| Records |
| Author |
Baer, K.L.; Potter, G.D.; Friend, T.H.; Beaver, B.V. |
| Title |
Observation effects on learning in horses |
Type |
Journal Article |
| Year |
1983 |
Publication |
Applied Animal Ethology |
Abbreviated Journal |
Appl. Animal. Ethol. |
| Volume |
11 |
Issue  |
2 |
Pages |
123-129 |
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| Abstract |
Sixteen horses, divided into 2 groups of 8, were used to study observational learning in horses. One group served as controls while the other group served as the treated group (observers). Observers were allowed to watch a correctly performed discrimination task for 5 days prior to testing their learning response using the same task. Discrimination testing was conducted on all horses daily for 14 days, with criterion set at 7 out of 8 responses correct with the last 5 consecutively correct. The maximum number of trials performed without reaching criterion was limited to 20 per day. Mean trials to criteria (MT) by group were: control, 11.25; observer, 10.70. Mean error (ME) scores were: control, 2.37; observer, 2.02. Average initial discrimination error scores were 11.13 for control and 10.38 for observers (P < 0.10). Asymptote was reached by Day 8 for both control and observer groups. Analysis of variance with repeated measures showed an extreme-day effect indicative of learning (P < 0.01), with non-significant differences in learning rate between experimental groups. Whether the initial ability of the horses to perform a discrimination learning task was enhanced by observation of other horses' performance of that task was not obvious from these data. |
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no |
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refbase @ user @ |
Serial |
726 |
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| Author |
Wolfe, J.M. |
| Title |
Hidden visual processes |
Type |
Journal Article |
| Year |
1983 |
Publication |
Scientific American |
Abbreviated Journal |
Sci Am |
| Volume |
248 |
Issue |
2 |
Pages |
94-103 |
| Keywords |
Color Perception/*physiology; Humans; Motion Perception/physiology; Ocular Physiology; Vision; Visual Perception/*physiology |
| Abstract |
Isoluminant stimulus is an image whose edges are defined only by a change in color, not by change in brightness. The stimulus here is imperfect: the blue parts and the green parts of the image are only as nearly equal in brightness as they can be on the printed page. Moreover, the change in brightness beyond the edge of the page is apparent, and so is the fact that the reader is holding the magazine at reading distance. When such cues are removed under laboratory conditions, subjects faced with an isoluminant stimulus prove unable to bring its edges into focus. This deficiency contributes to making a familiar face hard to recognize. The experiment indicates that the brain process underlying visual accommodation (the focusing of the eyes) cannot “see” color; it is a hidden process distinct from the processes that lead to perception. The image shows Groucho Marx as he appeared in the motion picture Horse Feathers. |
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English |
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0036-8733 |
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| Notes |
PMID:6836258 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
4066 |
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| Author |
Appleby, M.C. |
| Title |
The probability of linearity in hierarchies |
Type |
Journal Article |
| Year |
1983 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
31 |
Issue |
2 |
Pages |
600-608 |
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| Abstract |
The common practice of ranking a group of animals in the closest possible order to a linear dominance hierarchy assumes that dominance among those animals is generally transitive. In fact, analysis of groups in which dominance relationships are random shows that this method has a surprisingly high probability of producing an apparently linear or near-linear hierarchy by chance. As such, the existence of transitive dominance should be tested before it is used in ranking. A suitable statistical test is described here. Chance may also contribute to the linear appearance of hierarchies based on other factors. |
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no |
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Equine Behaviour @ team @ |
Serial |
4286 |
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| Author |
Heffner, R.S.; Heffner, H.E. |
| Title |
Hearing in large mammals: Horses (Equus caballus) and cattle (Bos taurus) |
Type |
Journal Article |
| Year |
1983 |
Publication |
Behavioral Neuroscience |
Abbreviated Journal |
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| Volume |
97 |
Issue |
2 |
Pages |
299-309 |
| Keywords |
auditory range & sensitivity, horses vs cattle |
| Abstract |
