The truly random control procedure: Conditioning to the static cues.

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Abstract
Conducted 2 experiments using a total of 48 male hooded rats in a conditioned emotional response paradigm, to examine the course of conditioning to the nominal CS and to the static cues during treatment with truly random control procedures of either high- or low-stimulus density. With the high-density schedule, response suppression to presentation of the nominal CS and to the static cues increased as a function of the duration of exposure to the schedule. Also, there was evidence that some interaction between nominal CS and static cues occurred in testing. Treatment with the low-density schedule also produced response suppression to the nominal CS and to the static cues, but suppression to the nominal CS failed to persist after extinction of responding to static cues, suggesting that the nominal CS had not acquired any conditioned properties. Implications of these results for R. A. Rescorla and A. R. Wagner's model of Pavlovian conditioning are discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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