In fact though, the children who you reward later on think that this activity has less value and they are less likely to do it when there's no reward present.

但事实上，拿到奖励的孩子会想,这个活动的价值变低了，如果没有奖励,他们就不太可能会再做。

耶鲁公开课 - 心理学导论课程节选

And the idea, again, is the kids who don't get rewarded say to themselves, "Well, I just spent time doing it, it must have an intrinsic value," while the children who get rewarded say, "I did it for the sticker. I did it for the toy.

再一次，没有得到奖励的孩子心里想，“我花了时间来做这件事，它一定是有内在的价值的”,而拿到奖励的小孩会说，“我是为了贴纸和玩具才做的”

耶鲁公开课 - 心理学导论课程节选