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Tang, A.C.; Reeb, B.C.; Romeo, R.D.; McEwen, B.S. |
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Title |
Modification of Social Memory, Hypothalamic-Pituitary-Adrenal Axis, and Brain Asymmetry by Neonatal Novelty Exposure |
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Journal Article |
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Year |
2003 |
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The Journal of Neuroscience |
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23 |
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23 |
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8254-8260 |
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Although corticosterone (a stress hormone) is known to influence social behavior and memory processes, little has been explored concerning its modulatory role in social recognition. In rats, social recognition memory for conspecifics typically lasts <2 hr when evaluated using a habituation paradigm. Using neonatal novelty exposure, a brief and transient early life stimulation method known to produce long-lasting changes in the hypothalamic-pituitary-adrenal axis, we found that social recognition memory was prolonged to at least 24 hr during adulthood. This prolonged social memory was paralleled by a reduction in the basal blood concentration of corticosterone. The same neonatal stimulation also resulted in a functional asymmetry expressed as a greater right-turn preference in a novel environment. Rats that preferred to turn right showed better social recognition memory. These inter-related changes in basal blood corticosterone concentration, turning asymmetry, and social recognition memory suggest that stress hormones and brain asymmetry are likely candidates for modulating social memory. Furthermore, given that neonatal stimulation has been shown to improve learning and memory performance primarily under aversive learning situations, the neonatal novelty exposure-induced enhancement in social recognition broadens the impact of early life stimulation to include the social domain. |
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Equine Behaviour @ team @ |
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5754 |
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Author |
Cheung, K.; Hume, P.A.; Maxwell, L. |
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Title |
Delayed Onset Muscle Soreness |
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Journal Article |
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Year |
2003 |
Publication |
Sports Medicine |
Abbreviated Journal |
Sports Med |
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33 |
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2 |
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145-164 |
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Delayed onset muscle soreness (DOMS) is a familiar experience for the elite or novice athlete. Symptoms can range from muscle tenderness to severe debilitating pain. The mechanisms, treatment strategies, and impact on athletic performance remain uncertain, despite the high incidence of DOMS. DOMS is most prevalent at the beginning of the sporting season when athletes are returning to training following a period of reduced activity. DOMS is also common when athletes are first introduced to certain types of activities regardless of the time of year. Eccentric activities induce micro-injury at a greater frequency and severity than other types of muscle actions. The intensity and duration of exercise are also important factors in DOMS onset. Up to six hypothesised theories have been proposed for the mechanism of DOMS, namely: lactic acid, muscle spasm, connective tissue damage, muscle damage, inflammation and the enzyme efflux theories. However, an integration of two or more theories is likely to explain muscle soreness. DOMS can affect athletic performance by causing a reduction in joint range of motion, shock attenuation and peak torque. Alterations in muscle sequencing and recruitment patterns may also occur, causing unaccustomed stress to be placed on muscle ligaments and tendons. These compensatory mechanisms may increase the risk of further injury if a premature return to sport is attempted. |
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1179-2035 |
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Equine Behaviour @ team @ Cheung2003 |
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6016 |
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Day, R.L.; Coe, R.L.; Kendal, J.R.; Laland, K.N. |
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Title |
Neophilia, innovation and social learning: a study of intergeneric differences in callitrichid monkeys |
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Journal Article |
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2003 |
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Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
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65 |
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3 |
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559-571 |
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In a comparative study of neophilia, innovation and social attentiveness we exposed individuals in seven callitrichid species, from three genera, to novel extractive foraging tasks. The results revealed consistently shorter response latencies, higher levels of successful and unsuccessful manipulation, and greater attentiveness to the task and to conspecifics inLeontopithecus (lion tamarins) than in both Saguinus (tamarins) and Callithrix (marmosets). This is consistent with the hypothesis that species dependent upon manipulative and explorative foraging tend to be less neophobic and more innovative than other species. Furthermore, Callithrix appeared to be less neophobic than Saguinus; ifCallithrix is regarded as the greater specialist, this result is inconsistent with the hypothesis that neophobia is associated with foraging specialization. We consider the relevance of our findings to taxonomic relationships, and to technical and Machiavellian intelligence hypotheses and discuss the implications for captive breeding and reintroduction strategies.Copyright 2003 Published by Elsevier Science Ltd on behalf of The Association for the Study of Animal Behaviour. |
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0003-3472 |
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Equine Behaviour @ team @ |
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6035 |
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Author |
Reader, S.M.; Kendal, J.R.; Laland, K.N. |
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Title |
Social learning of foraging sites and escape routes in wild Trinidadian guppies |
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Journal Article |
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Year |
2003 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
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66 |
Issue |
4 |
Pages |
729-739 |
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We describe two field experiments with wild guppies, Poecilia reticulata, in Trinidad that demonstrated that guppies can acquire foraging and predator escape-response information from conspecifics. In the foraging experiment, subjects were presented with two distinctly marked feeders in their home rivers. One feeder contained a conspecific shoal in a transparent container. Guppies preferred to enter the feeder containing this artificial shoal over the other feeder. In a test phase, the artificial shoal was removed and the feeders replaced at the testing site after a 5-min delay. More guppies entered the feeder that had contained the artificial shoal over the other feeder, a difference that can be explained only by the fish learning the characteristics or location of the feeder during the training phase. We suggest that subjects acquired a foraging patch preference through a propensity to approach feeding conspecifics, a local enhancement process. In the predator escape-response experiment, naive 'observer' guppies could avoid an approaching trawl net by escaping through either a hole to which 'demonstrator' guppies had been trained or through an alternative hole. When the demonstrators were present, the naive observers escaped more often and more rapidly by the demonstrated route than the alternative route. When the demonstrators were removed, observers maintained a route preference according to the training of their demonstrators, which suggests that the observers had learned an escape route through following or observing their more knowledgeable conspecifics. Thus, both experiments reveal that guppies can socially learn in the wild. Copyright 2003 Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour. |
