Abstract
Summary A colour discrimination was learned in fewer trials using a single positive with seven, rather than two, negative stimuli. This finding was not due to position habits being broken down more readily when more stimuli were used. An explanation in terms of differences in the aversiveness of the unreinforced stimuli in the two situations is offered. With two negative stimuli the probability of a correct response occurring by chance is greater than with eight, therefore with two negative stimuli fewer errors are made initially and these are associated closely in time with rewarded responses; the negative stimulus may then be less aversive for this group.
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