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Author |
Boyd, R.; Richerson, P.J. |
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Title |
Punishment allows the evolution of cooperation (or anything else) in sizable groups |
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Year |
1992 |
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Ethol. Sociobiol. |
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13 |
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171-195 |
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Existing models suggest that reciprocity is unlikely to evolve in large groups as a result of natural selection. In these models, reciprocators punish noncooperation by with-holding future cooperation, and thus also penalize other cooperators in the group. Here, we analyze a model in which the response is some form of punishment that is directed solely at noncooperators. We refer to such alternative forms of punishment as retribution. We show that cooperation enforced by retribution can lead to the evolution of cooperation in two qualitatively different ways. (1) If benefits of cooperation to an individual are greater than the costs to a single individual of coercing the other n − 1 individuals to cooperate, then strategies which cooperate and punish noncooperators, strategies which cooperate only if punished, and, sometimes, strategies which cooperate but do not punish will coexist in the long run. (2) If the costs of being punished are large enough, moralistic strategies which cooperate, punish noncooperators, and punish those who do not punish noncooperators can be evolutionarily stable. We also show, however, that moralistic strategies can cause any individually costly behavior to be evolutionarily stable, whether or not it creates a group benefit. |
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10.1016/0162-3095(92)90032-Y |
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Call Number |
Equine Behaviour @ team @ |
Serial |
4913 |
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Author |
Elzenga, J. W, |
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Title |
Why zebras are striped |
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Year |
1992 |
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Swara |
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Swara |
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Volume |
15 |
Issue |
4 |
Pages |
28-30 |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1068 |
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Author |
Cheney DL; Seyfarth RM |
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Title |
Characterizing the mind of another species |
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Year |
1992 |
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Behav. Brain Sci. |
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15 |
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172 |
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Equine Behaviour @ team @ |
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2988 |
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Author |
Urcuioli, P.J.; Zentall, T.R. |
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Title |
Transfer across delayed discriminations: evidence regarding the nature of prospective working memory |
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Journal Article |
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Year |
1992 |
Publication |
Journal of experimental psychology. Animal behavior processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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Volume |
18 |
Issue |
2 |
Pages |
154-173 |
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Keywords |
Animals; *Appetitive Behavior; Attention; *Color Perception; Columbidae; *Discrimination Learning; *Mental Recall; *Pattern Recognition, Visual; Problem Solving; Retention (Psychology); *Transfer (Psychology) |
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Pigeons were trained successively either on 2 delayed simple discriminations or on a delayed simple discrimination followed by delayed matching-to-sample. During subsequent transfer tests, the initial stimuli from the 1st task were substituted for those in the 2nd. Performances transferred immediately if both sets of initial stimuli had been associated with the presence versus absence of food on their respective retention tests, and the direction of transfer (positive or negative) depended on whether the substitution involved stimuli with identical or different outcome associates. No transfer was found, however, when the initial stimuli were associated with different patterns of responding but food occurred at the end of every trial. These results are consistent with outcome expectancy mediation but are incompatible with response intention and retrospective coding accounts. |
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Department of Psychological Sciences, Purdue University, West Lafayette, Indiana 47907-1364 |
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0097-7403 |
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PMID:1583445 |
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no |
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Call Number |
refbase @ user @ |
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260 |
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Author |
Reid, P.J.; Shettleworth, S.J. |
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Title |
Detection of cryptic prey: search image or search rate? |
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Journal Article |
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Year |
1992 |
Publication |
Journal of experimental psychology. Animal behavior processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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Volume |
18 |
Issue |
3 |
Pages |
273-286 |
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Keywords |
Animals; Appetitive Behavior; *Attention; Color Perception; Columbidae; *Discrimination Learning; Food Preferences/psychology; *Imagination; *Mental Recall; *Predatory Behavior |
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Animals' improvement in capturing cryptic prey with experience has long been attributed to a perceptual mechanism, the specific search image. Detection could also be improved by adjusting rate of search. In a series of studies using both naturalistic and operant search tasks, pigeons searched for wheat, dyed to produce 1 conspicuous and 2 equally cryptic prey types. Contrary to the predictions of the search-rate hypothesis, pigeons given a choice between the 2 cryptic types took the type experienced most recently. However, experience with 1 cryptic type improved accuracy on the other cryptic type, a result inconsistent with a search image specific to 1 prey type. Search image may better be thought of as priming of attention to those features of the prey type that best distinguish the prey from the background. |
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University of Toronto, Ontario, Canada |
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0097-7403 |
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Notes |
PMID:1619395 |
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Call Number |
refbase @ user @ |
Serial |
381 |
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Author |
Shettleworth, S.J.; Plowright, C.M. |
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Title |
How pigeons estimate rates of prey encounter |
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Journal Article |
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Year |
1992 |
Publication |
Journal of experimental psychology. Animal behavior processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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Volume |
18 |
Issue |
3 |
Pages |
219-235 |
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Keywords |
Analysis of Variance; Animals; *Appetitive Behavior; Columbidae; Conditioning, Operant; Food Preferences/*psychology; Motivation; *Predatory Behavior; *Probability Learning; *Reinforcement Schedule; Social Environment |
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Abstract |
