Effects of trace versus delay conditioning, interstimulus interval variability, and instructions on UCR diminution.

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Abstract
Subjected 10 groups of 10 undergraduates each to paired or unpaired presentations of a light cs and a shock ucs. Experimental conditions included a delay conditioning or trace paradigm, an interstimulus interval (isi) of constant or variable length, and informative or noninformative instructions about stimulus relations prior to acquisition training. All ss received 30 acquisition trials followed by 8 recovery trials on which the ucs was presented alone. Both trace and delay conditioning groups demonstrated significantly greater ucr recovery than their control groups; the effect of cs duration on recovery was not significant. A variable isi was found to produce less ucr recovery than a constant isi, an effect which was offset by informative instructions. Results support a preparatory set explanation of ucr diminution. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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