Negative contrast effect as a function of magnitude of reward decrement
Tóm tắt
Five groups of 12 rats each were given 20 daily training trials in a straight runway and were rewarded with either 1, 2, 4, 8 or 16 20 mg food pellets, respectively. All groups were then shifted to 1 pellet reward for 14 additional trials. Performance during Training was an increasing monotonic function of the amount of reward. The magnitude of the negative contrast effect obtained in post-shift performance was directly related to the magnitude of reward decrement.
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