This study investigated the role of extended training of rats given various parameters of delayed reinforcement. There were no differences in terminal acquisition goal speeds among groups given 0-, 5-, 10-, and 20-sec. delayed reinforcement. In run speeds, similar results occurred for the first three groups, the 20-sec. group being in disagreement only with respect to asymptotic performance. It is proposed these late acquisition effects have not been considered in most learning models.
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