<p>This study aims to examine whether selective economic rewards are conducive to maintaining intrinsic motivation during activities. In Experiment 1, self-reported intrinsic motivation scores were significantly higher in the choice group compared to the no-choice group, as assessed through a survey task. Experiment 2 introduced a no-incentive condition and used a differential points task to collect behavioral indicators of intrinsic motivation. Additionally, reverse-scored items were included in the intrinsic motivation questionnaire to control for potential response biases. The results of Experiment 2 revealed that the choice group exhibited significantly higher self-reported intrinsic motivation and behavioral persistence compared to both the no-choice and no-incentive groups. In Experiment 3, the task was changed to a reading activity, and external motivation data were also collected from participants, ruling out motivational attribution errors as a confounding factor. Overall, the findings indicate that selective economic rewards help sustain intrinsic motivation during activities.</p>