Extrinsic rewards undermine altruistic tendencies in 20-month-olds.

  title={Extrinsic rewards undermine altruistic tendencies in 20-month-olds.},
  author={Felix Warneken and Michael Tomasello},
  journal={Developmental psychology},
  volume={44 6},
The current study investigated the influence of rewards on very young children's helping behavior. After 20-month-old infants received a material reward during a treatment phase, they subsequently were less likely to engage in further helping during a test phase as compared with infants who had previously received social praise or no reward at all. This so-called overjustification effect suggests that even the earliest helping behaviors of young children are intrinsically motivated and that… 

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