2003
DOI: 10.1080/02724990344000006
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Interaction between preexposure and overshadowing: Further analysis of the extended comparator hypothesis

Abstract: Three experiments with rats used conditioned suppression of barpress to test predictions of the extended comparator hypothesis, which assumes that the effectiveness of (first-order) comparator stimuli in modulating responding to a target conditioned stimulus (CS) is itself modulated by other (second-order) comparator stimuli. Experiment 1 demonstrated that both pretraining exposure to the target CS alone (i.e., CS-preexposure effect, also known as latent inhibition) and pretraining exposure to a compound of th… Show more

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Cited by 13 publications
(18 citation statements)
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“…As implemented, the training context also acts as the target cue's first-order comparator stimulus, and the overshadowing cue serves as the target cue's second-order comparator stimulus. Simulation of Experiment 1 after Savastano, Arcediano, Stout, and Miller's (2003) implementation of the extended comparator hypothesis. All parameters were the same as those used by Savastano, Arcediano, and colleagues, and the numbers of trials were the same as those used in Experiment 1 of the present series of studies.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…As implemented, the training context also acts as the target cue's first-order comparator stimulus, and the overshadowing cue serves as the target cue's second-order comparator stimulus. Simulation of Experiment 1 after Savastano, Arcediano, Stout, and Miller's (2003) implementation of the extended comparator hypothesis. All parameters were the same as those used by Savastano, Arcediano, and colleagues, and the numbers of trials were the same as those used in Experiment 1 of the present series of studies.…”
Section: Discussionmentioning
confidence: 99%
“…This prediction is illustrated in Figure 2, which depicts simulations of simple acquisition, overshadowing, the degraded contingency effect, and the interaction of overshadowing and degraded contingency. We used Savastano, Arcediano, et al's (2003; see also Stout & Miller, 2005) mathematical implementation of the extended comparator hypothesis, including exactly their parameters and the number of trials used in the present Experiment 1. As shown in Figure 2, the simulation indicates that when both treatments are presented together, a partial recovery from overshadowing and from degraded contingency is predicted.…”
mentioning
confidence: 99%
“…Therefore, preexposure should result in less overshadowing. Savastano, Arcediano, Stout, and Miller (2003) showed how a mathematical version of the extended comparator hypothesis can explain experimental results showing that preexposure and overshadowing cancel each other. In their simulations, responding in the PRE ϩ OVER group is 20% and 6% stronger than in the OVER and the PRE ϩ CON groups, respectively, whereas in our simulations, these ratios are 47% and 65%.…”
Section: Latent Inhibition and Overshadowing Counteract Each Othermentioning
confidence: 99%
“…While formalization of the comparator hypothesis has not yet been completed (e.g. Savastano et al, 2003), it is important to determine whether the absence of inhibition in it restricts the kinds of problems that it can solve, as it would in a perceptron.…”
Section: Multilayer Implicationsmentioning
confidence: 99%