| Records |
| Author |
Pauw, J. |
| Title |
Therapeutic Horseback Riding Studies: Problems Experienced by Researchers |
Type |
Journal Article |
| Year |
2000 |
Publication |
Physiotherapy |
Abbreviated Journal |
Physiotherapy |
| Volume |
86 |
Issue |
10 |
Pages |
523-527 |
| Keywords |
Therapeutic horseback riding; t-tests; logistic regression; statistically significant; clinically meaningful |
| Abstract |
Summary Since the therapeutic use of horse riding has been realised, several research studies investigating the physical and psychosocial effect of therapeutic riding have been conducted. A summary is given of therapeutic riding research studies where formal statistical tests were used to analyse the data as well as a summary of studies where different techniques were used to process the data. These summaries give an overview of the variables measured in previously conducted therapeutic riding studies. The general problems experienced by therapeutic riding researchers are given after the summaries. Possible explanations are discussed for some of these problems. In conclusion a few suggestions are given for future research, not only for therapeutic riding studies, but for any study where the effect of a therapeutic intervention is investigated. |
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0031-9406 |
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Equine Behaviour @ team @ |
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5066 |
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| Author |
Byrne, R.W. |
| Title |
How monkeys find their way: leadership, coordination, and cognitive maps of African baboons. |
Type |
Book Chapter |
| Year |
2000 |
Publication |
On the Move: How and Why Animals Travel in Groups |
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Pages |
491–518 |
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Chicago University Press |
Place of Publication |
Chicago |
Editor |
Boinski, S.; Garber, P.A. |
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Equine Behaviour @ team @ |
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5146 |
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| Author |
Holekamp, K.E, Boydston, E.E; Smale, L. |
| Title |
Group Travel in Social Carnivores |
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Book Whole |
| Year |
2000 |
Publication |
On the Move: How and Why Animals Travel in Groups |
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Issue |
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Pages |
587-627 |
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Chicago University Press |
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Chicago |
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Boinski, S.; Garber, P.A. |
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Equine Behaviour @ team @ |
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5147 |
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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 @ |
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5242 |
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| Author |
Reebs, S.G. |
| Title |
Can a minority of informed leaders determine the foraging movements of a fish shoal? |
Type |
Journal Article |
| Year |
2000 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
59 |
Issue |
2 |
Pages |
403-409 |
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| Abstract |
There is no information on whether the daily foraging movements of fish shoals are the result of chance, the collective will of all shoalmates, or the leadership of a few individuals. This study tested the latter possibility. Shoals of 12 golden shiners, Notemigonus crysoleucas, were trained to expect food around midday in one of the brightly lit corners of their tank. They displayed daily food-anticipatory activity by leaving the shady area of their tank and spending more and more time in the food corner up to the normal time of feeding. Past this normal time they remained in the shade, even on test days when no food was delivered. Most of these experienced individuals were then replaced by naïve ones. The resulting ratio of experienced:naïve fish could be 5:7, 3:9 or 1:11. On their own, naïve individuals would normally spend the whole day in the shade, but in all tests the experienced individual(s) were able to entrain these more numerous naïve fish out of the shade and into the brightly lit food corner at the right time of day. Entrainment was stronger in the 5:7 than in the 1:11 experiment. The test shoals never split up and were always led by the same fish, presumably the experienced individuals. These results indicate that in a strongly gregarious species, such as the golden shiner, a minority of informed individuals can lead a shoal to food, either through social facilitation of foraging movements or by eliciting following behaviour. |
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0003-3472 |
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no |
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Equine Behaviour @ team @ |
Serial |
5255 |
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| Author |
Johnstone, R.A.; Dugatkin, L.A. |
| Title |
Coalition formation in animals and the nature of winner and loser effects |
Type |
Journal Article |
| Year |
2000 |
Publication |
Proceedings of the Royal Society B: Biological Sciences |
Abbreviated Journal |
Proc. Roy. Soc. Lond. B Biol. Sci. |
| Volume |
267 |
Issue |
1438 |
Pages |
17-21 |
