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Author |
Gibson, B.M.; Shettleworth, S.J. |
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Title |
Competition among spatial cues in a naturalistic food-carrying task |
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Journal Article |
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Year |
2003 |
Publication |
Learning & behavior : a Psychonomic Society publication |
Abbreviated Journal |
Learn Behav |
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Volume |
31 |
Issue |
2 |
Pages |
143-159 |
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Keywords |
Adaptation, Psychological; Animals; Appetitive Behavior; *Association Learning; *Attention; Choice Behavior; *Cues; *Discrimination Learning; Male; Rats; Rats, Long-Evans; Space Perception; *Spatial Behavior |
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Abstract |
Rats collected nuts from a container in a large arena in four experiments testing how learning about a beacon or cue at a goal interacts with learning about other spatial cues (place learning). Place learning was quick, with little evidence of competition from the beacon (Experiments 1 and 2). Rats trained to approach a beacon regardless of its location were subsequently impaired when the well-learned beacon was removed and other spatial cues identified the location of the goal (Experiment 3). The competition between beacon and place cues reflected learned irrelevance for place cues (Experiment 4). The findings differ from those of some studies of associative interactions between cue and place learning in other paradigms. |
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University of Toronto, Toronto, Ontario, Canada |
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1543-4494 |
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PMID:12882373 |
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no |
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Call Number |
refbase @ user @ |
Serial |
368 |
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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? |
Type |
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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Abstract |
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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PMID:1619395 |
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no |
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Call Number |
refbase @ user @ |
Serial |
381 |
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Author |
Stoinski, T.S.; Wrate, J.L.; Ure, N.; Whiten, A. |
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Title |
Imitative learning by captive western lowland gorillas (Gorilla gorilla gorilla) in a simulated food-processing task |
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Journal Article |
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Year |
2001 |
Publication |
Journal of comparative psychology (Washington, D.C. : 1983) |
Abbreviated Journal |
J Comp Psychol |
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Volume |
115 |
Issue |
3 |
Pages |
272-281 |
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Animals; Behavior, Animal/physiology; *Discrimination Learning; Feeding Behavior/*physiology; Gorilla gorilla; *Imitative Behavior; Social Behavior |
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Although field studies have suggested the existence of cultural transmission of foraging techniques in primates, identification of transmission mechanisms has remained elusive. To test experimentally for evidence of imitation in the current study, we exposed gorillas (Gorilla gorilla gorilla) to an artificial fruit foraging task designed by A. Whiten and D. M. Custance (1996). Gorillas (n=6) watched a human model remove a series of 3 defenses around a fruit. Each of the defenses was removed using 1 of 2 alternative techniques. Subsequent video analysis of gorillas' behavior showed a significant tendency to copy the observed technique on 1 of the individual defenses and the direction of removal on another defense. This is the first statistically reliable evidence of imitation in gorillas. Sequence of defense removal was not replicated. The gorillas' responses were most similar to those of chimpanzees. |
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TECHlab, Zoo Atlanta, Georgia 30315, USA. stoinskit@mindspring.com |
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0735-7036 |
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PMID:11594496 |
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no |
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Call Number |
refbase @ user @ |
Serial |
738 |
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Author |
Boysen, S.T.; Bernston, G.G.; Hannan, M.B.; Cacioppo, J.T. |
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Title |
Quantity-based interference and symbolic representations in chimpanzees (Pan troglodytes) |
Type |
Journal Article |
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Year |
1996 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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Volume |
22 |
Issue |
1 |
Pages |
76-86 |
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Keywords |
Animals; Behavior, Animal; Cognition; *Discrimination Learning; Female; Male; *Pan troglodytes; *Reinforcement (Psychology); Task Performance and Analysis |
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Abstract |
Five chimpanzees with training in counting and numerical skills selected between 2 arrays of different amounts of candy or 2 Arabic numerals. A reversed reinforcement contingency was in effect, in which the selected array was removed and the subject received the nonselected candies (or the number of candies represented by the nonselected Arabic numeral). Animals were unable to maximize reward by selecting the smaller array when candies were used as array elements. When Arabic numerals were substituted for the candy arrays, all animals showed an immediate shift to a more optimal response strategy of selecting the smaller numeral, thereby receiving the larger reward. Results suggest that a response disposition to the high-incentive candy stimuli introduced a powerful interference effect on performance, which was effectively overridden by the use of symbolic representations. |
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Ohio State University, Department of Psychology, Ohio State University, Columbus 43210-1222, USA |
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0097-7403 |
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PMID:8568498 |
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no |
