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Bricker et al. (2006) found children as young as 10 years old were more likely to try smoking if one of their friends have. (bgfbgfg2006)
Lewis (1995) found students from a Japanese elementary school were internally motivated and got very high grades.
Dweck (1975) compared two groups of children; one group had been praised for good work on a maths test and the other had not. The group that had not been rewarded ended up putting less work into future tests.
Lepper et al. (1973) researched the effort children put into drawing a picture when they were offered a reward and when not. He found that the kids spent more time on their pictures when they were not motivated by rewards.