Loss of associability by a compound stimulus comprising excitatory and inhibitory elements

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In each of 2 experiments male hooded rats learned a discrimination between a stimulus (A) that signaled shock and a compound stimulus (AB) that signaled no shock. In Exp I (24 Ss) it was found that the AB compound acquired excitatory strength only slowly when, in a 2nd phase of training, it was made to signal the occurrence of shock. In Exp II (32 Ss) the acquisition of inhibitory strength by the compound was similarly found to be retarded. Exp II also replicated the results of Exp I. The relevance of these results to current theories of latent inhibition and attention is discussed. (16 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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