Monetary rewards for healthy behavior can pay off both in the pocketbook and in positive psychological factors like internal motivation, according to a new ¾«Æ·SMÔÚÏßӰƬ study. While programs involving monetary incentives to encourage healthy behavior have become more popular in recent years, the evidence has been mixed as to how they can be most effective and how participants fare once the incentives stop, said CU-Boulder doctoral student Casey Gardiner, who led the new study.