Abstract
Two groups of 16 rats were given several sessions of rewarded placements into the goal box prior to instrumental runway training. Group 4% received 4% sucrose solution and Group 36% received 36% sucrose solution upon each consummatory-experience placement. Both groups then were given 48, partially-reinforced (50%), instrumental trials with 36% sucrose solution as reward. No contrast effect was found as Group 36% ran faster than Group 4% throughout instrumental training.
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