The Debate About Rewards and Intrinsic Motivation: Protests and Accusations Do Not Alter the Results
Cameron and Pierce's rejoinder argues that entering several effect sizes from one experiment into a single analysis is a serious statistical violation, and converts their own effect size for the one harmful condition into time: for the average person promised a tangible reward not tied to performance, about 41 seconds less on the task in an eight-minute free period once the reward procedure is withdrawn.
Cameron and Pierce's rejoinder argues that entering several effect sizes from one experiment into a single analysis is a serious statistical violation, and converts their own effect size for the one harmful condition into time: for the average person promised a tangible reward not tied to performance, about 41 seconds less on the task in an eight-minute free period once the reward procedure is withdrawn.
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Cameron, J., & Pierce, W. D. (1996). The Debate About Rewards and Intrinsic Motivation: Protests and Accusations Do Not Alter the Results. Review of Educational Research, 66(1), 39-51.