Abstract: The purpose of this study was to explore the general process ofconcept formation. Two groups were tested; one consisted of 72 Chineseand the other, 72 American subjects, totalling 144 in all. Two groups oftest materials were used in the experiment. One was Chinese characterhypothesis testing model, and the other was English hypothesis testingmodel. The results show that the concept formation process is a gradual-mutative process-first, it progresses step by step, then comes to asudden change. No clear phenomenon of plateau.

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