| Records |
| Author |
Zhou, W.-X.; Sornette, D.; Hill, R.A.; Dunbar, R.I.M. |
| Title |
Discrete hierarchical organization of social group sizes |
Type  |
Journal Article |
| Year |
2005 |
Publication |
Proceedings. Biological sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
| Volume |
272 |
Issue |
1561 |
Pages |
439-444 |
| Keywords |
Anthropology, Cultural; *Group Structure; Humans; *Models, Biological; *Social Behavior; *Social Environment |
| Abstract |
The 'social brain hypothesis' for the evolution of large brains in primates has led to evidence for the coevolution of neocortical size and social group sizes, suggesting that there is a cognitive constraint on group size that depends, in some way, on the volume of neural material available for processing and synthesizing information on social relationships. More recently, work on both human and non-human primates has suggested that social groups are often hierarchically structured. We combine data on human grouping patterns in a comprehensive and systematic study. Using fractal analysis, we identify, with high statistical confidence, a discrete hierarchy of group sizes with a preferred scaling ratio close to three: rather than a single or a continuous spectrum of group sizes, humans spontaneously form groups of preferred sizes organized in a geometrical series approximating 3-5, 9-15, 30-45, etc. Such discrete scale invariance could be related to that identified in signatures of herding behaviour in financial markets and might reflect a hierarchical processing of social nearness by human brains. |
| Address |
State Key Laboratory of Chemical Reaction Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Language |
English |
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Edition |
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| ISSN |
0962-8452 |
ISBN |
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Expedition |
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Conference |
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| Notes |
PMID:15734699 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
549 |
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| Author |
Janik, V.M. |
| Title |
Whistle matching in wild bottlenose dolphins (Tursiops truncatus) |
Type |
Journal Article |
| Year |
2000 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
289 |
Issue |
5483 |
Pages |
1355-1357 |
| Keywords |
Animals; Animals, Wild/physiology; Dolphins/*physiology; *Imitative Behavior; *Learning; *Social Behavior; *Vocalization, Animal |
| Abstract |
Dolphin communication is suspected to be complex, on the basis of their call repertoires, cognitive abilities, and ability to modify signals through vocal learning. Because of the difficulties involved in observing and recording individual cetaceans, very little is known about how they use their calls. This report shows that wild, unrestrained bottlenose dolphins use their learned whistles in matching interactions, in which an individual responds to a whistle of a conspecific by emitting the same whistle type. Vocal matching occurred over distances of up to 580 meters and is indicative of animals addressing each other individually. |
| Address |
School of Biology, University of St. Andrews, Bute Building, Fife KY16 9TS, UK |
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English |
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| ISSN |
0036-8075 |
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| Notes |
PMID:10958783 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
550 |
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| Author |
Brilot, B.O.; Johnstone, R.A. |
| Title |
The limits to cost-free signalling of need between relatives |
Type |
Journal Article |
| Year |
2003 |
Publication |
Proceedings. Biological sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
| Volume |
270 |
Issue |
1519 |
Pages |
1055-1060 |
| Keywords |
*Animal Communication; Animals; Birds/physiology; Models, Biological; *Social Behavior |
| Abstract |
Theoretical models have demonstrated the possibility of stable cost-free signalling of need between relatives. The stability of these cost-free equilibria depends on the indirect fitness cost of cheating and deceiving a donor into giving away resources. We show that this stability is highly sensitive to the distribution of need among signallers and receivers. In particular, cost-free signalling is likely to prove stable only if there is very large variation in need (such that the least-needy individuals stand to gain much less than the most-needy individuals from additional resources). We discuss whether these conditions are likely to be found in altricial avian breeding systems--the most intensively studied instance of signalling of need between relatives. We suggest that cost-free signalling is more likely to prove stable and will provide parents with more information during the earlier phases of chick growth, when parents can more easily meet the demands of a brood (and chicks are more likely to reach satiation). Later, informative yet cost-free signalling is unlikely to persist. |
| Address |
Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK. bob21@cam.ac.uk |
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English |
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0962-8452 |
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| Notes |
PMID:12803895 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
558 |
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| Author |
Pepperberg, I.M. |
| Title |
In search of king Solomon's ring: cognitive and communicative studies of Grey parrots (Psittacus erithacus) |
Type |
Journal Article |
| Year |
2002 |
Publication |
Brain, behavior and evolution |
Abbreviated Journal |
Brain Behav Evol |
| Volume |
59 |
Issue |
1-2 |
Pages |
54-67 |
| Keywords |
