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Sixteen rats were trained in a two-lever box, normally with one lever available at a time. Two levers differed in the reinforcement schedule (random vs. single alternating sequences) and the subjects were trained for 29 days with successive two blocks of 17 trials on each lever. Prior to the daily training a lever-choice test trial was performed twice. In extinction, rats were extinguished either on formerly random or alternating-sequence lever. At the end of acquisition, an appreciable preference for the random-sequence lever was observed. Rats also showed a clear patterning on the alternating-sequence lever, responding significantly faster on the reinforced than on the non-reinforced trials. However, no difference was observed during extinction between groups of rats extinguished on a lever of different sequence.

UNCERTAINTY OF REINFORCEMENT AS A DETERMINANT OF LEVER CHOICE AND RESISTANCE TO EXTINCTION IN RATS