COGNITIVE EVALUATION THEORY AND THE STUDY OF HUMAN MOTIVATION
This book was conceived as an opportunity to bring together recent researches into the detrimental effects of extrinsic rewards on motivation and performance. Our work has been concerned only with motivation-indeed, primarily with intrinsic motivation. Further, although much of our work has shown that extrin sic rewards do have a detrimental effect on a person’s intrinsic motivation, some results have indicated that rewards may leave unchanged or even enhance intrin sic motivation. Thus, we outline a series of studies that have investigated the effects of extrinsic rewards on intrinsic motivation, showing that under varying conditions, extrinsic rewards may enhance, diminish, or maintain intrinsic motivation.