In a series of three experiments, running speed in a single runway was found to increase following the omission of prefeeding when this was preceded by consistent prefeeding (Apparent Frustration Effect). A similar increase was also found in Ss which had not been previously prefed. It is suggested that the increased running speed of the previously nonprefed Ss resulted from either rapid generalization of reward expectation from the goalbox or simply from a change in stimulus conditions.
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