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Author Miller J,
Title National forest management of wild horses and burros: Current position and policy Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet Sc
Volume 6 Issue Pages 259-260
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1393
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Author Turner Jw, K.J.
Title Fertility control as a management tool for feral horse populations Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet Sc
Volume 6 Issue Pages 278-284
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1669
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Author Turner Jw, K.J.
Title Hormones and reproduction in feral horses Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet Sc
Volume 6 Issue Pages 250-258
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1670
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Author White Dj,
Title The american humane association: Position on wild horse management Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet Sc
Volume 6 Issue Pages 276-277
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1706
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Author Wolfe Ml,
Title Population dynamics of feral horses in western North America Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet Sc
Volume 6 Issue Pages 231-235
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1717
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Author Berg Wa,
Title Effective population size estimates and breeding in feral horses: A preliminary assessment Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet. Sc.
Volume 6 Issue Pages 240-245
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 933
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Author Boyles Js,
Title Managing America's wild horses and burros Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet. Sc.
Volume 6 Issue Pages 261
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 972
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Author Smith Ma,
Title Potential competitive interactions between feral horses and other grazing animals Type Journal Article
Year 1986 Publication Abbreviated Journal (up) J Equine Vet. Sc.
Volume 6 Issue Pages 238-239
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Notes from Professor Hans Klingels Equine Reference List Approved no
Call Number Serial 1610
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Author Biederman, G.B.; Robertson, H.A.; Vanayan, M.
Title Observational learning of two visual discriminations by pigeons: a within-subjects design Type Journal Article
Year 1986 Publication Journal of the experimental analysis of behavior Abbreviated Journal (up) J Exp Anal Behav
Volume 46 Issue 1 Pages 45-49
Keywords Animals; Attention; Columbidae; Conditioning, Operant; Cues; *Discrimination Learning; *Imitative Behavior; Male; Visual Perception
Abstract Pigeon's observational learning of successive visual discrimination was studied using within-subject comparisons of data from three experimental conditions. Two pairs of discriminative stimuli were used; each bird was exposed to two of the three experimental conditions, with different pairs of stimuli used in a given bird's two conditions. In one condition, observers were exposed to visual discriminative stimuli only. In a second condition, subjects were exposed to a randomly alternating sequence of two stimuli where the one that would subsequently be used as S+ was paired with the operation of the grain magazine. In a third experimental condition, subjects were exposed to the performance of a conspecific in the operant discrimination procedure. After exposures to conspecific performances, there was facilitation of discriminative learning, relative to that which followed exposures to stimulus and reinforcement sequences or exposures to stimulus sequences alone. Exposure to stimulus and food-delivery sequences enhanced performance relative to exposure to stimulus sequences alone. The differential effects of these three types of exposure were not attributable to order effects or to task difficulty; rather, they clearly were due to the type of exposure.
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ISSN 0022-5002 ISBN Medium
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Notes PMID:3746187 Approved no
Call Number refbase @ user @ Serial 853
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Author Zentall, T.R.; Jackson-Smith, P.; Jagielo, J.A.; Nallan, G.B.
Title Categorical shape and color coding by pigeons Type Journal Article
Year 1986 Publication Journal of experimental psychology. Animal behavior processes Abbreviated Journal (up) J Exp Psychol Anim Behav Process
Volume 12 Issue 2 Pages 153-159
Keywords Animals; *Color Perception; Columbidae; *Discrimination Learning; *Form Perception; *Generalization, Stimulus; Psychophysics; Transfer (Psychology)
Abstract Categorical coding is the tendency to respond similarly to discriminated stimuli. Past research indicates that pigeons can categorize colors according to at least three spectral regions. Two present experiments assessed the categorical coding of shapes and the existence of a higher order color category (all colors). Pigeons were trained on two independent tasks (matching-to-sample, and oddity-from-sample). One task involved red and a plus sign, the other a circle and green. On test trials one of the two comparison stimuli from one task was replaced by one of the stimuli from the other task. Differential performance based on which of the two stimuli from the other task was introduced suggested categorical coding rules. In Experiment 1 evidence for the categorical coding of sample shapes was found. Categorical color coding was also found; however, it was the comparison stimuli rather than the samples that were categorically coded. Experiment 2 replicated the categorical shape sample effect and ruled out the possibility that the particular colors used were responsible for the categorical coding of comparison stimuli. Overall, the results indicate that pigeons can develop categorical rules involving shapes and colors and that the color categories can be hierarchical.
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ISSN 0097-7403 ISBN Medium
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Notes PMID:3701264 Approved no
Call Number refbase @ user @ Serial 262
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