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Reeve, H.K. |
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Queen activation of lazy workers in colonies of the eusocial naked mole-rat |
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1992 |
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Nature |
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Nature |
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358 |
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147-149 |
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10.1038/358147a0 |
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Equine Behaviour @ team @ |
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4921 |
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Chapron, G.; Kaczensky, P.; Linnell, J.D.C.; Arx, M.; Huber, D.; Andrén, H. |
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Recovery of large carnivores in Europe's modern human-dominated landscapes |
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2014 |
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Science |
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346 |
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Equine Behaviour @ team @ Chapron2014 |
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6451 |
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Gesquiere, L.R.; Learn, N.H.; Simao, M.C.M.; Onyango, P.O.; Alberts, S.C.; Altmann, J. |
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Title |
Life at the Top: Rank and Stress in Wild Male Baboons |
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Journal Article |
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2011 |
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Science |
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333 |
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6040 |
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357-360 |
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In social hierarchies, dominant individuals experience reproductive and health benefits, but the costs of social dominance remain a topic of debate. Prevailing hypotheses predict that higher-ranking males experience higher testosterone and glucocorticoid (stress hormone) levels than lower-ranking males when hierarchies are unstable but not otherwise. In this long-term study of rank-related stress in a natural population of savannah baboons (Papio cynocephalus), high-ranking males had higher testosterone and lower glucocorticoid levels than other males, regardless of hierarchy stability. The singular exception was for the highest-ranking (alpha) males, who exhibited both high testosterone and high glucocorticoid levels. In particular, alpha males exhibited much higher stress hormone levels than second-ranking (beta) males, suggesting that being at the very top may be more costly than previously thought. |
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10.1126/science.1207120 |
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Equine Behaviour @ team @ |
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5655 |
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Hoang, L.; Maity, H.; Krishna, M.M.G.; Lin, Y.; Englander, S.W. |
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Title |
Folding units govern the cytochrome c alkaline transition |
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Journal Article |
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2003 |
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Journal of Molecular Biology |
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J Mol Biol |
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331 |
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1 |
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37-43 |
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Animals; Cytochrome c Group/*chemistry; Horses; Hydrogen/chemistry; Hydrogen-Ion Concentration; Kinetics; Models, Molecular; *Protein Folding; Protein Structure, Tertiary; Spectrum Analysis; Titrimetry |
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The alkaline transition of cytochrome c is a model for protein structural switching in which the normal heme ligand is replaced by another group. Stopped flow data following a jump to high pH detect two slow kinetic phases, suggesting two rate-limiting structure changes. Results described here indicate that these events are controlled by the same structural unfolding reactions that account for the first two steps in the reversible unfolding pathway of cytochrome c. These and other results show that the cooperative folding-unfolding behavior of protein foldons can account for a variety of functional activities in addition to determining folding pathways. |
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Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6059, USA. lhoang@mail.upenn.edu |
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0022-2836 |
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PMID:12875834 |
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Equine Behaviour @ team @ |
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3781 |
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Author |
Terrace, H.S. |
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Title |
Chunking by a pigeon in a serial learning task |
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1987 |
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Nature |
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Nature |
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325 |
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7000 |
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149-151 |
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Animals; Cognition/*physiology; Columbidae/*physiology; Feedback; Learning/*physiology; Male |
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A basic principle of human memory is that lists that can be organized into memorable 'chunks' are easier to remember. Memory span is limited to a roughly constant number of chunks and is to a large extent independent of the amount of informaton contained in each chunk. Depending on the ingenuity of the code used to integrate discrete items into chunks, one can substantially increase the number of items that can be recalled correctly. Newly developed paradigms for studying memory in non-verbal organisms allow comparison of the abilities of human and non-human subjects to memorize lists. Here I present two types of evidence that pigeons 'chunk' 5-element lists whose components (colours and achromatic geometric forms) are clustered into distinct groups. Those lists were learned twice as rapidly as a homogeneous list of colours or heterogeneous lists in which the elements are not clustered. The pigeons were also tested for knowledge of the order of two elements drawn from the 5-element lists. They responded in the correct order only to those subsets that contained a chunk boundary. Thus chunking can be studied profitably in animal subjects; the cognitive processes that allow an organism to form chunks do no presuppose linguistic competence. |
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0028-0836 |
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PMID:3808071 |
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no |
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Equine Behaviour @ team @ |
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2792 |
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Author |
George, I.; Cousillas, H.; Richard, J.-P.; Hausberger, M. |
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Title |
Song perception in the European starling: hemispheric specialisation and individual variations |
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Journal Article |
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Year |
2002 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
Compt. Rend. Biol. |
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325 |
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3 |
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197-204 |
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lateralisation; perception; birdsong; starling; electrophysiology; individual variations; latéralisation; perception; chant; étourneaux; électrophysiologie; variations individuelles |
