Overlearning-extinction effect as an incentive phenomenon.

Abstract
Three of 12 rats each were trained and extinguished in a runway. Group 10-10 received 10 rewarded training trials. Group 60-60 received 60 rewarded training trials. Group 10-60 received 10 training trials and 60 rewards. An overlearning effect in extinction was found only when the groups differed in number of rewards. Group 10-10 was more resistant to extinction than Group 60-60, but Group 60-60 was more resistant than Group 10-60. The data suggest that the over-learning effect is a result of the operation of incentive motivation.

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