Abstract
Hooded crows were trained in two-alternative simultaneous matching and oddity tasks with stimulus sets of three different categories: color (black and white), shape (Arabic Numerals 1 and 2, which were used as visual shapes only), and number of elements (arrays of one and two items). These three sets were used for training successively and repeatedly; the stimulus set was changed to the next one after the criterion (80% correct or better over 30 consecutive trials) was reached with the previous one. Training was continued until the criterion could be reached within the first 30 to 50 trials for each of the three training sets. During partial transfer tests, familiar stimuli (numerals and arrays in the range from 1 to 2) were paired with novel ones (numerals and arrays in the range from 3 to 4). At the final stage of testing only novel stimuli were presented (numerals and arrays in the range from 5 to 8). Four of 6 birds were able to transfer in these tests, and their performance was significantly above chance. Moreover, performance of the birds on the array stimuli did not differ from their performance on the color or shape stimuli. They were capable of recognizing the number of elements in arrays and comparing the stimuli by this attribute. It was concluded that crows were able to apply the matching (or oddity) concept to stimuli of numerical category.
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Selected References
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- Carter D. E., Werner T. J. Complex learning and information processing by pigeons: a critical analysis. J Exp Anal Behav. 1978 May;29(3):565–601. doi: 10.1901/jeab.1978.29-565. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Farthing G. W., Opuda M. J. Transfer of matching-to-sample in pigeons. J Exp Anal Behav. 1974 Mar;21(2):199–213. doi: 10.1901/jeab.1974.21-199. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kamil A. C. A synthetic approach to the study of animal intelligence. Nebr Symp Motiv. 1987;35:257–308. [PubMed] [Google Scholar]
- Karten H. J. Homology and evolutionary origins of the 'neocortex'. Brain Behav Evol. 1991;38(4-5):264–272. doi: 10.1159/000114393. [DOI] [PubMed] [Google Scholar]
- Mandler G., Shebo B. J. Subitizing: an analysis of its component processes. J Exp Psychol Gen. 1982 Mar;111(1):1–22. doi: 10.1037//0096-3445.111.1.1. [DOI] [PubMed] [Google Scholar]
- Oden D. L., Thompson R. K., Premack D. Spontaneous transfer of matching by infant chimpanzees (Pan troglodytes). J Exp Psychol Anim Behav Process. 1988 Apr;14(2):140–145. [PubMed] [Google Scholar]
- Zorina Z. A., Smirnova A. A. Quantitative evaluations in gray crows: generalization of the relative attribute "larger set". Neurosci Behav Physiol. 1996 Jul-Aug;26(4):357–364. doi: 10.1007/BF02359040. [DOI] [PubMed] [Google Scholar]