4 groups of 10 rats were trained in a runway for 0, 5, 10, or 15 small rewarded (2 pellets) trials prior to being shifted to large reward (24 pellets) for the remainder of 45 trials. Acquisition performance was slower for small than for large reward during the early trials but the groups were not different by the end of acquisition. Resistance to extinction was an increasing linear function of the number of small rewarded trials.
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