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Author |
Noë, R.; Hammerstein, P. |
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Title |
Biological markets |
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1995 |
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Trends in Ecology & Evolution |
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Trends. Ecol. Evol |
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10 |
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8 |
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336-339 |
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In biological markets, two classes of traders exchange commodities to their mutual benefit. Characteristics of markets are: competition within trader classes by contest or outbidding; preference for partners offering the highest value; and conflicts over the exchange value of commodities. Biological markets are currently studied under at least three different headings: sexual selection, intraspecific cooperation and interspecific mutualism. The time is ripe for the development of game theoretic models that describe the common core of biological markets and integrate existing knowledge from the separate fields. |
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0169-5347 |
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Equine Behaviour @ team @ |
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4993 |
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Clutton-Brock, T.H.; Parker, G.A. |
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Title |
Punishment in animal societies |
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1995 |
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Nature |
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373 |
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6511 |
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209-216 |
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Although positive reciprocity (reciprocal altruism) has been a focus of interest in evolutionary biology, negative reciprocity (retaliatory infliction of fitness reduction) has been largely ignored. In social animals, retaliatory aggression is common, individuals often punish other group members that infringe their interests, and punishment can cause subordinates to desist from behaviour likely to reduce the fitness of dominant animals. Punishing strategies are used to establish and maintain dominance relationships, to discourage parasites and cheats, to discipline offspring or prospective sexual partners and to maintain cooperative behaviour. |
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10.1038/373209a0 |
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Equine Behaviour @ team @ |
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4838 |
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Author |
Dey, S. |
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Title |
Trailer accidents |
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1995 |
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Journal of Equine Veterinary Science |
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15 |
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4 |
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148-149 |
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Equine Behaviour @ team @ |
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4662 |
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Miller, R.M. |
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How the dominance hierarchy is determined: The body language of the horse |
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1995 |
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Journal of Equine Veterinary Science |
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15 |
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12 |
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514-515 |
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Equine Behaviour @ team @ |
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4306 |
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Author |
Kasuya,Eiiti |
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Title |
A randomization test for linearity of dominance hierarchies |
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Year |
1995 |
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Journal of Ethology |
Abbreviated Journal |
J. Ethol. |
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13 |
Issue |
1 |
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137-140 |
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Equine Behaviour @ team @ |
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4288 |
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Author |
de Vries, H. |
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Title |
An improved test of linearity in dominance hierarchies containing unknown or tied relationships |
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Journal Article |
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Year |
1995 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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50 |
Issue |
5 |
Pages |
1375-1389 |
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Appleby (1983, Anim. Behav., 31, 600-608) described a statistical test, based on the work of Kendall (1962, Rank Correlation Methods), for the significance of linearity in dominance hierarchies. He suggested that unknown relationships should be assigned the value 1/2 and that subsequently the same test procedure can be used. In this paper it is shown that incorrect results are obtained by this method whenever there are unknown relationships. Values of the linearity index are systematically too low. P-values can be too high (underestimating the significance) or too low (overestimating), and seem to differ by not much more than a factor two (respectively a half) from the correct P-value. An improved method is developed for testing linearity in a set of dominance relationships containing unknown relationships. Furthermore, it is argued that, if one admits the possibility of tied dominance relationships, which should indeed be assigned the value 1/2, Landau's linearity index is to be preferred to Kendall's index. A randomization test is developed for assessing the significance of linearity or non-linearity in a set of dominance relationships containing unknown or tied relationships. The test statistic employed in this testing procedure is based on Landau's linearity index, but takes the unknown and tied relationships into account. |
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Equine Behaviour @ team @ |
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4284 |
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Boyd, R.; Richerson, P.J. |
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Title |
Why does culture increase human adaptability? |
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Journal Article |
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Year |
1995 |
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Ethology and Sociobiology |
