Rats were trained on a consistent reinforcement schedule in a straight runway. They were then switched to one of two partial reinforcement procedures. One group continued to run the full length of the runway, another was placed directly in the goal box. When extinguished in the full length of the runway both groups were more resistant to extinction than groups trained only on consistent reinforcement. An attempt was made to delineate the conditions for a demonstration of the partial reinforcement extinction effect. The results were discussed in relation to frustration theory.
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