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Equine Behaviour @ team @ |
Serial |
2781 |
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Author |
Lazareva, O.F.; Smirnova, A.A.; Bagozkaja, M.S.; Zorina, Z.A.; Rayevsky, V.V.; Wasserman, E.A. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Transitive responding in hooded crows requires linearly ordered stimuli |
Type |
Journal Article |
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Year |
2004 |
Publication |
Journal of the experimental analysis of behavior |
Abbreviated Journal |
J Exp Anal Behav |
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Volume |
82 |
Issue |
1 |
Pages |
1-19 |
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Keywords |
Animals; *Association; Cognition/physiology; Crows; Discrimination (Psychology); *Discrimination Learning; Feedback; Reinforcement (Psychology); Visual Perception/physiology |
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Eight crows were taught to discriminate overlapping pairs of visual stimuli (A+ B-, B+ C-, C+ D-, and D+ E-). For 4 birds, the stimuli were colored cards with a circle of the same color on the reverse side whose diameter decreased from A to E (ordered feedback group). These circles were made available for comparison to potentially help the crows order the stimuli along a physical dimension. For the other 4 birds, the circles corresponding to the colored cards had the same diameter (constant feedback group). In later testing, a novel choice pair (BD) was presented. Reinforcement history involving stimuli B and D was controlled so that the reinforcement/nonreinforcement ratios for the latter would be greater than for the former. If, during the BD test, the crows chose between stimuli according to these reinforcement/nonreinforcement ratios, then they should prefer D; if they chose according to the diameter of the feedback stimuli, then they should prefer B. In the ordered feedback group, the crows strongly preferred B over D; in the constant feedback group, the crows' choice did not differ significantly from chance. These results, plus simulations using associative models, suggest that the orderability of the postchoice feedback stimuli is important for crows' transitive responding. |
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Institute of Higher Nervous Activity, Moscow State University. olga-lazareva@uiowa.edu |
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0022-5002 |
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PMID:15484868 |
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no |
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refbase @ user @ |
Serial |
612 |
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Author |
Dougherty, D.M.; Lewis, P. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Stimulus generalization, discrimination learning, and peak shift in horses |
Type |
Journal Article |
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Year |
1991 |
Publication |
Journal of the experimental analysis of behavior |
Abbreviated Journal |
J Exp Anal Behav |
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Volume |
56 |
Issue |
1 |
Pages |
97-104 |
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Keywords |
Animals; *Appetitive Behavior; Attention; *Conditioning, Operant; *Discrimination Learning; Female; *Generalization, Stimulus; Horses/*psychology; Male; *Pattern Recognition, Visual; Size Perception |
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Using horses, we investigated three aspects of the stimulus control of lever-pressing behavior: stimulus generalization, discrimination learning, and peak shift. Nine solid black circles, ranging in size from 0.5 in. to 4.5 in. (1.3 cm to 11.4 cm) served as stimuli. Each horse was shaped, using successive approximations, to press a rat lever with its lip in the presence of a positive stimulus, the 2.5-in. (6.4-cm) circle. Shaping proceeded quickly and was comparable to that of other laboratory organisms. After responding was maintained on a variable-interval 30-s schedule, stimulus generalization gradients were collected from 2 horses prior to discrimination training. During discrimination training, grain followed lever presses in the presence of a positive stimulus (a 2.5-in circle) and never followed lever presses in the presence of a negative stimulus (a 1.5-in. [3.8-cm] circle). Three horses met a criterion of zero responses to the negative stimulus in fewer than 15 sessions. Horses given stimulus generalization testing prior to discrimination training produced symmetrical gradients; horses given discrimination training prior to generalization testing produced asymmetrical gradients. The peak of these gradients shifted away from the negative stimulus. These results are consistent with discrimination, stimulus generalization, and peak-shift phenomena observed in other organisms. |
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Department of Psychology, Ohio University, Athens 45701 |
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0022-5002 |
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PMID:1940765 |
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no |
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Serial |
1764 |
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Author |
Biederman, G.B.; Robertson, H.A.; Vanayan, M. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Observational learning of two visual discriminations by pigeons: a within-subjects design |
Type |
Journal Article |
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Year |
1986 |
Publication |
Journal of the experimental analysis of behavior |
Abbreviated Journal |
J Exp Anal Behav |
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46 |
Issue |
1 |
Pages |
45-49 |
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Animals; Attention; Columbidae; Conditioning, Operant; Cues; *Discrimination Learning; *Imitative Behavior; Male; Visual Perception |
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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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0022-5002 |
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PMID:3746187 |
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refbase @ user @ |
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853 |
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Author |
Hanggi, E.B.; Ingersoll, J.F.; Waggoner, T.L. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Color vision in horses (Equus caballus): deficiencies identified using a pseudoisochromatic plate test |
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Journal Article |
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Year |
2007 |
Publication |
Journal of Comparative Psychology |
Abbreviated Journal |
J. Comp. Psychol. |
