| Records |
| Author |
Plotnik, J.; Nelson, P.A.; de Waal, F.B.M. |
| Title |
Visual field information in the face perception of chimpanzees (Pan troglodytes) |
Type |
Journal Article |
| Year |
2003 |
Publication |
Annals of the New York Academy of Sciences |
Abbreviated Journal |
Ann N Y Acad Sci |
Volume  |
1000 |
Issue |
|
Pages |
94-98 |
| Keywords |
Animals; *Facial Expression; Pan troglodytes; Recognition (Psychology); Visual Fields/*physiology; Visual Perception/*physiology |
| 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. |
| Address |
Department of Animal Science, Cornell University, Ithaca, New York 14853, USA. jmp63@cornell.edu |
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0077-8923 |
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| Notes |
PMID:14766624 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
175 |
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| Author |
de Waal, F.B.M. |
| Title |
Animal communication: panel discussion |
Type |
Journal Article |
| Year |
2003 |
Publication |
Annals of the New York Academy of Sciences |
Abbreviated Journal |
Ann N Y Acad Sci |
| Volume |
1000 |
Issue |
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Pages |
79-87 |
| Keywords |
Acoustics; Affect; *Animal Communication; Animals |
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0077-8923 |
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| Notes |
PMID:14766621 |
Approved |
no |
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refbase @ user @ |
Serial |
176 |
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| Author |
de Waal, F.B.M. |
| Title |
Darwin's legacy and the study of primate visual communication |
Type |
Journal Article |
| Year |
2003 |
Publication |
Annals of the New York Academy of Sciences |
Abbreviated Journal |
Ann N Y Acad Sci |
| Volume |
1000 |
Issue |
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Pages |
7-31 |
| Keywords |
Affect; Aggression/psychology; Animals; Culture; *Evolution; *Facial Expression; Gestures; Grooming; Humans; Laughter; *Nonverbal Communication; Primates/*physiology; Smiling; *Visual Perception |
| Abstract |
After Charles Darwin's The Expression of the Emotions in Man and Animals, published in 1872, we had to wait 60 years before the theme of animal expressions was picked up by another astute observer. In 1935, Nadezhda Ladygina-Kohts published a detailed comparison of the expressive behavior of a juvenile chimpanzee and of her own child. After Kohts, we had to wait until the 1960s for modern ethological analyses of primate facial and gestural communication. Again, the focus was on the chimpanzee, but ethograms on other primates appeared as well. Our understanding of the range of expressions in other primates is at present far more advanced than that in Darwin's time. A strong social component has been added: instead of focusing on the expressions per se, they are now often classified according to the social situations in which they typically occur. Initially, quantitative analyses were sequential (i.e., concerned with temporal associations between behavior patterns), and they avoided the language of emotions. I will discuss some of this early work, including my own on the communicative repertoire of the bonobo, a close relative of the chimpanzee (and ourselves). I will provide concrete examples to make the point that there is a much richer matrix of contexts possible than the common behavioral categories of aggression, sex, fear, play, and so on. Primate signaling is a form of negotiation, and previous classifications have ignored the specifics of what animals try to achieve with their exchanges. There is also increasing evidence for signal conventionalization in primates, especially the apes, in both captivity and the field. This process results in group-specific or “cultural” communication patterns. |
| Address |
Yerkes Primate Center, and Psychology Department, Emory University, Atlanta, Georgia 30322, USA. dewaal@emory.edu |
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0077-8923 |
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| Notes |
PMID:14766618 |
Approved |
no |
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refbase @ user @ |
Serial |
177 |
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| Author |
Parish, A.R.; De Waal, F.B. |
| Title |
The other “closest living relative”. How bonobos (Pan paniscus) challenge traditional assumptions about females, dominance, intra- and intersexual interactions, and hominid evolution |
Type |
Journal Article |
| Year |
2000 |
Publication |
Annals of the New York Academy of Sciences |
Abbreviated Journal |
Ann N Y Acad Sci |
| Volume |
907 |
Issue |
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Pages |
97-113 |
| Keywords |
Animals; *Evolution; Female; Hominidae/*physiology; Humans; *Interpersonal Relations; Male; Pan paniscus/*physiology; Sexual Behavior, Animal/*physiology |
| Abstract |
