Overlearning reversal effect and magnitude of reward.

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Abstract
Con-flicting results on effects of overlearning on reversal learning may result from incentive differences. A model postulates overlearning reversal effect (ORE) to be a joint function of reward magnitude and number of original training trials. In Experiment 1, 40 rats were given 30 or 90 trials in a [tau] maze with large or small reward. Large reward groups showed ORE, but small reward groups did not. In Experiment 2, 60 rats were given small or large reward, with 15 training trials following 0 trials, 50 trials, or 50 rewarded goal-box placements. There were no significant differences among large reward groups, but with small reward, overlearning significantly retarded reversal. Data from Experiment 2 compared well with predictions from the model.

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