Abstract
32 goldfish were classically conditioned in a respiratory conditioning situation with shock as the US and a temporary cessation of breathing as the UR. The CS was a light, a click, or a light-click compound stimulus. Fish in all four groups had classical conditioning trials with the light-click compound as CS. The groups were differentiated by additional classical conditioning with one of the elements of the compound as CS (Group 1), no presentations of the individual elements of the compound or the US (Group 2), random presentations of the US (Group 3), and non-rewarded presentations of one of the elements of the compound (Group 4). When tested with the element of the compound that was not presented alone to any of the groups during training, Group 1 showed the least evidence for conditioning, Groups 2 and 3 intermediare levels of conditioning, and Group 4 the greatest evidence for conditioning. The results were discussed in relation to hypotheses regarding continuity and attention as interpretations of cue-validity studies.
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