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The effects of varying the spatial placement of sample and comparison stimuli of a matching-to-sample task were evaluated upon the acquisition and transfer (intramodal and extramodal) of a conditional discrimination by humans. Three groups of college students participated in the experiment. Between groups, four matching-relations were differentially correlated with four spatial placements of the comparison stimuli (Group 1), with four spatial placements of the sample stimuli (Group 2) or with four geometric shapes (Group 3). Performance in both intramodal and extramodal transfer tests was higher than an experimentally predefined criterion for most participants from Group 1. In the remaining groups only half of the participants reached a similar performance. These results agree with the classification of the paradigmatic cases of the selector function from the taxonomic proposal offered by Ribes and Lopez (1985) and suggest a positive effect of variability of training conditions upon the transfer of performance.

Efectos de variar la posición espacial de los estímulos en la adquisición y transferencia de discriminaciones condicionales en humanos.