This paper investigates the role of analogies in logical reasoning as an important aspect of scientific thinking. In particular, we studied the role of analogical reasoning in the solution of Piagetian concrete operational tasks. Halford (1993) has suggested that 4- to 5-year olds should be able to solve Piagetian class inclusion tasks on the basis of analogies to the relational structure of the nuclear family. This idea was tested in two studies. Analogy effects on class inclusion reasoning were indeed found. These effects were strengthened by the provision of hints to use an analogy and by deeper initial processing of the relational structure of the analogy. The family analogy was applied equally to sets of natural kinds and artifacts. These results suggest that children use familiar relational structures as a basis for logical reasoning. It seems likely that analogies will be core to scientific reasoning as well.
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