Chimpanzee (Pan troglodytes) societies are typically characterized as physically aggressive, male-bonded and male-dominated. Their close relatives, the bonobos (Pan paniscus), differ in startling and significant ways. For instance, female bonobos bond with one another, form coalitions, and dominate males. A pattern of reluctance to consider, let alone acknowledge, female dominance in bonobos exists, however. Because both species are equally “man's” closest relative, the bonobo social system complicates models of human evolution that have historically been based upon referents that are male and chimpanzee-like. The bonobo evidence suggests that models of human evolution must be reformulated such that they also accommodate: real and meaningful female bonds; the possibility of systematic female dominance over males; female mating strategies which encompass extra-group paternities; hunting and meat distribution by females; the importance of the sharing of plant foods; affinitive inter-community interactions; males that do not stalk and attack and are not territorial; and flexible social relationships in which philopatry does not necessarily predict bonding pattern. |
| Address |
Department of Anthropology, University College London, England |
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English |
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0077-8923 |
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| Notes |
PMID:10818623 |
Approved |
no |
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refbase @ user @ |
Serial |
189 |
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| Author |
Flack, J.C.; Girvan, M.; de Waal, F.B.M.; Krakauer, D.C. |
| Title |
Policing stabilizes construction of social niches in primates |
Type |
Journal Article |
| Year |
2006 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
439 |
Issue |
7075 |
Pages |
426-429 |
| Keywords |
Animals; Conflict (Psychology); Female; Macaca nemestrina/*physiology/*psychology; Male; Models, Biological; *Social Behavior |
| Abstract |
All organisms interact with their environment, and in doing so shape it, modifying resource availability. Termed niche construction, this process has been studied primarily at the ecological level with an emphasis on the consequences of construction across generations. We focus on the behavioural process of construction within a single generation, identifying the role a robustness mechanism--conflict management--has in promoting interactions that build social resource networks or social niches. Using 'knockout' experiments on a large, captive group of pigtailed macaques (Macaca nemestrina), we show that a policing function, performed infrequently by a small subset of individuals, significantly contributes to maintaining stable resource networks in the face of chronic perturbations that arise through conflict. When policing is absent, social niches destabilize, with group members building smaller, less diverse, and less integrated grooming, play, proximity and contact-sitting networks. Instability is quantified in terms of reduced mean degree, increased clustering, reduced reach, and increased assortativity. Policing not only controls conflict, we find it significantly influences the structure of networks that constitute essential social resources in gregarious primate societies. The structure of such networks plays a critical role in infant survivorship, emergence and spread of cooperative behaviour, social learning and cultural traditions. |
| Address |
Santa Fe Institute, Santa Fe, New Mexico 87501, USA. jflack@santafe.edu |
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English |
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1476-4687 |
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Conference |
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| Notes |
PMID:16437106 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
298 |
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| Author |
de Waal, F.B.M. |
| Title |
A century of getting to know the chimpanzee |
Type |
Journal Article |
| Year |
2005 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
437 |
Issue |
7055 |
Pages |
56-59 |
| Keywords |
Aggression; Animals; Behavior, Animal/*physiology; Competitive Behavior; Cooperative Behavior; Female; Humans; Male; Pan troglodytes/genetics/*physiology/psychology; Sexual Behavior, Animal; *Social Behavior |
| Abstract |
A century of research on chimpanzees, both in their natural habitat and in captivity, has brought these apes socially, emotionally and mentally much closer to us. Parallels and homologues between chimpanzee and human behaviour range from tool-technology and cultural learning to power politics and intercommunity warfare. Few behavioural domains have remained untouched by this increased knowledge, which has dramatically challenged the way we view ourselves. The sequencing of the chimpanzee genome will no doubt bring more surprises and insights. Humans do occupy a special place among the primates, but this place increasingly has to be defined against a backdrop of substantial similarity. |
| Address |
Living Links, Yerkes National Primate Research Center, Emory University, 954 North Gatewood Road, Atlanta, Georgia 30322, USA. dewaal@emory.edu |
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English |
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1476-4687 |
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Conference |
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| Notes |
PMID:16136128 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
162 |
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| Author |
Whiten, A.; Horner, V.; de Waal, F.B.M. |
| Title |
Conformity to cultural norms of tool use in chimpanzees |
Type |
Journal Article |
| Year |
2005 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
437 |
