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Lombardi, C. |
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Title |
Matching and oddity relational learning by pigeons ( Columba livia ): transfer from color to shape |
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Animal Cognition |
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Anim. Cogn. |
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Abstract Relational learning, as opposed to perceptual learning, is based on the abstract properties of the stimuli. Although at present there is no doubt that pigeons are capable of relational behavior, this study aims to further disclose the conditions under which it occurs. Pigeons were trained in an outdoor cage on a matching-to-sample or an oddity-from-sample task, with colored cardboard stimuli presented horizontally. The apparatus involved three sliding lids on which the stimuli were drawn and which, when displaced, revealed the reinforcement. The lids were either adjacent to each other or somewhat separated. Training sessions involved two colors, and test sessions six different colors (same dimension test), or six different shapes (different dimension test). One group of birds trained under the “adjacent” condition failed when tested with new stimuli, but succeeded in both dimension tests after training under the “separate” condition. Two other groups of birds succeeded in all tests after training under the latter condition. These results show that depending on procedural details, pigeons are or are not able to transfer from one visual dimension to another, thus extending previous related findings. |
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Equine Behaviour @ team @ |
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3270 |
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Sousa, C.; Matsuzawa, T. |
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The use of tokens as rewards and tools by chimpanzees (Pan troglodytes) |
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2001 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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4 |
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3 |
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213-221 |
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This paper explores the effectiveness of token rewards in maintaining chimpanzees ( Pan troglodytes) in working at intellectually costly tasks, and studies the “saving” behavior of the subjects, investigating the factors that can condition it. Two experiments were run. Tokens were introduced as rewards in a matching-to-sample task and used as exchange tools for food by three adult female chimpanzees. Subjects' performances were maintained at constant high levels of accuracy, suggesting that the tokens were almost equivalent to direct food rewards. The results also showed the emergence of saving behavior. The subjects spontaneously saved the tokens during the matching-to-sample task before exchanging them for food. The chimpanzees also learned a new symbolic discrimination task, with tokens as the reward. During this learning process a rarely reported phenomenon emerged: one of the subjects showed symmetry, a form of stimulus equivalence. |
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Equine Behaviour @ team @ |
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3280 |
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Werner, C.; Rehkämper, G. |
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Categorization of multidimensional geometrical figures by chickens (Gallus gallus f. domestica): fit of basic assumptions from exemplar, feature and prototype theory |
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2001 |
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Animal Cognition |
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Anim. Cogn. |
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4 |
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1 |
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37-48 |
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Five hens, experienced in discrimination of two categories of multidimensional geometrical figures presented in fixed pairs in a simultaneous discrimination, were tested with familiar figures arranged as new pairs to assess the dependence of categorization performance on learned relational or configural cues. Test performance did not differ from training: relational or configural cues still influenced discrimination performance. It was suggested that – in accordance with exemplar theories – this influence depended on differences between pairs of probe exemplars that facilitate retrieval of learned category members. To test whether exemplar, feature or prototype theory was most suitable to explain categorization by chickens, the rates of pecking at exemplars were analysed using principal components analysis (PCA). The distribution of the exemplars' component loads on the single component obtained was examined in the light of the conditions dictated by the three types of theories on how representative category exemplars should be. The least constraining theory, i.e. the exemplar theory, was most suitable. Defining factors of classificatory behaviour are discussed with a special emphasis on the characteristics of category-defining stimulus attributes. |
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Equine Behaviour @ team @ |
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3301 |
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Author |
Westergaard, G.C. |
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Structural analysis of tool-use by tufted capuchins (Cebus apella) and chimpanzees (Pan troglodytes) |
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1999 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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2 |
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3 |
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141-145 |
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Using Matsuzawa's hierarchical system of classification, I compared tool-use patterns of tufted capuchins (Cebus apella) to those of chimpanzees (Pan troglodytes). The results indicated that wild C. apella exhibit fewer and less complex tool-use patterns than do captive C. apella and wild and captive P. troglodytes. Although most patterns of tool-use observed among P. troglodytes occur in captive C. apella, there are some notable exceptions, including tool-use in communicative contexts and the use ¶of three-tool combinations. I conclude that C. apella are unique among monkeys in their demonstrated propensities for higher-order combinatorial behavior and are likely capable of using symbolic combinations, although not at the level of complexity that has been demonstrated in ¶P. troglodytes. |
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Equine Behaviour @ team @ |
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3324 |
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Doucette, T.A.; Ryan, C.L.; Tasker, R.A. |
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Gender-based changes in cognition and emotionality in a new rat model of epilepsy |
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2007 |
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Amino Acids |
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32 |
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317-322 |
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3404 |
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Bizot J.-C.; Thiebot M.-H. |
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Impulsivity as a confounding factor in certain animal tests of cognitive function |
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1996 |
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Cognitive Brain Research |
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3 |
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243-250 |
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3450 |
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Weed M.R.; Taffe M.A.; Polis I.; Roberts A.C.; Robbins T.W.; Koob G.F.; Bloom F.E.; Gold L.H. |
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Performance norms for a rhesus monkey neuropsychological testing battery: acquisition and long-term performance |
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1999 |
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Cognitive Brain Research |
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8 |
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185-201 |
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3459 |
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Quinn P.C.; Eimas P.D.; Tarr M.J. |
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Perceptual Categorization of Cat and Dog Silhouettes by 3- to 4-Month-Old Infants |
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2001 |
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Journal of Experimental Child Psychology |
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79 |
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78-94 |
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3474 |
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Tavares M.C.H.; Tomaz C. |
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Working memory in capuchin monkeys (Cebus apella) |
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2002 |
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Behavioural Brain Research |
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Behav. Brain. Res. |
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131 |
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131-137 |
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3486 |
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Held, S.; Mendl, M.; Devereux, C.; Byrne, R.W. |
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Studies in Social Cognition: From Primates to Pigs |
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2001 |
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Animal Welfare |
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10 |
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209-217 |
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3494 |
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