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Fifty years ago, in an experiment by Zeaman2, rats were trained to run to a goal, for which they received a large reward. They were then shifted suddenly to a small reward. A second group of rats was trained the other way round; that is, they were first given a small reward and then shifted to a larger one. The animals that were shifted from a small to a larger reward immediately ran faster than would have been expected if the large reward were used alone. Conversely, those rats shifted from a large to a small reward ran more slowly than would have been expected with the small reward alone. The results indicated 


Fifty years ago ratz ran az fazt az humanz