| Records |
| Author |
Levin, L.E. |
| Title |
Passage order through different pathways in groups of schooling fish, and the diversified leadership hypothesis |
Type |
Journal Article |
| Year |
1996 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
37 |
Issue  |
1 |
Pages |
1-8 |
| Keywords |
Animal sociality; Inter-individual variability; Aggregation-dispersion; Group problem solving |
| Abstract |
The diversified leadership hypothesis proposes that different individuals within a school of fish act as leaders in different circumstances. This `circumstantial leadership' results from inter-individual behavioral variability and a `cohesion-dispersion' tendency modulated by `failure-success' contingencies. The hypothesis predicts that when offered different pathways to escape the restriction of their swimming space, individuals within a group of fish will show 1. (a) consistent passage orders in each pathway, but2. (b) different passage orders in different pathways. Using an avoidance paddle and three different groups of fish (Aphyocharax erithrurus) the results confirmed prediction 1. (a) while prediction2. (b) was verified only in one group. |
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Equine Behaviour @ team @ room B 3.029 |
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2069 |
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| Author |
Tebbich, S.; Taborsky, M.; Winkler, H. |
| Title |
Social manipulation causes cooperation in keas |
Type |
Journal Article |
| Year |
1996 |
Publication |
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| Volume |
52 |
Issue |
1 |
Pages |
1-10 |
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Abstract. This study assessed whether keas,Nestor notabilis, are able to cooperate in an instrumental task. Seven birds of a captive group were tested in group situations and in dyads. At least two individuals had to manipulate an apparatus to obtain food but only one participant was rewarded. One bird had to push down a lever to enable another one to collect food from a box. The distribution of the two different roles was clearly dependent on hierarchy. The higher ranking individual always obtained the reward and each bird changed its role according to dominance status. Owing to the non-linear hierarchy in the group, each bird participating in cooperative interactions had at least one submissive partner. Therefore, in group situations the reward was distributed symmetrically and cooperation was persistent. In dyadic test situations, three individual keas aggressively manipulated their respective subordinate partners to open the apparatus. Their dominance status enabled them to force cooperation. |
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Equine Behaviour @ team @ |
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2189 |
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| Author |
Boysen, S.T.; Bernston, G.G.; Hannan, M.B.; Cacioppo, J.T. |
| Title |
Quantity-based interference and symbolic representations in chimpanzees (Pan troglodytes) |
Type |
Journal Article |
| Year |
1996 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
| Volume |
22 |
Issue |
1 |
Pages |
76-86 |
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Animals; Behavior, Animal; Cognition; *Discrimination Learning; Female; Male; *Pan troglodytes; *Reinforcement (Psychology); Task Performance and Analysis |
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Five chimpanzees with training in counting and numerical skills selected between 2 arrays of different amounts of candy or 2 Arabic numerals. A reversed reinforcement contingency was in effect, in which the selected array was removed and the subject received the nonselected candies (or the number of candies represented by the nonselected Arabic numeral). Animals were unable to maximize reward by selecting the smaller array when candies were used as array elements. When Arabic numerals were substituted for the candy arrays, all animals showed an immediate shift to a more optimal response strategy of selecting the smaller numeral, thereby receiving the larger reward. Results suggest that a response disposition to the high-incentive candy stimuli introduced a powerful interference effect on performance, which was effectively overridden by the use of symbolic representations. |
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Ohio State University, Department of Psychology, Ohio State University, Columbus 43210-1222, USA |
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English |
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0097-7403 |
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PMID:8568498 |
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Equine Behaviour @ team @ |
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2781 |
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Fetterman, J.G. |
| Title |
Dimensions of stimulus complexity |
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Journal Article |
| Year |
1996 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
| Volume |
22 |
Issue |
1 |
Pages |
3-18 |
| Keywords |
Animals; *Behavior, Animal; Cognition; *Learning; Memory; Time Factors |
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Animal learning research has increasingly used complex stimuli that approximate natural objects, events, and locations, a trend that has accompanied a resurgence of interest in the role of cognitive factors in learning. Accounts of complex stimulus control have focused mainly on cognitive mechanisms and largely ignored the contribution of stimulus information to perception and memory for complex events. It is argued here that research on animal learning stands to benefit from a more detailed consideration of the stimulus and that James Gibson's stimulus-centered theory of perception serves as a useful framework for analyses of complex stimuli. Several issues in the field of animal learning and cognition are considered from the Gibsonian perspective on stimuli, including the fundamental problem of defining the effective stimulus. |
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Department of Psychology, Indiana University-Purdue University, Indianapolis 46202, USA |
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English |
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0097-7403 |
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PMID:8568494 |
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no |
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Equine Behaviour @ team @ |
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2782 |
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Palme, R.; Fischer, P.; Schildorfer, H.; Ismail, M.N. |
| Title |
Excretion of infused 14C-steroid hormones via faeces and urine in domestic livestock |
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Journal Article |
| Year |
1996 |
Publication |
Animal Reproduction Science |
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43 |
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1 |
Pages |
43-63 |
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Sheep--endocrinology; Pig--endocrinology; Pony; 14C-steroids; Faeces; Urine; Blood |