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Volume |
121 |
Issue |
1 |
Pages |
65-72 |
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Animals; Appetitive Behavior; *Color Perception; Color Perception Tests/veterinary; *Discrimination Learning; Female; Horses/*psychology; Male; Sensitivity and Specificity |
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In the past, equine color vision was tested with stimuli composed either of painted cards or photographic slides or through physiological testing using electroretinogram flicker photometry. Some studies produced similar results, but others did not, demonstrating that there was not yet a definitive answer regarding color vision in horses (Equus caballus). In this study, a pseudoisochromatic plate test--which is highly effective in testing color vision both in small children and in adult humans--was used for the first time on a nonhuman animal. Stimuli consisted of different colored dotted circles set against backgrounds of varying dots. The coloration of the circles corresponded to the visual capabilities of different types of color deficiencies (anomalous trichromacy and dichromacy). Four horses were tested on a 2-choice discrimination task. All horses successfully reached criterion for gray circles and demonstration circles. None of the horses were able to discriminate the protan-deutan plate or the individual protan or deutan plates. However, all were able to discriminate the tritan plate. The results suggest that horses are dichromats with color vision capabilities similar to those of humans with red-green color deficiencies. |
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Equine Research Foundation, Aptos, CA 95001, USA. EquiResF@aol.com |
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0735-7036 |
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PMID:17324076 |
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refbase @ user @ ; Equine Behaviour @ team @ room B 3.029 |
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1972 |
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Author |
Pepperberg, I.M.; Brezinsky, M.V. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size |
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Journal Article |
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Year |
1991 |
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Journal of Comparative Psychology |
Abbreviated Journal |
J Comp Psychol |
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105 |
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3 |
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286-294 |
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Animals; Aptitude; *Concept Formation; *Discrimination Learning; Form Perception; Male; Mental Recall; *Parrots; *Size Perception; Vocalization, Animal |
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We report that an African gray parrot (Psittacus erithacus), Alex, responds to stimuli on a relative basis. Previous laboratory studies with artificial stimuli (such as pure tones) suggest that birds make relational responses as a secondary strategy, only after they have acquired information about the absolute values of the stimuli. Alex, however, after learning to respond to a small set of exemplars on the basis of relative size, transferred this behavior to novel situations that did not provide specific information about the absolute values of the stimuli. He responded to vocal questions about which was the larger or smaller exemplar by vocally labeling its color or material, and he responded “none” if the exemplars did not differ in size. His overall accuracy was 78.7%. |
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Northwestern University |
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Washington, D.C. : 1983 |
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0735-7036 |
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PMID:1935007 |
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yes |
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Equine Behaviour @ team @ |
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3610 |
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Author |
Topál, J.; Byrne, R.W.; Miklósi, Á.; Csányi, V. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Reproducing human actions and action sequences: “Do as I Do!” in a dog |
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Journal Article |
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2006 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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9 |
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4 |
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355-367 |
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Animals; *Comprehension; Conditioning, Operant; *Discrimination Learning; Dogs/*psychology; Humans; *Imitative Behavior; Male; *Serial Learning |
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We present evidence that a dog (Philip, a 4-year-old tervueren) was able to use different human actions as samples against which to match his own behaviour. First, Philip was trained to repeat nine human-demonstrated actions on command ('Do it!'). When his performance was markedly over chance in response to demonstration by one person, testing with untrained action sequences and other demonstrators showed some ability to generalise his understanding of copying. In a second study, we presented Philip with a sequence of human actions, again using the 'Do as I do' paradigm. All demonstrated actions had basically the same structure: the owner picked up a bottle from one of six places; transferred it to one of the five other places and then commanded the dog ('Do it!'). We found that Philip duplicated the entire sequence of moving a specific object from one particular place to another more often than expected by chance. Although results point to significant limitations in his imitative abilities, it seems that the dog could have recognized the action sequence, on the basis of observation alone, in terms of the initial state, the means, and the goal. This suggests that dogs might acquire abilities by observation that enhance their success in complex socio-behavioural situations. |
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Comparative Ethology Research Group, Hungarian Academy of Sciences, Budapest, Pazmany, P. 1/c H-1117, Hungary. kea@t-online.hu |
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1435-9448 |
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PMID:17024511 |
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Equine Behaviour @ team @ |
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2434 |
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