Children as young as 14 months old will spontaneously help others for no reward. But a study of 3-to-5-year- olds found that, although they would spontaneously draw pictures, if they were given a reward for drawing pictures, then later they wouldn’t make any drawings unless a reward was offered.
14个月大的孩子会自发地无偿帮助别人。但一项针对3到5岁儿童的研究发现，尽管他们会自发地画画，但如果他们因为画画而得到奖励，那么后来他们就不会画画了，除非有奖励。