Issue |
7059 |
Pages |
737-740 |
| Keywords |
Aging/physiology; Animals; Culture; Feeding Behavior/physiology; Female; Pan troglodytes/*physiology/*psychology; *Social Conformity; Technology; Time Factors |
| Abstract |
Rich circumstantial evidence suggests that the extensive behavioural diversity recorded in wild great apes reflects a complexity of cultural variation unmatched by species other than our own. However, the capacity for cultural transmission assumed by this interpretation has remained difficult to test rigorously in the field, where the scope for controlled experimentation is limited. Here we show that experimentally introduced technologies will spread within different ape communities. Unobserved by group mates, we first trained a high-ranking female from each of two groups of captive chimpanzees to adopt one of two different tool-use techniques for obtaining food from the same 'Pan-pipe' apparatus, then re-introduced each female to her respective group. All but two of 32 chimpanzees mastered the new technique under the influence of their local expert, whereas none did so in a third population lacking an expert. Most chimpanzees adopted the method seeded in their group, and these traditions continued to diverge over time. A subset of chimpanzees that discovered the alternative method nevertheless went on to match the predominant approach of their companions, showing a conformity bias that is regarded as a hallmark of human culture. |
| Address |
Centre for Social Learning and Cognitive Evolution, School of Psychology, University of St Andrews, St Andrews, Fife, KY16 9JP, UK. a.whiten@st-and.ac.uk |
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English |
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1476-4687 |
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| Notes |
PMID:16113685 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
163 |
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| Author |
Brosnan, S.F.; De Waal, F.B.M. |
| Title |
Monkeys reject unequal pay |
Type |
Journal Article |
| Year |
2003 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
425 |
Issue |
6955 |
Pages |
297-299 |
| Keywords |
Aging; Animals; Cebus/*psychology; Choice Behavior; *Cooperative Behavior; Female; Male; *Reward; Social Justice |
| Abstract |
During the evolution of cooperation it may have become critical for individuals to compare their own efforts and pay-offs with those of others. Negative reactions may occur when expectations are violated. One theory proposes that aversion to inequity can explain human cooperation within the bounds of the rational choice model, and may in fact be more inclusive than previous explanations. Although there exists substantial cultural variation in its particulars, this 'sense of fairness' is probably a human universal that has been shown to prevail in a wide variety of circumstances. However, we are not the only cooperative animals, hence inequity aversion may not be uniquely human. Many highly cooperative nonhuman species seem guided by a set of expectations about the outcome of cooperation and the division of resources. Here we demonstrate that a nonhuman primate, the brown capuchin monkey (Cebus apella), responds negatively to unequal reward distribution in exchanges with a human experimenter. Monkeys refused to participate if they witnessed a conspecific obtain a more attractive reward for equal effort, an effect amplified if the partner received such a reward without any effort at all. These reactions support an early evolutionary origin of inequity aversion. |
| Address |
Living Links, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA. sbrosna@emory.edu |
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1476-4687 |
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| Notes |
PMID:13679918 |
Approved |
no |
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refbase @ user @ |
Serial |
179 |
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| Author |
de Waal, F.B.; Berger, M.L. |
| Title |
Payment for labour in monkeys |
Type |
Journal Article |
| Year |
2000 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
404 |
Issue |
6778 |
Pages |
563 |
| Keywords |
Animals; Cebus/*physiology; *Cooperative Behavior; Evolution; *Feeding Behavior; Female; Male; Reward |
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Living Links, Yerkes Regional Primate Research Center, and Department of Psychology, Emory University, Atlanta, Georgia 30329, USA. dewaal@emory.edu |
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0028-0836 |
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| Notes |
PMID:10766228 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
190 |
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| Author |
Parr, L.A.; de Waal, F.B. |
| Title |
Visual kin recognition in chimpanzees |
Type |
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| Year |
1999 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
399 |
Issue |
6737 |
Pages |
647-648 |
| Keywords |
Animals; *Behavior, Animal; Face; Female; Male; Pan troglodytes/*physiology |
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0028-0836 |
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| Notes |
PMID:10385114 |
Approved |
no |
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refbase @ user @ |
Serial |
195 |
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