| Records |
Author  |
Dyer, F. C. |
| Title |
Individual cognition and group movement: insights from social insects. |
Type |
Book Chapter |
| Year |
2000 |
Publication |
Group Movement in Social Primates and Other Animals: Patterns, Processes, and Cognitive Implications. |
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University of Chicago Press |
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Chicago |
Editor |
Garber, P.;Boinski, S. |
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Equine Behaviour @ team @ |
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4425 |
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| Author |
Emery, N.J. |
| Title |
The eyes have it: the neuroethology, function and evolution of social gaze |
Type |
Journal Article |
| Year |
2000 |
Publication |
Neuroscience and Biobehavioral Reviews |
Abbreviated Journal |
Neurosci Biobehav Rev |
| Volume |
24 |
Issue |
6 |
Pages |
581-604 |
| Keywords |
Animals; *Eye; Fixation, Ocular; Humans; *Social Behavior |
| Abstract |
Gaze is an important component of social interaction. The function, evolution and neurobiology of gaze processing are therefore of interest to a number of researchers. This review discusses the evolutionary role of social gaze in vertebrates (focusing on primates), and a hypothesis that this role has changed substantially for primates compared to other animals. This change may have been driven by morphological changes to the face and eyes of primates, limitations in the facial anatomy of other vertebrates, changes in the ecology of the environment in which primates live, and a necessity to communicate information about the environment, emotional and mental states. The eyes represent different levels of signal value depending on the status, disposition and emotional state of the sender and receiver of such signals. There are regions in the monkey and human brain which contain neurons that respond selectively to faces, bodies and eye gaze. The ability to follow another individual's gaze direction is affected in individuals with autism and other psychopathological disorders, and after particular localized brain lesions. The hypothesis that gaze following is “hard-wired” in the brain, and may be localized within a circuit linking the superior temporal sulcus, amygdala and orbitofrontal cortex is discussed. |
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Center for Neuroscience, Department of Psychiatry & California Regional Primate Research Center, University of California, Davis, CA 95616, USA. njemery@ucdavis.edu |
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English |
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0149-7634 |
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PMID:10940436 |
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no |
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refbase @ user @ |
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3996 |
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| Author |
Engh, A.L.; Esch, K.; Smale, L.; Holekamp, K.E. |
| Title |
Mechanisms of maternal rank 'inheritance' in the spotted hyaena, Crocuta crocuta |
Type |
Journal Article |
| Year |
2000 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
60 |
Issue |
3 |
Pages |
323-332 |
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| Abstract |
Maternal rank [`]inheritance', the process by which juveniles attain positions in the dominance hierarchy adjacent to those of their mothers, occurs in both cercopithecine primates and spotted hyaenas. Maternal rank is acquired in primates through defensive maternal interventions, coalitionary support and unprovoked aggression ([`]harassment') directed by adult females towards offspring of lower-ranking individuals. Genetic heritability of rank-related traits plays a negligible role in primate rank acquisition. Because the social lives of Crocuta and cercopithecine primates share many common features, we examined whether the same mechanisms might operate in both taxa to promote maternal rank [`]inheritance'. We observed a large clan of free-living spotted hyaenas in Kenya to test predictions of four mechanistic hypotheses. Hyaena rank acquisition did not appear to be directly affected by genetic heritability. Unprovoked aggression from adult female hyaenas was not directed preferentially towards low-ranking cubs. However, high-ranking mothers intervened on behalf of their cubs more frequently and more effectively than low-ranking mothers. Maternal interventions and supportive coalitions appeared to reinforce aggression directed at [`]appropriate' conspecific targets, whereas coalitionary aggression directed at cubs apparently functioned to extinguish their aggressive behaviour towards [`]inappropriate' targets. Young hyaenas and primates thus appear to [`]inherit' their mothers' ranks by strikingly similar mechanisms. |
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0003-3472 |
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Equine Behaviour @ team @ |
Serial |
5242 |
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| Author |
Fischer, J.; Cheney, D.L.; Seyfarth, R.M. |
| Title |
Development of infant baboons' responses to graded bark variants |
Type |
Journal Article |
| Year |
2000 |
Publication |
Proceedings. Biological sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
| Volume |
267 |
Issue |
1459 |
Pages |
2317-2321 |
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*Animal Communication; Animals; Behavior, Animal; Female; Male; Models, Psychological; Papio/growth & development/*physiology; *Vocalization, Animal |
| Abstract |
We studied the development of infant baboons' (Papio cynocephalus ursinus) responses to conspecific 'barks' in a free-ranging population in the Okavango Delta, Botswana. These barks grade from tonal, harmonically rich calls into calls with a more noisy, harsh structure. Typically, tonal variants are given when the signaller is at risk of losing contact with the group or a particular individual ('contact barks'), whereas harsh variants are given in response to predators ('alarm barks'). We conducted focal observations and playback experiments in which we presented variants of barks recorded from resident adult females. By six months of age, infants reliably discriminated between typical alarm and contact barks and they responded more strongly to intermediate alarm calls than to typical contact barks. Infants of six months and older also recognized their mothers by voice. The ability to discriminate between different call variants developed with increasing age. At two and a half months of age, infants failed to respond at all, whereas at four months they responded irrespective of the call type that was presented. At six months, infants showed adult-like responses by responding strongly to alarm barks but ignoring contact barks. We concluded that infants gradually learn to attach the appropriate meaning to alarm and contact barks. |
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Department of Psychology, University of Pennsylvania, 3815 Walnut Street, Philadelphia, PA 19104, USA. fischerj@eva.mpg.de |
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0962-8452 |
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PMID:11413649 |
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no |
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refbase @ user @ |
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694 |
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| Author |
Forkman, B. |
| Title |
Domestic hens have declarative representations |
Type |
Journal Article |
| Year |
2000 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
| Volume |
3 |
Issue |
3 |
Pages |
135-137 |