Determined behavioral audiograms for 3 horses and 2 cows. Horses' hearing ranged from 55 Hz to 33.3 kHz, with a region of best sensitivity from 1 to 16 kHz. Cattle hearing ranged from 23 Hz to 35 kHz, with a well-defined point of best sensitivity at 8 kHz. Of the 2 species, cattle proved to have more acute hearing, with a lowest threshold of –21 db (re 20 μN/m–2) compared with the horses' lowest threshold of 7 db. Comparative analysis of the hearing abilities of these 2 species with those of other mammals provides further support for the relation between interaural distance and high-frequency hearing and between high- and low-frequency hearing. (39 ref) (PsycINFO Database Record (c) 2012 APA, all rights reserved) |
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American Psychological Association |
Place of Publication |
Us |
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1939-0084(Electronic);0735-7044(Print) |
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no |
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Equine Behaviour @ team @ 1983-29540-001 |
Serial |
5633 |
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| Author |
Hogan, D.E.; Zentall, T.R.; Pace, G. |
| Title |
Control of pigeons' matching-to-sample performance by differential sample response requirements |
Type |
Journal Article |
| Year |
1983 |
Publication |
The American journal of psychology |
Abbreviated Journal |
Am J Psychol |
| Volume |
96 |
Issue |
1 |
Pages |
37-49 |
| Keywords |
Animals; Association; *Color Perception; Columbidae; Cues; *Discrimination Learning; Reinforcement Schedule; Time Factors |
| Abstract |
Pigeons were trained on a matching-to-sample task in which sample hue and required sample-specific observing behavior provided redundant, relevant cues for correct choices. On trials that involved red and yellow hues as comparison stimuli, a fixed-ratio 16 schedule (FR 16) was required to illuminate the comparisons when the sample was red, and a differential-reinforcement-of-low-rates 3-sec schedule (DRL 3-sec) was required when the sample was yellow. On trials involving blue and green hues as comparison stimuli, an FR 16 schedule was required when the sample was blue and a DRL 3-sec schedule was required when the sample was green. For some pigeons, a 0-sec delay intervened between sample offset and comparison onset, whereas other pigeons experienced a random mixture of 0-sec and 2-sec delay trials. Test trial performance at 0-sec delay indicated that sample-specific behavior controlled choice performance considerably more than sample hue did. Test performance was independent of whether original training involved all 0-sec delay trials or a mixture of 0-sec and 2-sec delays. Sample-specific observing response requirements appear to facilitate pigeons' matching-to-sample performance by strengthening associations between the observing response and correct choice. |
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English |
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0002-9556 |
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| Notes |
PMID:6859346 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
265 |
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| Author |
Boyd, R.; Silk, J.B. |
| Title |
A method for assigning cardinal dominance ranks |
Type |
Journal Article |
| Year |
1983 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
31 |
Issue |
1 |
Pages |
45-58 |
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| Abstract |
Dominance hierarchies are widely described in nature. Commonly, an individual's ordinal rank is used as a measure of its position in the hierarchy, and, therefore its priority of access to resources. This use of ordinal ranks has several related drawbacks: (1) it is difficult to assess the magnitude or the significance of the difference in degree of dominance between two individuals; (2) it is difficult to evaluate the significance of differences between dominance matrices based on different behaviours or on the same behaviour at different times, and (3) it is difficult to use parametric statistical techniques to relate dominance rank to other quantities of interest. In this paper we describe a method for assigning cardinal dominance indices that does not suffer from these drawbacks. This technique is based on the Bradley-Terry model from the method of paired comparisons. We show how this model can be reinterpreted in terms of dominance interactions. and we describe a simple iterative technique for computing cardinal ranks. We then describe how to evaluate (1) whether the rank differences between individuals are significant, and (2) whether differences in the cardinal hierarchies based on different behaviours or the same behaviour at different times are significant. We then show how to generalize the method to deal with behaviours that sometimes have ambiguous outcomes, or behaviours for which the rank difference between a pair of individuals affects the rate of interaction between them. |
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no |
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refbase @ user @ |
Serial |
859 |
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| Author |
Ristau, C.A. |
| Title |
Language, cognition, and awareness in animals? |
Type |
Journal Article |
| Year |
1983 |
Publication |
Ann. N.Y. Acad. Sci. |
Abbreviated Journal |
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| Volume |
406 |
Issue |
1 |
Pages |
170-186 |
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no |
