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PREE. For the first 24 trials, the two choice options have different probabilities of reward (100 : 0, 75 : 25 or 67 : 33) before rewards for both options are set to zero. The rate of regression towards indifference between options during extinction is greater in the continuous reward (100 : 0) condition than in the partial reward conditions (75 : 25 and 67 : 33). (Online version in colour.)
