6 groups of 8 rats each were trained in a runway under conditions factorially combining three N-length sequences (increasing, random and decreasing) with signalled or unsignalled nonreinforcement. No acquisition differences were found, and in extinction only subjects in the increasing-unsignalled condition were more resistant to extinction than subjects in the companion groups. Results were interpreted as supporting a frustration, rather than a sequential, explanation of the partial reinforcement extinction effect.
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