In previous studies that dealt with rule learning, experimenters gave learners new instances in a test session. In those tests, which the present author calls “rule application in judgment level (L1)”, the matter of interest was whether or not learners could apply the rule to the new instances. The present study proposes another type of rule application. Suppose that, after learning a rule, learners, by themselves, incidentally find out about a new fact or a new phenomenon, and guess that the rule might possibly be applied to it. This mental activity can be considered to be a rule application, which the present author calls “rule application in hypothesis production level (L2)”. Tasks assessing L2 have not been used in previously published studies. The purposes of the present study were to develop a task to assess L2 and to find a method to facilitate L2 in learners. Undergraduates (
N=97 in Experimental 1;
N=41 in Experiment 2) were taught the following rule: “substances that glitter like metal can conduct electricity”, after which a target instance (antimony in Experiment 1, and polyacetylene in Experiment 2) was introduced. To assess L2, the participants were asked what characteristics of the target instance they wanted to explore. To assess L1, they were asked whether or not the target instance conducted electricity. The results indicated that L2 was more difficult than L1, and that L2 was facilitated if, in the learning session, learners were given a fact, such as that pencil leads, which have a nature similar to the target instance, can conduct electricity.
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