |
2 |
Pages |
361-367 |
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Abstract |
Observations of captive female brown capuchin monkeys in five groups revealed that grooming is primarily the occupation of dominant females at both the individual and dyadic levels. When categorized according to rank class, alpha females were the only class to perform significantly more grooming than they received. These results are inconsistent with reports on vervets, baboons and macaques, and suggest that grooming in capuchin monkeys may have different functions from those reported for cercopithecine primates. A dyadic analysis revealed, however, that grooming occurred more often between closely ranked females, similar to what is seen in several Old World monkey species. Therefore, some aspects of grooming in capuchins are similar to that seen in Old World monkeys, but the way they distribute grooming is different, which may prompt a re-evaluation of current theories regarding the social function of allogrooming in non-human primates. |
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Yerkes Regional Primate Research Center and Department of Psychology, Emory University |
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0003-3472 |
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Notes |
PMID:9268468 |
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no |
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Call Number |
refbase @ user @ |
Serial |
200 |
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Author |
Call, J.; Aureli, F.; de Waal, F.B.M. |
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Title |
Postconflict third-party affiliation in stumptailed macaques |
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Journal Article |
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Year |
2002 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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Volume |
63 |
Issue |
2 |
Pages |
209-216 |
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Abstract |
Stumptailed macaques, Macaca arctoides, are characterized by high levels of postconflict affiliative contacts between opponents. We investigated the occurrence of postconflict affiliative contacts between opponents and third parties that were not involved in the original conflict. We collected 10-min focal observations during postconflict and control periods in which we recorded all aggressive and affiliative behaviours between opponents and third parties. We distinguished three types of third parties depending on the relationship with the focal animal: own kin, opponent's kin and individuals unrelated to both opponents. We analysed the interactions with third parties separately, while distinguishing two classes of affiliative behaviours: (1) allogrooming and contact sitting and (2) sociosexual behaviours (e.g. genital inspection). The macaques showed differences between postconflict and control periods in their affiliative contacts with third parties. Aggressors received more postconflict grooming and contact sitting from their opponents' kin, received more sociosexual behaviour from their own kin and unrelated individuals, and directed more sociosexual behaviour to unrelated individuals. Victims received and directed less postconflict grooming from and towards their own kin. They received more postconflict sociosexual behaviour from all partners except their own kin and directed more sociosexual behaviour to all partners except the opponent's kin. This study establishes the occurrence of multiple postconflict triadic affiliation in stumptailed macaques, and is the first to show that victims receive contacts from third parties in a cercopithecine species, a behaviour previously described only in chimpanzees. It also highlights the importance of analysing the different affiliative behaviours separately in postconflict situations. Otherwise, many of the patterns we report, especially those involving victims, would have been missed. |
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refbase @ user @ |
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304 |
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Author |
de Waal, F.B.M. |
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Title |
Silent invasion: Imanishi's primatology and cultural bias in science |
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Journal Article |
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Year |
2003 |
Publication |
Animal cognition |
Abbreviated Journal |
Anim. Cogn. |
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6 |
Issue |
4 |
Pages |
293-299 |
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Keywords |
Animals; *Behavior, Animal; *Culture; Ecosystem; History, 20th Century; Philosophy; Portraits; *Prejudice; Primates/*psychology; Psychology, Comparative/*history; Research Design/trends |
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Living Links, Yerkes Primate Center, Emory University, Atlanta, GA 30322, USA. dewaal@emory.edu |
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1435-9448 |
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PMID:14551801 |
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no |
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refbase @ user @ |
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178 |
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Author |
Plotnik, J.; Nelson, P.A.; de Waal, F.B.M. |
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Title |
Visual field information in the face perception of chimpanzees (Pan troglodytes) |
Type |
Journal Article |
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Year |
2003 |
Publication |
Annals of the New York Academy of Sciences |
Abbreviated Journal |
Ann N Y Acad Sci |
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Volume |
1000 |
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Pages |
94-98 |
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Keywords |
Animals; *Facial Expression; Pan troglodytes; Recognition (Psychology); Visual Fields/*physiology; Visual Perception/*physiology |
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Abstract |
Evidence for a visual field advantage (VFA) in the face perception of chimpanzees was investigated using a modification of a free-vision task. Four of six chimpanzee subjects previously trained on a computer joystick match-to-sample paradigm were able to distinguish between images of neutral face chimeras consisting of two left sides (LL) or right sides (RR) of the face. While an individual's ability to make this distinction would be unlikely to determine their suitability for the VFA tests, it was important to establish that distinctive information was available in test images. Data were then recorded on their choice of the LL vs. RR chimera as a match to the true, neutral image; a bias for one of these options would indicate an hemispatial visual field advantage. Results suggest that chimpanzees, unlike humans, do not exhibit a left visual field advantage. These results have important implications for studies on laterality and asymmetry in facial signals and their perception in primates. |
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Department of Animal Science, Cornell University, Ithaca, New York 14853, USA. jmp63@cornell.edu |
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0077-8923 |
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PMID:14766624 |
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refbase @ user @ |
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175 |
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Author |
de Waal, F.B.M. |
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Title |
Animal communication: panel discussion |
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Journal Article |
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Year |
2003 |
Publication |
Annals of the New York Academy of Sciences |
Abbreviated Journal |
Ann N Y Acad Sci |
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1000 |
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79-87 |
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Keywords |
Acoustics; Affect; *Animal Communication; Animals |
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0077-8923 |
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PMID:14766621 |
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refbase @ user @ |
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176 |
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