Young Children's Differentiation of Hypothetical Beliefs from Evidence.

The claim that preadolescent children fail to differentiate between hypothetical beliefs and evidence is investigated in 2 studies. First-and second-grade children were presented with 2 conflicting hypotheses and asked to choose an empirical test to decide between them. In Study 1, the majority of first graders and almost all second graders correctly chose a conclusive test. They elaborated the logic of such a test and distinguished it from an inconclusive test. There was no evidence that children of this age misinterpret the task of hypothesis testing as one of generating a desirable effect. Study 2 replicated and extended these findings; in a task that posed a genuine scientific problem, first and second graders spontaneously generated empirical procedures for gathering indirect evidence to decide between alternative hypotheses. Our results indicate that young elementary school children distinguish between the notions of “hypothetical belief” and “evidence.” These findings are discussed in light of their failure on other scientific thinking tasks.

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