Pigeons were trained on operant schedules simulating successive encounters with prey items. When items were encountered on variable-interval schedules, birds were more likely to accept a poor item (long delay to food) the longer they had just searched, as if they were averaging prey density over a short memory window (Experiment 1). Responding as if the immediate future would be like the immediate past was reversed when a short search predicted a long search next time (Experiment 2). Experience with different degrees of environmental predictability appeared to change the length of the memory window (Experiment 3). The results may reflect linear waiting (Higa, Wynne, & Staddon, 1991), but they differ in some respects. The findings have implications for possible mechanisms of adjusting behavior to current reinforcement conditions. |
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Department of Psychology, University of Toronto, Ontario, Canada |
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0097-7403 |
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Notes |
PMID:1619391 |
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no |
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Call Number |
refbase @ user @ |
Serial |
382 |
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Author |
Whiten, A.; Ham, R. |
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Title |
On the nature and evolution of imitation in the animal kingdom: reappraisal of a century of research. |
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Journal Article |
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Year |
1992 |
Publication |
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Abbreviated Journal |
Adv. Study Behav. |
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Volume |
21 |
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Pages |
239-283 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
5599 |
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Author |
Poysa, Hannu |
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Title |
Group Foraging in Patchy Environments: The Importance of Coarse-Level Local Enhancement |
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Journal Article |
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Year |
1992 |
Publication |
Ornis Scandinavica |
Abbreviated Journal |
Ornis[ Scand[ |
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Volume |
23 |
Issue |
2 |
Pages |
159-166 |
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Abstract |
Local enhancement is one way individuals may realize foraging advantages from grouping. A distinction between fine-level and coarse-level local enhancement is made, the latter often being neglected in theoretical research on group foraging. In the former case, an individual has a higher feeding rate as a member of a group because individuals copy other group members' foraging, whereas in the latter, groups simply attract other individuals to patches where food is particularly abundant and copying does not occur within the group. Coarse-level local enhancement may decrease the time needed to find profitable feeding patches in spatially and temporally variable environments. A review of the empirical literature indicated that coarse-level local enhancement is typical in bird species foraging in open habitats and in large groups with relatively little competition between group members whereas the opposite attributes fit the species for which fine-level local enhancement had been documented. Furthermore, species in which coarse-level local enhancement prevails usually forage in temporary groups. However, coarse-level and fine-level local enhancement are not necessarily mutually exclusive, but which one is more important in a particular case may be habitat-dependent. |
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Equine Behaviour @ team @ |
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4272 |
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Author |
Kraus-Hansen, A.E.; Fackelman, G.E.; Becker, C.; Williams, R.M.; Pipers, F.S. |
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Title |
Preliminary studies on the vascular anatomy of the equine superficial digital flexor tendon |
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Journal Article |
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Year |
1992 |
Publication |
Equine veterinary journal |
Abbreviated Journal |
Equine Vet J |
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Volume |
24 |
Issue |
1 |
Pages |
46-51 |
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Keywords |
Angiography/veterinary; Animals; Exercise Test/veterinary; Forelimb; Horses/*anatomy & histology/surgery; Microcirculation; Microscopy, Electron, Scanning; Tendons/*blood supply/surgery/ultrastructure |
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The vascular and microvascular anatomy of normal equine superficial digital flexor tendons was studied by dissection of vinyl-perfused specimens and by microangiography on high detail film. The presence of an extensive intratendinous vascular latticework was confirmed, and a 'nutrient artery' described closely associated with the accessory ligament of the superficial digital flexor tendon (proximal check ligament). Circumferential stripping of the paratenon from the tendon to eliminate afferent vessels was performed bilaterally in three horses and unilaterally in a fourth, followed by a treadmill training regimen. No resulting intratendinous lesions could be documented on gross post mortem and histological examination at three, 10, or 35 days post operatively. There was mild paratendinous proliferation in all instances. In one horse, four intratendinous ligatures were placed within the medial and lateral borders of the contralateral tendon to isolate further from its blood supply a 10 cm segment. Gross lesions at 35 days post operatively included a marked paratendinous response involving the entire 10 cm segment, and a darkened, soft focus within the core of the tendon. Histopathology and electron microscopy demonstrated focal degeneration. It was concluded that the blood supply of the normal equine superficial digital flexor tendon is primarily intratendinous, rather than paratendinous as previously thought. The lesions in one horse similar to those in naturally occurring tendinitis supported a vascular aetiology of the disease, and set the groundwork for studies aimed at the development of a clinically relevant tendinitis model. |
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Department of Surgery, Tufts University School of Veterinary Medicine, North Grafton, Massachusetts 01536 |
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0425-1644 |
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PMID:1555540 |
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refbase @ user @ |
Serial |
151 |
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Author |
Dvoinos, G.M.; Kharchenko, V.A.; Zviagnitsova, N.S. |
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Title |
The characteristics of the helminth community in the Turkmen kulan (Equus hemionus) |
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Journal Article |
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Year |
1992 |
Publication |
Parazitologiia |
Abbreviated Journal |
Parazitologiia |
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Volume |
26 |
Issue |
3 |
Pages |
246-251 |
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Keywords |
Animals; Female; Helminthiasis/parasitology; Helminthiasis, Animal; Helminths/classification/*isolation & purification; Male; Perissodactyla/*parasitology; Turkmenistan; Ukraine |
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The helminth fauna of 24 kulans from Askaniya-Nova and Badkhyz was studied. 42 species of helminths were found, 34 of which belong to strongylids. The helminth species composition of kulan is similar to that of other species of horses. This is a result of an intensive parasite exchange in the historical past when numerous populations of different Equidae species made long seasonal migrations over steppe inter-river lands of Asia and grazed for some time on common pastures. |
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Russian |
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K kharakteristike soobshchestva gel'mintov turkmenskogo kulana (Equus hemionus) |
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0031-1847 |
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PMID:1408368 |
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Equine Behaviour @ team @ |
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2285 |
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