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It is generally considered that information can be stored either as a procedural or as a declarative representation. A devaluation technique was used to determine whether hens have declarative representations. Individual hens (Gallus gallus domesticus) were fed in an enclosure with two containers, each with a new food type. One of the food types was devalued by pre-feeding with that food, after which the hens were tested with empty food containers. The pre-feeding should only affect the choice of the hens if they have learned where a particular food type was (declarative representation) rather than “go left when coming into the enclosure” (procedural representation). A significant proportion of the hens went to the location previously occupied by the non-devalued food (seven out of eight). This supports the hypothesis that domestic hens can form declarative representations. |
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Equine Behaviour @ team @ |
Serial |
3143 |
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| Author |
Foster, K.R.; Ratnieks, F.L.W. |
| Title |
Social insects: Facultative worker policing in a wasp |
Type |
Journal Article |
| Year |
2000 |
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Nature |
| Volume |
407 |
Issue |
6805 |
Pages |
692-693 |
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Kin-selection theory predicts that in social-insect colonies where the queen has mated multiple times, the workers will enforce cooperation by policing each other's reproduction1, 2, 3, 4. We have discovered a species, the wasp Dolichovespula saxonica, in which some queens mate once and others mate many times, and in which workers frequently attempt reproduction, allowing this prediction to be tested directly. We find that multiple mating by the queen leads to mutual policing by workers, whereas single mating does not. |
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Macmillan Magazines Ltd. |
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0028-0836 |
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10.1038/35037665 |
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Equine Behaviour @ team @ |
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4940 |
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Fritz, J.; Bisenberger, A.; Kotrschal, K. |
| Title |
Stimulus enhancement in greylag geese: socially mediated learning of an operant task |
Type |
Journal Article |
| Year |
2000 |
Publication |
Animal Behaviour |
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| Volume |
59 |
Issue |
6 |
Pages |
1119-1125 |
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We recently observed the spreading of a novel tradition in a flock of semiferal greylag geese, Anser anser: an increasing number of individuals began to bite and chew the stems of butterbur, Petasites hybridus. Because this behaviour spread particularly fast within families, social learning seemed to be involved. We therefore designed an experiment with hand-reared goslings, which were socially imprinted on humans, to investigate whether and how the observation of an experienced tutor affects the acquisition of a novel skill. Goslings had to open the gliding lid of a box to get at a food reward. To each of seven hand-reared observers a human tutor demonstrated where and how to open the lid, whereas seven controls remained untutored. All observers learned to perform the task but only one of the controls succeeded. The observers explored more often at the position shown by the tutor than elsewhere and seemingly learned by trial and error. In contrast, control birds explored primarily at positions that did not allow them to open the box. These results indicate that in greylag goslings the observation of an experienced model facilitates the learning of an operant task. We conclude that stimulus enhancement followed by operant conditioning were the mechanisms involved, which may have accounted for the fast spread of the stem-chewing tradition between family members. |
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0003-3472 |
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no |
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Equine Behaviour @ team @ |
Serial |
5962 |
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| Author |
Gangemi, A.; Pisanelli, D.M.; Steve, G. |
| Title |
Understanding systematic conceptual structures in polysemous medical terms |
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Journal Article |
| Year |
2000 |
Publication |
Proceedings / AMIA ... Annual Symposium. AMIA Symposium |
Abbreviated Journal |
Proc AMIA Symp |
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Pages |
285-289 |
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*Linguistics; *Terminology; Vocabulary, Controlled |
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Polysemy is a bottleneck for the demanding needs of semantic data management. We suggest the importance of a well-founded conceptual analysis for understanding some systematic structures underlying polysemy in the medical lexicon. We present some cases studies, which exploit the methods (ontological integration and general theories) and tools (description logics and ontology libraries) of the ONIONS methodology defined elsewhere by the authors. This paper addresses an aspect (systematic metomymies) of the project we are involved in, which investigates the feasibility of building a large-scale ontology library of medicine that integrates the most important medical terminology banks. |
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Istituto di Tecnologie Biomediche, CNR Roma, Italy |
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English |
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1531-605X |
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PMID:11079890 |
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no |
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refbase @ user @ |
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613 |
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| Author |
Garber, P.; Boinski, S. |
| Title |
Group Movement in Social Primates and Other Animals: Patterns, Processes, and Cognitive Implications. |
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Book Whole |
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2000 |
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University of Chicago Press |
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Chicago |
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Equine Behaviour @ team @ |
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5466 |
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Goncalves, D.M.; Oliveira, R.F.; Korner, K.; Poschadel, J.R.; Schlupp, I. |
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Using video playbacks to study visual communication in a marine fish, Salaria pavo |
Type |
Journal Article |
| Year |
2000 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
60 |
Issue |
3 |
Pages |
351-357 |
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| Abstract |
Video playbacks have been successfully applied to the study of visual communication in several groups of animals. However, this technique is controversial as video monitors are designed with the human visual system in mind. Differences between the visual capabilities of humans and other animals will lead to perceptually different interpretations of video images. We simultaneously presented males and females of the peacock blenny, Salaria pavo, with a live conspecific male and an online video image of the same individual. Video images failed to elicit appropriate responses. Males were aggressive towards the live male but not towards video images of the same male. Similarly, females courted only the live male and spent more time near this stimulus. In contrast, females of the gynogenetic poecilid Poecilia formosa showed an equal preference for a live and video image of a P. mexicana male, suggesting a response to live animals as strong as to video images. We discuss differences between the species that may explain their opposite reaction to video images. |
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refbase @ user @ |
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541 |
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