Establishment in rats of a persistent response producing a net loss of reinforcement.

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Abstract
Hungry rats trained on 48 or more trials to run down an empty alley for a .15 gm. pellet of food in the goal box ran over a pile of pellets to the goal box, even after eating from the pile of food in the middle of the alley. Ss with previous training persisted in running to the goal box longer than Ss without previous training (p<.05). Removal of the goal box pellet during test trials increased retracing, but did not decrease persistence of running to the goal box. 9 of 28 trained Ss ran over the pile of food 55 or more trials before meeting a criterion; none of 5 untrained Ss ran that long. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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