*Animal Communication; Animals; Attention/physiology; Cognition/*physiology; Cues; Form Perception/physiology; Humans; Intelligence; Learning/physiology; Male; Models, Psychological; Parrots/*physiology; Psychomotor Performance/physiology; Reward; Social Behavior |
| Abstract |
During the past 24 years, I have used a modeling technique (M/R procedure) to train Grey parrots to use an allospecific code (English speech) referentially; I then use the code to test their cognitive abilities. The oldest bird, Alex, labels more than 50 different objects, 7 colors, 5 shapes, quantities to 6, 3 categories (color, shape, material) and uses 'no', 'come here', wanna go X' and 'want Y' (X and Y are appropriate location or item labels). He combines labels to identify, request, comment upon or refuse more than 100 items and to alter his environment. He processes queries to judge category, relative size, quantity, presence or absence of similarity/difference in attributes, and show label comprehension. He semantically separates labeling from requesting. He thus exhibits capacities once presumed limited to humans or nonhuman primates. Studies on this and other Greys show that parrots given training that lacks some aspect of input present in M/R protocols (reference, functionality, social interaction) fail to acquire referential English speech. Examining how input affects the extent to which parrots acquire an allospecific code may elucidate mechanisms of other forms of exceptional learning: learning unlikely in the normal course of development but that can occur under certain conditions. |
| Address |
The MIT Media Lab, Cambridge, Mass. 02139, USA. impepper@media.mit.edu |
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English |
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| ISSN |
0006-8977 |
ISBN |
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| Notes |
PMID:12097860 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
579 |
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| Author |
Hare, B.; Plyusnina, I.; Ignacio, N.; Schepina, O.; Stepika, A.; Wrangham, R.; Trut, L. |
| Title |
Social cognitive evolution in captive foxes is a correlated by-product of experimental domestication |
Type |
Journal Article |
| Year |
2005 |
Publication |
Current biology : CB |
Abbreviated Journal |
Curr Biol |
| Volume |
15 |
Issue |
3 |
Pages |
226-230 |
| Keywords |
Animals; *Animals, Domestic; Cognition/*physiology; *Cues; *Evolution; Foxes/*physiology; *Selection (Genetics); Social Behavior; Species Specificity |
| Abstract |
Dogs have an unusual ability for reading human communicative gestures (e.g., pointing) in comparison to either nonhuman primates (including chimpanzees) or wolves . Although this unusual communicative ability seems to have evolved during domestication , it is unclear whether this evolution occurred as a result of direct selection for this ability, as previously hypothesized , or as a correlated by-product of selection against fear and aggression toward humans--as is the case with a number of morphological and physiological changes associated with domestication . We show here that fox kits from an experimental population selectively bred over 45 years to approach humans fearlessly and nonaggressively (i.e., experimentally domesticated) are not only as skillful as dog puppies in using human gestures but are also more skilled than fox kits from a second, control population not bred for tame behavior (critically, neither population of foxes was ever bred or tested for their ability to use human gestures) . These results suggest that sociocognitive evolution has occurred in the experimental foxes, and possibly domestic dogs, as a correlated by-product of selection on systems mediating fear and aggression, and it is likely the observed social cognitive evolution did not require direct selection for improved social cognitive ability. |
| Address |
Department of Anthropology, Harvard University, Cambridge, MA 02138, USA. hare@eva.mpg.de |
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English |
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Series Issue |
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Edition |
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| ISSN |
0960-9822 |
ISBN |
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| Notes |
PMID:15694305 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
594 |
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| Author |
Hare, B.; Brown, M.; Williamson, C.; Tomasello, M. |
| Title |
The domestication of social cognition in dogs |
Type |
Journal Article |
| Year |
2002 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
298 |
Issue |
5598 |
Pages |
1634-1636 |
| Keywords |
Animals; *Animals, Domestic; *Behavior, Animal; *Cognition; *Cues; *Dogs; Food; Humans; Memory; Pan troglodytes; *Social Behavior; Species Specificity; Vision; Wolves |
| Abstract |
Dogs are more skillful than great apes at a number of tasks in which they must read human communicative signals indicating the location of hidden food. In this study, we found that wolves who were raised by humans do not show these same skills, whereas domestic dog puppies only a few weeks old, even those that have had little human contact, do show these skills. These findings suggest that during the process of domestication, dogs have been selected for a set of social-cognitive abilities that enable them to communicate with humans in unique ways. |
| Address |
Department of Anthropology, Harvard University, Cambridge, MA 02138, USA. bhare@fas.harvard.edu |
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English |
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Series Issue |
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Edition |
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| ISSN |
1095-9203 |
ISBN |
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Conference |
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| Notes |
PMID:12446914 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
595 |
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| Author |