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Equine Behaviour @ team @ |
Serial |
2952 |
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| Author |
Premack, D. |
| Title |
Animal Cognition |
Type |
Journal Article |
| Year |
1983 |
Publication |
Annual Review of Psychology |
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34 |
Issue |
1 |
Pages |
351-362 |
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no |
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refbase @ user @ |
Serial |
3535 |
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| Author |
Langlois, B.; Minkema, D.; Bruns, E. |
| Title |
Genetic problems in horse breeding |
Type |
Journal Article |
| Year |
1983 |
Publication |
Livestock Production Science |
Abbreviated Journal |
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| Volume |
10 |
Issue |
1 |
Pages |
69-81 |
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| Abstract |
The purpose of this paper is to give a short survey of the present problems concerning the genetic improvement of horse breeds. The evolution of these populations in Europe, characterized by a deep change from production of draught horses towards that of leisure horses, is described and the influence of the demographical parameters on the selection of these horse populations, is discussed. The generation interval represents an important handicap only surmounted in the case of racing breeds where a high selection intensity can be practised since all animals are subjected to performance testing. In the other cases, the farmer usually does not use modern breeding techniques, but uses crosses instead, which lead more easily to visible results. The available selection criteria are also dealt with. A distinction is made between direct estimates evaluating the abilities of the animals in practice and the indirect estimates measuring a character in correlation to previous ones. For the former estimates, a distinction is made between those resulting from competitions (handicap, records or earnings) and those resulting from direct in-station measurements (saddle, jumping, dressage abilities, draught power). For the indirect estimates, often used especially for the selection of mares, the most important analysis is obviously that of the conformation. However, in the future early selection criteria according to more physiological data should be sought and developed. Estimation of the breeding value according to a given ability is thereafter pointed out. There are two situations: “the panmictic case” concerning sport and draught horses and “the non-panmictic case” corresponding to racing horses, which give rise to some problems. The setting up of breeding plans is discussed. Due to the different economic situations and various objectives of horse production, conclusions are drawn about the role played by geneticists in the present development of this sector. |
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no |
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refbase @ user @ |
Serial |
3967 |
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| Author |
Sone, K. |
| Title |
[Apropos of 5 cases of so-called “delusions of cutaneous and intestinal infestation”--psychopathologic and neuropsychological considerations] |
Type |
Journal Article |
| Year |
1983 |
Publication |
Folia Psychiatrica et Neurologica Japonica |
Abbreviated Journal |
Folia Psychiatr Neurol Jpn |
| Volume |
37 |
Issue |
1 |
Pages |
37-55 |
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Adult; Aged; Agnosia/complications; Attitude to Health; Delusions/complications/etiology/*psychology; Female; Humans; Intestines; Male; Middle Aged; Personality; Psychotherapy; *Sensation; Skin |
| Abstract |
Five cases with so-called “Dermato- und Enterozoenwahn” are reported, and the following themes are analysed from the “multidimensional” point of view: 1) process to build the shape of the intruder which is bothering the patients, 2) behavior against the intruding small animal and attitude towards the therapeutist; their characteristic manner to make complaints, 3) premorbid personality and 4) physical findings. In regard to one of the formation types of this disease, we have postulated through the neuropsychological analysis of case 5 (somatoparaphrenic patient) that patients of the typical cases 1, 2 and 3 suffer from a special kind of agnosia (perturbation of recognition; disturbance of aperception) in which they take their abnormal body sensations for causing by the small imaginary animals. Our cases showed the importance of a premorbid personality and present life-situations in combination with physical dissolution taking part in the pathoplastic process of this particular disease. |
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German |
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Uber funf Falle von sogenanntem “Dermato- und Enterozoenwahn”--psychopathologische und neuropsychologische Betrachtungen |
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| ISSN |
0015-5721 |
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| Notes |
PMID:6884912 |
Approved |
no |
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Equine Behaviour @ team @ |
Serial |
4187 |
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