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Coalition formation has been documented in a diverse array of taxa, yet there has been little formal analysis of polyadic interactions such as coalitions. Here, we develop an optimality model which examines the role of winner and loser effects in shaping coalition formation. We demonstrate that the predicted patterns of alliances are strongly dependent on the way in which winner and loser effects change with contestant strength. When winner and loser effects decrease with the resource-holding power (RHP) of the combatants, coalitions will be favoured between the strongest members of a group, but not between the weakest. If, in contrast, winner and loser effects increase with RHP, exactly the opposite predictions emerge. All other things being equal, intervention is more likely to prove worthwhile when the beneficiary of the aid is weaker (and its opponent is stronger), because the beneficiary is then less likely to win without help. Consequently, intervention is more probable when the impact of victory on the subsequent performance of a combatant increases with that individual's strength because this selects for intervention in favour of weaker combatants. The published literature on hierarchy formation does not reveal how winner and loser effects actually change with contestant strength and we therefore hope that our model will spur others to collect such data; in this light we suggest an experiment which will help to elucidate the nature of winner and loser effects and their impact on coalition formation in animals. |
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* aggression * dominance * hierarchy * intervention * reciprocity |
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10.1098/rspb.2000.0960 |
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Equine Behaviour @ team @ |
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5290 |
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Peirce, J.W.; Leigh, A.E.; Kendrick, K.M. |
| Title |
Configurational coding, familiarity and the right hemisphere advantage for face recognition in sheep |
Type |
Journal Article |
| Year |
2000 |
Publication |
Neuropsychologia |
Abbreviated Journal |
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| Volume |
38 |
Issue |
4 |
Pages |
475-483 |
| Keywords |
Asymmetry; Hemispheric lateralisation; Chimeric; Face processing; Expertise; Internal features |
| Abstract |
This study examined characteristics of visual recognition of familiar and unfamiliar faces in sheep using a 2-way discrimination task. Of particular interest were effects of lateralisation and the differential use of internal (configurational) vs external features of the stimuli. Animals were trained in a Y-maze to identify target faces from pairs, both of which were familiar (same flock as the subjects) or both of which were unfamiliar (different flock). Having been trained to identify the rewarded face a series of stimuli were presented to the sheep, designed to test for the use of each visual hemifield in the discriminations and the use of internal and external facial cues. The first experiment showed that there was a left visual hemifield (LVF) advantage in the identification of [`]hemifaces', and [`]mirrored hemifaces' and [`]chimeric' faces and that this effect was strongest with familiar faces. This represents the first evidence for visual field bias outside the primate literature. Results from the second experiment showed that, whilst both familiar and unfamiliar faces could be identified by the external features alone, only the familiar faces could be recognised by the internal features alone. Overall the results suggest separate recognition methods for socially familiar and unfamiliar faces, with the former being coded more by internal, configurational cues and showing a lateral bias to the left visual field. |
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0028-3932 |
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Equine Behaviour @ team @ |
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5343 |
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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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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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Cassinello, J.; Pieters, I. |
| Title |
Multi-male captive groups of endangered dama gazelle: Social rank, aggression, and enclosure effects |
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Journal Article |
| Year |
2000 |
Publication |
Zoo Biology |
Abbreviated Journal |
Zoo Biol. |
| Volume |
19 |
Issue |
2 |
Pages |
121-129 |
| Keywords |
stress; ungulates; zoos |
| Abstract |
A study carried out in four multi-male groups of captive dama gazelle (Gazella dama mhorr) characterized the social rank order of males and possible enclosure effects on aggression rate. A strong relationship between rank and age was found. The results also showed that dominant individuals in the two smallest enclosures were more aggressive than their herdmates, suggesting a more stressful environment, which might precipitate unstable or challenged hierarchies when the animals live in a more restricted enclosure. Subordinate males performed submissive responses at a higher frequency, irrespective of the size of the enclosure. The frequency of interactions between the gazelles, on the other hand, was affected by enclosure size, since high-ranking males showed higher values than low-ranking males in the two smallest enclosures. Frequencies of aggressive acts, retreats, and related interactions were similar in all the herds. Implications for the management of the species in captivity are discussed. Zoo Biol 19:121–129, 2000. © 2000 Wiley-Liss, Inc. |
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John Wiley & Sons, Inc. |
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1098-2361 |
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Equine Behaviour @ team @ |
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5476 |
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Fritz, J.; Bisenberger, A.; Kotrschal, K. |
| Title |
Stimulus enhancement in greylag geese: socially mediated learning of an operant task |
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Journal Article |
| Year |
2000 |
Publication |
Animal Behaviour |
Abbreviated Journal |
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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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Equine Behaviour @ team @ |
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5962 |
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