Extinction in a runway as a function of acquisition level and reinforcement percentage.

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Abstract
Level of acquisition training (8, 16, 32, 64, and 128 trials) and percentage of food reinforcement (100% and 50% random) were combined factorially for 100 rats in a straight alley. Acquisition was by massed training and was followed by 28 trials of massed extinction on one day and 12 on the next. Running speed in late acquisition was an increasing function of training level, with no significant effect of percentage. Running speed early in extinction was also an increasing function of training. This effect disappeared as extinction progressed for the 100% but not for the 50% groups. These results do not support the hypothesis, suggested by previous studies, that resistance to extinction is and inverted U function of degree of training. (16 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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