The effect of potential monetary reward upon performance of a heart-rate control task was evaluated. There were no significant differences in average heart-rate control between Ss who were offered payment for successful control and those who were not offered payment. Greater variability in performance was found among Ss who were offered payment as opposed to those who were not. This finding is discussed in relation to verbal reports made by Ss following experimental sessions. Some additional data on changes in performance over time on the heart-rate control task are presented.
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