Cancedda, M. |
| Title |
[Social and behavioral organization of horses on the Giara (Sardinia): distribution and aggregation] |
Type |
Journal Article |
| Year |
1990 |
Publication |
Bollettino della Societa italiana di biologia sperimentale |
Abbreviated Journal |
Boll Soc Ital Biol Sper |
| Volume |
66 |
Issue |
11 |
Pages |
1089-1096 |
| Keywords |
Animals; *Animals, Wild/physiology/psychology; Environment; Female; *Horses/physiology/psychology; Italy; Male; Population Density; Sexual Behavior, Animal; *Social Behavior; Social Dominance; Water |
| Abstract |
In this paper some considerations on the environment of the 42 Kmq of the volcanic-basaltic Giara tableland are discussed. Conditioning by the environment and its effect on the distribution of a population of 712 horses is illustrated in view of their social and behavioural organization. |
| Address |
Istituto di Fisiologia Generale e Speciale, Universita di Sassari |
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Italian |
Summary Language |
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Original Title |
Introduzione all'organizzazione sociale e comportamentale dei cavallini sulla Giara (Sardegna): distribuzione ed aggregazione |
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Edition |
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| ISSN |
0037-8771 |
ISBN |
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Medium |
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Conference |
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| Notes |
PMID:2095819 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
673 |
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| Author |
Keiper, R.R. |
| Title |
Social structure |
Type |
Journal Article |
| Year |
1986 |
Publication |
The Veterinary clinics of North America. Equine practice |
Abbreviated Journal |
Vet Clin North Am Equine Pract |
| Volume |
2 |
Issue |
3 |
Pages |
465-484 |
| Keywords |
Animal Communication; Animals; Animals, Domestic; Animals, Wild; Dominance-Subordination; Female; *Hierarchy, Social; Homing Behavior; *Horses; Male; Sexual Behavior, Animal; *Social Behavior; *Social Dominance |
| Abstract |
Socially feral horses live in stable social groups characterized by one adult male, a number of adult females, and their offspring up to 2 years of age. Extra males either live by themselves or with other males in bachelor groups. The bands occupy nondefended home ranges that often overlap. Many abnormal behaviors seen in domestic horses occur because some aspect of their normal social behavior cannot be carried out in captivity. |
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English |
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| ISSN |
0749-0739 |
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| Notes |
PMID:3492240 |
Approved |
no |
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refbase @ user @ |
Serial |
675 |
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| Author |
Kiley, M. |
| Title |
The vocalizations of ungulates, their causation and function |
Type |
Journal Article |
| Year |
1972 |
Publication |
Zeitschrift für Tierpsychologie |
Abbreviated Journal |
Z. Tierpsychol. |
| Volume |
31 |
Issue |
2 |
Pages |
171-222 |
| Keywords |
Aggression; Animals; *Artiodactyla; Cattle; Fear; Female; Frustration; Horses; Humans; Male; Pain; *Perissodactyla; Sexual Behavior, Animal; Social Behavior; Social Dominance; Swine; *Vocalization, Animal |
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English |
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| ISSN |
0044-3573 |
ISBN |
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| Notes |
PMID:4674022 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
681 |
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| Author |
Seyfarth, R.M.; Cheney, D.L. |
| Title |
Signalers and receivers in animal communication |
Type |
Journal Article |
| Year |
2003 |
Publication |
Annual review of psychology |
Abbreviated Journal |
Annu Rev Psychol |
| Volume |
54 |
Issue |
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Pages |
145-173 |
| Keywords |
Affect; *Animal Communication; Animals; Arousal; Auditory Perception; Motivation; *Social Behavior; Social Environment; Species Specificity; *Vocalization, Animal |
| Abstract |
In animal communication natural selection favors callers who vocalize to affect the behavior of listeners and listeners who acquire information from vocalizations, using this information to represent their environment. The acquisition of information in the wild is similar to the learning that occurs in laboratory conditioning experiments. It also has some parallels with language. The dichotomous view that animal signals must be either referential or emotional is false, because they can easily be both: The mechanisms that cause a signaler to vocalize do not limit a listener's ability to extract information from the call. The inability of most animals to recognize the mental states of others distinguishes animal communication most clearly from human language. Whereas signalers may vocalize to change a listener's behavior, they do not call to inform others. Listeners acquire information from signalers who do not, in the human sense, intend to provide it. |
| Address |
Department of Psychology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. seyfarth@psych.upenn.edu |
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English |
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Series Issue |
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Edition |
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| ISSN |
0066-4308 |
ISBN |
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Conference |
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| Notes |
PMID:12359915 |
Approved |
no |
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refbase @ user @ |
Serial |
690 |
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