Abstract
The results from five experiments are considered in relation to two of Spence’s (1937, 1938) proposals concerning discrimination learning. In Experiments 1 and 2, we investigated whether his ideas about the interaction between excitatory and inhibitory generalization gradients can be used to understand how animals solve a complex patterning discrimination. The results supported a development of his proposals as put forward by Pearce (1994), provided a modification was made to Pearce’s rule for determining the shape of the generalization gradient. In Experiments 3, 4, and 5, we examined whether animals would pay more attention to stimuli that are relevant, rather than irrelevant, to the solution of a discrimination. The results supported this proposal for stimuli comprising visual patterns, but not for those comprising plain colors. The results also indicated that change of attention was a consequence of preliminary receptor-exposure acts, as envisaged by Spence, and not of more central changes in attention.
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This research was supported by grants from the U.K. Biotechnology and Biological Sciences Research Council and a Royal Society University Research Fellowship.
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Pearce, J.M., Esber, G.R., George, D.N. et al. The nature of discrimination learning in pigeons. Learning & Behavior 36, 188–199 (2008). https://doi.org/10.3758/LB.36.3.188
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DOI: https://doi.org/10.3758/LB.36.3.188