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0003-3472 |
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Equine Behaviour @ team @ |
Serial |
6163 |
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Author |
Young, R.J. |
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Title |
Environmental Enrichment for Captive Animals |
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Book Whole |
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2003 |
Publication |
Wiley Interdiscip Rev Cogn Sci |
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Environmental enrichment is a simple and effective means of improving animal welfare in any species – companion, farm, laboratory and zoo. For many years, it has been a popular area of research, and has attracted the attention and concerns of animal keepers and carers, animal industry professionals, academics, students and pet owners all over the world. |
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Equine Behaviour @ team @ |
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6596 |
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Author |
Couzin, I.D.; Krause, J. |
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Title |
Self-Organization and Collective Behavior in Vertebrates |
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Book Chapter |
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2003 |
Publication |
Advances in the Study of Behavior |
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32 |
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1-75 |
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Academic Press |
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Peter J. B. Slater, J.S.R., Charles T. Snowdon and Timothy J. Roper |
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0065-3454 |
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Equine Behaviour @ team @ |
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5144 |
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Author |
Singh,M.; Singh,M.; Sharma, A. K.; Krishna B. A. |
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Title |
Methodological considerations in measurement of dominance in primates |
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Journal Article |
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2003 |
Publication |
CURRENT SCIENCE |
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CURRENT SCIENCE |
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84 |
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5 |
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709-713 |
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Abstract |
The strength of dominance hierarchy in a group of
animals needs to be quantitatively measured since it
influences many other aspects of social interactions.
This article discusses three attempts made by previous
researchers to measure the strength of hierarchy. We
propose a method which attempts to rectify the lacunae
in the previous attempts. Data are used from a
group of Japanese macaques housed in a colony. A
method to calculate strength of hierarchy has been
illustrated and a procedure has been suggested to
normalize the dominance scores in order to place the
ranks of individuals on an interval scale. |
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Biopsychology Laboratory, Department of Psychology, University of Mysore, Mysore 570 006, India |
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Equine Behaviour @ team @ |
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2860 |
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Author |
de Villiers, M.S.; Richardson, P.R.K.; van Jaarsveld, A.S. |
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Title |
Patterns of coalition formation and spatial association in a social carnivore, the African wild dog (Lycaon pictus) |
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Journal Article |
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2003 |
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Journal of Zoology |
Abbreviated Journal |
J Zool |
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260 |
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4 |
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377-389 |
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coalitions; social systems; Carnivora; Lycaon pictus |
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In many social species, relationships within groups seem to be non-random but related to variables such as rank, kinship or sexual attractiveness. The endangered African wild dog Lycaon pictus is a social carnivore that lives in large, stable packs, and intra-pack associations might be expected to display similar patterns. We investigated patterns of coalition formation (support during dominance interactions, and partnership interactions) and resting associations between members of a captive pack of 19 wild dogs. The social organization of the captive pack was similar to that of free-ranging packs in many respects. Polyadic (group) incidents of coalition support were also observed in a free-ranging pack. Patterns of coalition formation in the captive pack were related to rank. Most aggressive interactions involved high-ranking individuals (particularly the alpha, beta and third-ranking males) and coalitionary support tended to reinforce the existing hierarchy. However, there was at least one example of support influencing a successful rank challenge. Support was affected by potential risks and benefits, the latter including dominance through association and revolutionary alliances. An even stronger pattern overlaid associations between pack members: coalitions and resting associations were strongest between members of the same age–sex cohort, and may have enabled the eventual dominance of younger pack members over adults. Among adults, coalitionary associations were sometimes overridden by intersexual relationships. The results from this captive pack suggest that wild dogs are sensitive to differences in competitive ability. This information, in conjunction with strong affiliative bonds between littermates, is used to manoeuvre for position in the social hierarchy. It may also be important during dispersal, in encounters with other dispersing groups of the same sex. Although most features of the social structure of the captive pack were comparable to those of free-ranging packs, aspects such as the influence of relatedness on coalition formation still need to be explored. |
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Blackwell Publishing Ltd |
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1469-7998 |
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Equine Behaviour @ team @ |
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5249 |
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Author |
Pusey, A. E.; Packer, C. |
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Title |
The Ecology of relationships |
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2003 |
Publication |
Behavioural Ecology |
Abbreviated Journal |
Behav. Ecol. |
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254 -283 |
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Blackwell Scientific Publication |
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Oxford |
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Krebs, J.R.; Davis, N.B.; |
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refbase @ user @ |
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820 |
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Author |
Lefebvre, L.; Bouchard, J. |
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Title |
Social learning about food in birds |
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Book Chapter |
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2003 |
Publication |
The Biology of Traditions |
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94-126 |
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Cambridge University Press |
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Cambridge |
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Fragaszy, D.M; Perry, S. |
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Englisch |
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978-0521815970 |
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Equine Behaviour @ team @ |
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5471 |
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