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| Author |
McGreevy, P. |
| Title |
Equine behavior |
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Journal Article |
| Year |
2004 |
Publication |
Journal of Equine Veterinary Science |
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24 |
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9 |
Pages |
397-398 |
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1983 |
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| Author |
Verguts, T.; Fias, W. |
| Title |
Representation of Number in Animals and Humans: A Neural Model |
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Journal Article |
| Year |
2004 |
Publication |
J. Cogn. Neurosci. |
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| Volume |
16 |
Issue |
9 |
Pages |
1493-1504 |
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| Abstract |
This article addresses the representation of numerical information conveyed by nonsymbolic and symbolic stimuli. In a first simulation study, we show how number-selective neurons develop when an initially uncommitted neural network is given nonsymbolic stimuli as input (e.g., collections of dots) under unsupervised learning. The resultant network is able to account for the distance and size effects, two ubiquitous effects in numerical cognition. Furthermore, the properties of the network units conform in detail to the characteristics of recently discovered number-selective neurons. In a second study, we simulate symbol learning by presenting symbolic and nonsymbolic input simultaneously. The same number-selective neurons learn to represent the numerical meaning of symbols. In doing so, they show properties reminiscent of the originally available number-selective neurons, but at the same time, the representational efficiency of the neurons is increased when presented with symbolic input. This finding presents a concrete proposal on the linkage between higher order numerical cognition and more primitive numerical abilities and generates specific predictions on the neural substrate of number processing. N1 - |
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Equine Behaviour @ team @ |
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2954 |
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Chappell J; Kacelnik A |
| Title |
Selection of tool diameter by New Caledonian crows |
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Journal Article |
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2004 |
Publication |
Anim. Cogn. |
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7 |
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121 |
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Equine Behaviour @ team @ |
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3060 |
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| Author |
Cheng, K. |
| Title |
K.J. Jeffery (ed) The neurobiology of spatial behaviour |
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Journal Article |
| Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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7 |
Issue |
3 |
Pages |
199-200 |
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Equine Behaviour @ team @ |
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3291 |
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Mendl, M.; Paul, E.S. |
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Consciousness, emotion and animal welfare: insights from cognitive science |
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2004 |
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Animal Welfare |
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13 |
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17-25 |
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refbase @ user @ |
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3512 |
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| Author |
Josep Call; Brian Hare; Malinda Carpenter; Michael Tomasello |
| Title |
`Unwilling' versus `unable': chimpanzees' understanding of human intentional action |
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Journal Article |
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2004 |
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Developmental Science |
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7 |
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488-498 |
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3517 |
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| Author |
Yacoub Khallad |
| Title |
Conceptualization in the pigeon: What do we know? |
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Journal Article |
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2004 |
Publication |
International Journal of Psychology |
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39 |
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73-94 |
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no |
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refbase @ user @ |
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3519 |
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| Author |
Passani M. B.; Blandina P. |
| Title |
The Neuronal Histaminergic System in Cognition |
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Journal Article |
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2004 |
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Current Medicinal Chemistry – Central Nervous System Agents |
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4 |
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17-26 |
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3520 |
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| Author |
Hunt, G.R.; Gray, R.D. |
| Title |
The crafting of hook tools by wild New Caledonian crows |
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Journal Article |
| Year |
2004 |
Publication |
Proceedings of the Royal Society B: Biological Sciences |
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Proc. Roy. Soc. Lond. B Biol. Sci. |
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271 |
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S88-S90 |
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The 'crafting' of tools involves (i) selection of appropriate raw material, (ii) preparatory trimming and (iii) fine, three-dimensional sculpting. Its evolution is technologically important because it allows the open-ended development of tools. New Caledonian crows manufacture an impressive range of stick and leaf tools. We previously reported that their toolkit included hooked implements made from leafy twigs, although their manufacture had never been closely observed. We describe the manufacture of 10 hooked-twig tools by an adult crow and its dependent juvenile. To make all 10 tools, the crows carried out a relatively invariant three-step sequence of complex manipulations that involved (i) the selection of raw material, (ii) trimming and (iii) a lengthy sculpting of the hook. Hooked-twig manufacture contrasts with the lack of sculpting in the making of wooden tools by other non-humans such as chimpanzees and woodpecker finches. This fine, three-stage crafting process removes another alleged difference between humans and other animals. |
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refbase @ user @ |
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3526 |
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| Author |
Koenen, E.P.C.; Aldridge, L.I.; Philipsson, J. |
| Title |
An overview of breeding objectives for warmblood sport horses |
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Journal Article |
| Year |
2004 |
Publication |
Livestock Production Science |
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88 |
Issue |
1-2 |
Pages |
77-84 |
| Keywords |
Breeding objective; Sport horse; Sport performance; Conformation; Specialisation |
| Abstract |
The aim of this paper is to review the current breeding objectives of organisations that run a selection programme for warmblood riding horses in the light of an increasing trend in trade of semen across countries. In a questionnaire, 19 horse breeding organisations provided information on breeding objective traits. Variation both in length and amount of details used to define individual breeding objectives was large, reflecting that many traits in sport horse breeding are not easy to measure, and therefore, have to be defined in a subjective way. The majority of the breeding objectives included conformation, gaits and performance in show jumping and dressage. Some breeding objectives also included behaviour, soundness, health and fertility. However, several organisations did not specify the sport discipline and the level of competition (amateur, national or international level) in the breeding objective. In general, relative weightings of the traits within the verbally presented breeding objectives were not given, but were assessed by the organisations in response to this study. The relevance of more information on expected future production circumstances and on the genetic parameters of the traits of interest are discussed. A further review of the consistency, completeness and the number of traits of the present breeding objectives for sport horses is recommended to optimise the efficiency of selection decisions. |
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refbase @ user @ |
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3954 |
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