Successive nonreinforcements (N-length) and resistance to extinction at spaced trials.

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Abstract
Investigated the effects of number of nonreinforced trials prior to reinforcement (N-length) at spaced trials. In Exp I with 32 male Sprague-Dawley albino rats, 120 acquisition trials were used, and in Exp II with an additional 32 Ss, 24 acquisition trials were used, both with an intertrial interval of 30 min. One half of each group ran in a gray runway and goal box and one half in the gray runway with a striped goal box. In the gray goal-box condition after 120 acquisition trials, Ss receiving N-lengths of 1, 2, and 3 were more resistant to extinction than Ss receiving only N-lengths of 3, but after 24 acquisition trials Group N3-length Ss were more resistant. In the striped goal-box condition there were no differences in resistance to extinction in either case. (15 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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