Gave 15 groups of 8 Sprague-Dawley rats each avoidance training in a runway. Each S was then blocked in the presence of the CS for either 1, 5, or 12 trials, each lasting for either 0, 5, 10, 50, or 120 sec. Results indicate that the greater the number of blocked trials and the greater the length of each blocked trial, the less the resistance to extinction. The key variable in determing the resistance to extinction was total blocking time as opposed to either the number of blocked trials or length of each blocked trial. (PsycINFO Database Record (c) 2006 APA, all rights reserved).
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Schiff et al. (1972) studied this question.
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