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Hemispheric specialisation for speech in humans has been well documented. The lateralisation for song production observed in songbirds is reminiscent of this hemispheric dominance. In order to investigate whether song perception is also lateralised, we made multiunit recordings of the neuronal activity in the field L of starlings during the presentation of species-specific and artificial non-specific sounds. We observed a systematic stronger activation in one hemisphere than in the other one during the playback of species-specific sounds, with inter-subject variability in the predominant hemisphere for song perception. Such an asymmetry was not observed for artificial non-specific sounds. Thus, our results suggest that, at least at the individual level, the two hemispheres of the starlings' brain perceive and process conspecific signals differently. |
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no |
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Equine Behaviour @ team @ |
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4636 |
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Author |
Schmidt, M.; Lipson, H. |
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Title |
Distilling Free-Form Natural Laws from Experimental Data |
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Journal Article |
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Year |
2009 |
Publication |
Science |
Abbreviated Journal |
Science |
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324 |
Issue |
5923 |
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81-85 |
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For centuries, scientists have attempted to identify and document analytical laws that underlie physical phenomena in nature. Despite the prevalence of computing power, the process of finding natural laws and their corresponding equations has resisted automation. A key challenge to finding analytic relations automatically is defining algorithmically what makes a correlation in observed data important and insightful. We propose a principle for the identification of nontriviality. We demonstrated this approach by automatically searching motion-tracking data captured from various physical systems, ranging from simple harmonic oscillators to chaotic double-pendula. Without any prior knowledge about physics, kinematics, or geometry, the algorithm discovered Hamiltonians, Lagrangians, and other laws of geometric and momentum conservation. The discovery rate accelerated as laws found for simpler systems were used to bootstrap explanations for more complex systems, gradually uncovering the “alphabet” used to describe those systems. |
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10.1126/science.1165893 |
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no |
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Equine Behaviour @ team @ |
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5264 |
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Author |
Terrace, H.S. |
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Title |
Animal Cognition: Thinking without Language |
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1985 |
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Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences (1934-1990) |
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308 |
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1135 |
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113-128 |
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Recent attempts to teach apes rudimentary grammatical skills have produced negative results. The basic obstacle appears to be at the level of the individual symbol which, for apes, functions only as a demand. Evidence is lacking that apes can use symbols as names, that is, as a means of simply transmitting information. Even though non-human animals lack linguistic competence, much evidence has recently accumulated that a variety of animals can represent particular features of their environment. What then is the non-verbal nature of animal representations? This question will be discussed with reference to the following findings of studies of serial learning by pigeons. While learning to produce a particular sequence of four elements (colours), pigeons also acquire knowledge about the relation between non-adjacent elements and about the ordinal position of a particular element. Learning to produce a particular sequence also facilitates the discrimination of that sequence from other sequences. |
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refbase @ user @ |
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3522 |
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Author |
Kummer, H.; Goodall, J. |
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Conditions of Innovative Behaviour in Primates |
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Journal Article |
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1985 |
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Philosophical Transactions of the Royal Society of London. B, Biological Sciences |
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308 |
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1135 |
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203-214 |
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Innovative behaviour achieved through exploration, learning and insight heavily depends on certain motivational, social and ecological conditions of short duration. We propose that more attention should be given to what these conditions are and where they are realized in natural groups of non-human primates. Only to the extent that such favourable conditions were frequently realized in a social structure or an extraspecific environment could selective pressures act on innovative abilities. There is hope that research into field conditions of innovative behaviour will help to identify its selectors in evolution. |
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10.1098/rstb.1985.0020 |
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Equine Behaviour @ team @ |
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5751 |
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Author |
Danchin, E.; Giraldeau, L.-A.; Valone, T.J.; Wagner, R.H. |
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Public information: from nosy neighbors to cultural evolution |
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Journal Article |
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2004 |
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Science (New York, N.Y.) |
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Science |
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305 |
Issue |
5683 |
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487-491 |
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Animals; *Behavior, Animal; Cues; *Cultural Evolution; *Decision Making; Environment; Evolution; Feeding Behavior; Female; Genes; Humans; Male; Reproduction; Sexual Behavior, Animal |
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Psychologists, economists, and advertising moguls have long known that human decision-making is strongly influenced by the behavior of others. A rapidly accumulating body of evidence suggests that the same is true in animals. Individuals can use information arising from cues inadvertently produced by the behavior of other individuals with similar requirements. Many of these cues provide public information about the quality of alternatives. The use of public information is taxonomically widespread and can enhance fitness. Public information can lead to cultural evolution, which we suggest may then affect biological evolution. |
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U.P.M.C. CNRS-UMR7625, Bat A-7e etage-Case 237, 7 quai Saint Bernard, 75252 Paris Cedex 05, France. edanchin@snv.jussieu.fr |
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1095-9203 |
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PMID:15273386 |
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2131 |
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