Stimulus control during the summation of conditioned suppression.

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Abstract
Trained 5 naive adult male hooded rats in a conditioned suppression paradigm where the variable-interval, base-line condition was correlated with the simultaneous presentation of tone and light (T + L). Conditioned stimuli, terminating with shock, were tone plus light-out (T + L) and light plus no tone (L + T). During compounding tests, all Ss exhibited strong summation of conditioned suppression to the absence of tone and light (T + L), i.e., they each emitted fewer responses to T + L than to either T + L or L + T. Results support the application of S. J. Weiss' (see 44:1) composite stimulus continuum attentional analysis to suppressive as well as additive summation and suggest the relevance of this analysis to both classical and free-operant summation designs. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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