| Records |
| Author |
Tiefenbacher, S.; Lee, B.; Meyer, J.S.; Spealman, R.D. |
| Title |
Noninvasive technique for the repeated sampling of salivary free cortisol in awake, unrestrained squirrel monkeys |
Type |
Journal Article |
| Year |
2003 |
Publication |
American Journal of Primatology |
Abbreviated Journal |
Am. J. Primatol. |
| Volume |
60 |
Issue |
2 |
Pages |
69-75 |
| Keywords |
saliva; cortisol; squirrel monkey; sampling technique; Hpa |
| Abstract |
The use of noninvasive measures of hypothalamic-pituitary-adrenal (HPA) axis function is of growing interest among preclinical and clinical investigators. This report describes a method for the repeated assessment of salivary free cortisol in awake, unrestrained squirrel monkeys (Saimiri sciureus) based on a saliva sampling technique previously developed for rhesus monkeys. Individually housed adult male squirrel monkeys were trained to chew on dental rope attached to a pole, from which saliva was extracted by centrifugation and analyzed for cortisol by radioimmunoassay (RIA). Eight of nine monkeys readily acquired the task, reliably providing adequate saliva samples for the assay. Salivary free cortisol levels were examined in these subjects under basal conditions and in response to two types of neuroendocrine challenge. Levels of salivary free cortisol showed relatively low intra- and interindividual variability, with mean individual morning levels ranging between 17.1 and 37.9 µg/dl. Squirrel monkeys demonstrated a consistent daily rhythm in salivary free cortisol ranging from a high of 27.4 ± 5.2 µg/dl (mean ± SEM) at 12 P.M. to a low of 7.5 ± 1.6 µg/dl at 6 P.M.. Intravenous (IV) challenges with 1 µg/kg ACTH, or 10 and 50 µg/kg CRF resulted in significant increases in salivary free cortisol. The described sampling technique provides a reliable and sensitive means for repeated measurement of HPA activity in unrestrained, awake squirrel monkeys. In addition, our findings illustrate several features of HPA system rhythmicity and reactivity using salivary cortisol instead of blood plasma or serum. Am. J. Primatol. 60:69–75, 2003. © 2003 Wiley-Liss, Inc. |
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Wiley Subscription Services, Inc., A Wiley Company |
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1098-2345 |
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Equine Behaviour @ team @ |
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5573 |
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| Author |
Galef, G.G. Jr. |
| Title |
Social learning: promotor or inhibitor of innovation? |
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Book Chapter |
| Year |
2003 |
Publication |
Animal Intelligence |
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Oxford University Press |
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Oxford |
Editor |
Reader, S.M.; Laland, K. N. |
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Equine Behaviour @ team @ |
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5750 |
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| Author |
Tang, Akaysha C. |
| Title |
A hippocampal theory of cerebral lateralization. |
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Book Chapter |
| Year |
2003 |
Publication |
The asymmetrical brain |
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37-68 |
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MIT Press |
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Massechusetts |
Editor |
Hugdahl K. and Davidson R.J. |
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0-262-58254-6 |
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Equine Behaviour @ team @ |
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5753 |
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| Author |
Tang, A.C.; Reeb, B.C.; Romeo, R.D.; McEwen, B.S. |
| Title |
Modification of Social Memory, Hypothalamic-Pituitary-Adrenal Axis, and Brain Asymmetry by Neonatal Novelty Exposure |
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Journal Article |
| Year |
2003 |
Publication |
The Journal of Neuroscience |
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23 |
Issue |
23 |
Pages |
8254-8260 |
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| Abstract |
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. |
| Title |
Delayed Onset Muscle Soreness |
Type |
Journal Article |
| Year |
2003 |
Publication |
Sports Medicine |
Abbreviated Journal |
Sports Med |
| Volume |
33 |
Issue |
2 |
Pages |
145-164 |
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| Abstract |
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 |
Serial |
6016 |
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| Author |
Day, R.L.; Coe, R.L.; Kendal, J.R.; Laland, K.N. |
| Title |
Neophilia, innovation and social learning: a study of intergeneric differences in callitrichid monkeys |
Type |
Journal Article |
| Year |
2003 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
| Volume |
65 |
Issue |
3 |
Pages |
559-571 |
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| Abstract |
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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Reader, S.M.; Kendal, J.R.; Laland, K.N. |
| Title |
Social learning of foraging sites and escape routes in wild Trinidadian guppies |
Type |
Journal Article |
| Year |
2003 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
| Volume |
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 @ |
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6163 |
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| Author |
Reader, S. M.; Laland, K.N. |
| Title |
Animal Innovation |
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Book Whole |
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2003 |
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Oxford University Press |
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Oxford |
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Equine Behaviour @ team @ |
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6531 |
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| Author |
Sol, D. |
| Title |
Behavioural flexibility: a neglected issue in the ecological and evolutionary literature |
Type |
Book Chapter |
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2003 |
Publication |
Animal innovation. |
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63-82 |
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Oxford University Press |
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Oxford |
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S. M. Reader and K. N. Laland |
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Equine Behaviour @ team @ |
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6532 |
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| Author |
Lee, P.C. |
| Title |
Innovation as a behavioural response to environmental challenges |
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Book Chapter |
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2003 |
Publication |
Animal Innovation |
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261-279 |
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Oxford University Press |
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Oxford |
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S. M. Reader and K. N. Laland |
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Equine Behaviour @ team @ |
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6534 |
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