Abbreviated Journal |
Ethol. a. Sociob. |
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16 |
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2 |
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125-143 |
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Social learning; Adaptation; Culture; Sociobiology |
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It is often argued that culture is adaptive because it allows people to acquire useful information without costly learning. In a recent paper Rogers (1989) analyzed a simple mathematical model that showed that this argument is wrong. Here we show that Rogers' result is robust. As long as the only benefit of social learning is that imitators avoid learning costs, social learning does not increase average fitness. However, we also show that social learning can be adaptive if it makes individual learning more accurate or less costly. |
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Equine Behaviour @ team @ |
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4196 |
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Author |
Marten, K.; Psarakos, S. |
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Title |
Using self-view television to distinguish between self-examination and social behavior in the bottlenose dolphin (Tursiops truncatus) |
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Year |
1995 |
Publication |
Consciousness and Cognition |
Abbreviated Journal |
Conscious Cogn |
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4 |
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2 |
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205-224 |
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Animal Communication; Animals; *Attention; Discrimination Learning; Dolphins/*psychology; Female; Male; *Self Concept; *Social Behavior; *Television; *Visual Perception |
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In mirror mark tests dolphins twist, posture, and engage in open-mouth and head movements, often repetitive. Because postures and an open mouth are also dolphin social behaviors, we used self-view television as a manipulatable mirror to distinguish between self-examination and social behavior. Two dolphins were exposed to alternating real-time self-view (“mirror mode”) and playback of the same to determine if they distinguished between them. The adult male engaged in elaborate open-mouth behaviors in mirror mode, but usually just watched when played back the same material. Mirror mode behavior was also compared to interacting with real dolphins (controls). Mark tests were conducted, as well as switches from front to side self-views to see if the dolphins turned. They presented marked areas to the self-view television and turned. The results suggest self-examination over social behavior. |
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Earthtrust, Kailua, Hawaii 96734, USA |
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1053-8100 |
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PMID:8521259 |
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Equine Behaviour @ team @ |
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4164 |
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Author |
Anderson, J.R. |
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Self-recognition in dolphins: credible cetaceans; compromised criteria, controls, and conclusions |
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1995 |
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Consciousness and Cognition |
Abbreviated Journal |
Conscious Cogn |
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4 |
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2 |
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239-243 |
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Animal Communication; Animals; *Awareness; Discrimination Learning; Dolphins/*psychology; Female; Male; Orientation; *Self Concept; Social Behavior; *Television; *Visual Perception |
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Laboratoire de Psychophysiologie, CNRS URA 1295, Universite Louis Pasteur, Strasbourg, France |
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1053-8100 |
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PMID:8521263 |
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Equine Behaviour @ team @ |
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4163 |
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Hart, D.; Whitlow, J.W.J. |
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Title |
The experience of self in the bottlenose dolphin |
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1995 |
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Consciousness and Cognition |
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Conscious Cogn |
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4 |
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2 |
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244-247 |
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Animal Communication; Animals; *Awareness; Body Image; Dolphins/*psychology; Female; Humans; Male; *Self Concept; Social Behavior; Species Specificity; *Television; *Visual Perception |
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Marten and Psarakos have presented some evidence which suggests that objective self-awareness and possibly representations of self may characterize the dolphins' experience of self. Their research demonstrates the possibility of similarities in the sense of self between primate species and dolphins, although whether dolphins have subjective self-awareness, personal memories, and theories of self--all important facets of the sense of self in humans--was not examined. Clearly, even this limited evidence was difficult to achieve; the difficulties in adapting methods and coding behavior are quite apparent in their report. Future progress, however, may depend upon clarification of what are the necessary components for a sense of self and an explication of how these might be reflected in dolphin behavior. We are mindful of the authors' point (pp. 219 and 220) that the dolphin lives more in an acoustic than a visual environment. Thus, while tasks relying upon vision may reveal the presence or absence of the sense of self in primates, it might well be the case that in dolphins self-related experiences might be better revealed in auditory tasks. But then, what is the nature of human self-awareness in terms of audition? While both conceptual and methodological hurdles remain, Marten and Psarakos have demonstrated that important questions can be asked about the minds and phenomenal worlds of nonanthropoid species. |
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Department of Psychology, Rutgers University, Camden, New Jersey 08102, USA |
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1053-8100 |
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PMID:8521264 |
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Equine Behaviour @ team @ |
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4162 |
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