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The aim of this comparative study was to gain more information about the excretion of steroid hormones in farm animals. This should help to establish or improve non-invasive steroid monitoring procedures, especially in zoo and wildlife animals. Over a period of 4 h the 14C-steroid hormones (3.7 MBq) progesterone (three females), testosterone (three males), cortisol and oestrone (two males, two females) were infused intravenously in sheep, ponies and pigs. Faeces were collected immediately after defecation. Urine was sampled via a permanent catheter in females and after spontaneous urination in males. A total of 88 +/- 10% (mean +/- SD) of the administered radioactivity was recovered. Considerable interspecies differences were measured both in the amounts of steroid metabolites excreted via faeces or urine and the time course of excretion. Progesterone and oestrone in ewes, and progesterone in mares were excreted mainly in the faeces (over 75%). The primary route of excretion of all other 14C-steroids was via the urine but to a different extent. In general, sheep showed the highest degree of faecal excretion and pigs the least. The highest radioactivity in urine (per mmol creatinine) was observed during the infusion or in one of the next two samples thereafter, whereas in faeces it was measured about 12 h (sheep), 24 h (ponies) or 48 h (pigs) after the end of the infusion. Thereafter the radioactivity declined and reached background levels within 2-3 weeks. In faeces, steroid metabolites were present mainly in an unconjugated form, but in blood and urine as conjugates. Mean retention time of faecal radioactivity suggested that the passage rate of digesta (duodenum to rectum) played an important role in the time course of the excretion of steroids. The information derived from this investigation could improve the precision of sampling as well as the extraction of steroids from the faeces. Furthermore, the study demonstrates that it should be possible to establish methods for measuring faecal androgen and cortisol metabolites for assessing male reproductive endocrinology and stress in animals. |
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Equine Behaviour @ team @ |
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4069 |
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Miller, R.M. |
| Title |
How we can quickly assume the role of horse herd leader: Making horses compliant and willing subjects |
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Journal Article |
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1996 |
Publication |
Journal of Equine Veterinary Science |
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16 |
Issue |
1 |
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4-7 |
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Equine Behaviour @ team @ |
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4329 |
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| Author |
Gueron, S.; Levin, S.A.; Rubenstein, D.I. |
| Title |
The Dynamics of Herds: From Individuals to Aggregations |
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Journal Article |
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1996 |
Publication |
Journal of Theoretical Biology |
Abbreviated Journal |
J. Theor. Biol. |
| Volume |
182 |
Issue |
1 |
Pages |
85-98 |
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The dynamic behavior of small herds is investigated by means of simulations of two-dimensional discrete-stochastic models. An individual-based approach is used to relate collective behavior to individual decisions. In our model, the motion of an individual in a herd is assumed to be the combined result of both density-independent and density-dependent decisions, in the latter case based on the influence of surrounding neighbors; assumed decision rules are hierarchical, balancing short range repulsion against long-range attraction. The probability of fragmentation of the model herd depends on parameter values. We explore the variety and characteristics of spatial patterns that develop during migration, for herds that are homogeneous and heterogeneous regarding intrinsic walking speeds. Group integrity can be maintained even in mixed populations, but fragmentation results for these more easily than for a homogeneous herd. Observations of natural populations suggest that animals move away from individuals that intrude too closely into their environment, but are attracted to individuals at a distance. Between these extremes, there appears to be a neutral zone, within which other individuals engender no response. We explore the importance of this neutral zone, and offer evolutionary interpretations. In particular, the neutral zone, if not too large, permits the individual to remain in contact with the herd, while reducing the frequency with which acceleration or deceleration must be undertaken. This offers obvious energetic benefits. |
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0022-5193 |
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Equine Behaviour @ team @ |
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5253 |
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Salmivalli, C.; Lagerspetz, K.; Björkqvist, K.; Österman, K.; Kaukiainen, A. |
| Title |
Bullying as a group process: Participant roles and their relations to social status within the group |
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Journal Article |
| Year |
1996 |
Publication |
Aggressive Behavior |
Abbreviated Journal |
Aggr. Behav. |
| Volume |
22 |
Issue |
1 |
Pages |
1-15 |
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aggressive behavior; peer relations; roles; social acceptance; social groups; victimization |
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Bullying was investigated as a group process, a social phenomenon taking place in a school setting among 573 Finnish sixth-grade children (286 girls, 287 boys) aged 12–13 years. Different Participant Roles taken by individual children in the bullying process were examined and related to a) self-estimated behavior in bullying situations, b) social acceptance and social rejection, and c) belongingness to one of the five sociometric status groups (popular, rejected, neglected, controversial, and average). The Participant Roles assigned to the subject were Victim, Bully, Reinforcer of the bully, Assistant of the bully, Defender of the victim, and Outsider. There were significant sex differences in the distribution of Participant Roles. Boys were more frequently in the roles of Bully, Reinforcer and Assistant, while the most frequent roles of the girls were those of Defender and Outsider. The subjects were moderately well aware of their Participant Roles, although they underestimated their participation in active bullying behavior and emphasized that they acted as Defenders and Outsiders. The sociometric status of the children was found to be connected to their Participant Roles. © 1996 Wiley-Liss, Inc. |
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Wiley Subscription Services, Inc., A Wiley Company |
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1098-2337 |
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Equine Behaviour @ team @ |
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5435 |
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Kroodsma, D. E.; Miller, E. H. (eds) |
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Ecology and evolution of acoustic communication in birds |
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Book Whole |
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1996 |
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Cornell University Press |
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Ithaca |
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Kroodsma, D. E.; Miller, E. H. |
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978-0801482212 |
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Equine Behaviour @ team @ |
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2166 |
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Heyes, C.; Galef, B.G. (eds) |
| Title |
Social learning in animals: the roots of culture |
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Book Whole |
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1996 |
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Academic Press, Inc. |
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San Diego, CA |
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Heyes, C. ; Galef, B.G. |
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978-0122739651 |
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Equine Behaviour @ team @ home |
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2174 |
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