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Author Plotnik, J.; Nelson, P.A.; de Waal, F.B.M. openurl 
  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 (up) 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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  Series Volume Series Issue Edition  
  ISSN 0077-8923 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:14766624 Approved no  
  Call Number refbase @ user @ Serial 175  
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Author de Waal, F.B.M. openurl 
  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 (up) 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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  ISSN 0077-8923 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:14766618 Approved no  
  Call Number refbase @ user @ Serial 177  
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Author de Waal, F.B.M. openurl 
  Title Animal Social Conflict Type Miscellaneous
  Year 1993 Publication Abbreviated Journal  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 4894  
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Author de Waal, F.B.M. openurl 
  Title Peacemaking Among Primates Type Miscellaneous
  Year 1989 Publication Abbreviated Journal  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 4924  
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Author de Waal, F.B.M. openurl 
  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 (up) Pages 79-87  
  Keywords Acoustics; Affect; *Animal Communication; Animals  
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  Series Volume Series Issue Edition  
  ISSN 0077-8923 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:14766621 Approved no  
  Call Number refbase @ user @ Serial 176  
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Author de Waal, F.B.M. isbn  openurl
  Title Chimpanzee politics:power and sex among apes. Type Book Whole
  Year 1982 Publication Abbreviated Journal  
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  Publisher Johns Hopkins University Press Place of Publication Baltimore Editor  
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  ISSN ISBN 978-0801886560 Medium  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 4857  
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Author de Waal, F.B.M.; Aureli, F. openurl 
  Title Consolation, reconciliation, and a possible cognitive difference between macaque and chimpanzee Type Book Chapter
  Year 1996 Publication Reaching into Thought: The Minds of the Great Apes Abbreviated Journal  
  Volume Issue (up) Pages 80–110.  
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  Abstract Russon,A.E.; Bard, K.A.; Parker, S.T.  
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  Publisher Cambridge University Press Place of Publication Cambridge Editor Russon,A.E.; Bard, K.A.; Parker, S.T.  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 5060  
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Author Bonnie, K.E.; de Waal, F.B.M. doi  openurl
  Title Affiliation promotes the transmission of a social custom: handclasp grooming among captive chimpanzees Type Journal Article
  Year 2006 Publication Primates Abbreviated Journal Primates  
  Volume 47 Issue (up) 1 Pages 27-34  
  Keywords Animals; Animals, Zoo/*physiology; Behavior, Animal/*physiology; *Cultural Evolution; Grooming/*physiology; Observation; Pan troglodytes/*physiology; *Social Behavior  
  Abstract Handclasp grooming is a unique social custom, known to occur regularly among some, but not all populations of chimpanzees (Pan troglodytes). As with other cultural behaviors, it is assumed that this distinctive grooming posture is learned socially by one individual from another. However, statistical comparisons among factors thought to influence how a behavior spreads within a group have never, to our knowledge, been conducted. In the present study, the origination and spread of handclasp grooming in a group of captive chimpanzees was followed throughout more than 1,500 h of observation over a period of 12 years. We report on the frequency, bout duration, and number and demography of performers throughout the study period, and compare these findings to those reported for wild populations. We predicted that dyads with strong affiliative ties, measured by time spent in proximity to and grooming one another, were likely to develop a handclasp grooming partnership during the study period. A quadratic assignment procedure was used to compare correlations among observed frequencies of grooming and proximity with handclasp grooming in all possible dyads within the group. As predicted, the formation of new handclasp grooming dyads was positively correlated with the rate of overall grooming and proximity within a dyad. In addition, in nearly all dyads formed, at least one individual had been previously observed to handclasp groom. We concluded that affiliation and individual experience determines the transmission of handclasp grooming among captive chimpanzees.  
  Address Department of Psychology, Emory University, and Living Links Center, Yerkes National Primate Research Center, GA 30329, USA. kebonni@emory.edu  
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  Series Volume Series Issue Edition  
  ISSN 0032-8332 ISBN Medium  
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  Notes PMID:16142425 Approved no  
  Call Number refbase @ user @ Serial 161  
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Author Weaver, A.; de Waal, F.B.M. openurl 
  Title The mother-offspring relationship as a template in social development: reconciliation in captive brown capuchins (Cebus apella) Type Journal Article
  Year 2003 Publication Journal of comparative psychology (Washington, D.C. : 1983) Abbreviated Journal J Comp Psychol  
  Volume 117 Issue (up) 1 Pages 101-110  
  Keywords *Adaptation, Psychological; Animals; Behavior, Animal/*physiology; Cebus; Conflict (Psychology); Female; Male; *Maternal Behavior; Pilot Projects; *Social Behavior; Statistics, Nonparametric  
  Abstract Mother-offspring (MO) relationship quality was investigated to determine its influence on the development of reconciliation--affiliation between opponents shortly after a fight--because it influenceswhat distressed youngsters learn about calming down. Data were longitudinal and cross-sectional observational samples of 38 MO pairs of monkeys across 24 months. An MO relationship quality index (RQI) classified each pair as secure or insecure. Reconciliation emerged in infancy.Secure youngsters had an appeasing conciliatory style, and insecure youngsters had an agitated conciliatory style. Conclusions are that reconciliation develops from the attachment behavior system and MO RQI is related to the particular conciliatory style youngsters develop by affecting how aroused they are by conflict and the subsequent socializing they seek to calm down.  
  Address Living Links, Yerkes Primate Center and Psychology Department, Emory University, Atlanta, Georgia 30322, USA. dazzlingdolphins@cox.net  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0735-7036 ISBN Medium  
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  Notes PMID:12735370 Approved no  
  Call Number refbase @ user @ Serial 180  
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Author Preston, S.D.; de Waal, F.B.M. doi  openurl
  Title Empathy: Its ultimate and proximate bases Type Journal Article
  Year 2002 Publication Behavioral and Brain Sciences Abbreviated Journal Behav Brain Sci  
  Volume 25 Issue (up) 1 Pages 1-20; discussion 20-71  
  Keywords Adult; Animals; Child; Emotions/physiology; *Empathy; Evolution; Haplorhini; Helping Behavior; Humans; Mental Disorders/physiopathology/psychology; Morals; Personality Development; Phylogeny; Prefrontal Cortex/physiopathology; Socialization  
  Abstract There is disagreement in the literature about the exact nature of the phenomenon of empathy. There are emotional, cognitive, and conditioning views, applying in varying degrees across species. An adequate description of the ultimate and proximate mechanism can integrate these views. Proximately, the perception of an object's state activates the subject's corresponding representations, which in turn activate somatic and autonomic responses. This mechanism supports basic behaviors (e.g., alarm, social facilitation, vicariousness of emotions, mother-infant responsiveness, and the modeling of competitors and predators) that are crucial for the reproductive success of animals living in groups. The Perception-Action Model (PAM), together with an understanding of how representations change with experience, can explain the major empirical effects in the literature (similarity, familiarity, past experience, explicit teaching, and salience). It can also predict a variety of empathy disorders. The interaction between the PAM and prefrontal functioning can also explain different levels of empathy across species and age groups. This view can advance our evolutionary understanding of empathy beyond inclusive fitness and reciprocal altruism and can explain different levels of empathy across individuals, species, stages of development, and situations.  
  Address University of Iowa Hospital and Clinics, 2RCP-Neurology Clinic, Iowa City, IA 52242. stephanie-d-preston@uiowa.edu  
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  Series Volume Series Issue Edition  
  ISSN 0140-525X ISBN Medium  
  Area Expedition Conference  
  Notes PMID:12625087 Approved no  
  Call Number refbase @ user @ Serial 181  
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