Abstract
Studied the acquisition of a straight-alley runway response in rats under 50% and 100% reinforcement. For the starting and running speed measures the 50% groups were inferior in the early trials but superior at the performance asymptote. For the goal box speed measure no 50% superiority developed. The 50% decrement lasted for greater numbers of trials as performance was measured closer to the goal box. The results were discussed in relation to Amsel''s frustration theory, although it was concluded that no existing theoretical schema provides an entirely adequate interpretation. 17 refs.
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