Abstract
Two experiments investigated the free classification of sets of three stimuli selected from two conceptual hierarchies. In Experiment I, one pair of stimuli was hierarchically related, one pair was categorically related, and one pair was unrelated. The S s usually classified each set into two groups using the hierarchical or categorical relationship. The similarity between stimuli on each relationship influenced which of these relationships was used for classification. In Experiment II, different stimulus sets were used which varied the number of hierarchically related, categorically related, and unrelated stimulus pairs. As in Experiment I, classification was relational, and similarity influenced the choice of relationship. In addition, the relationship between stimuli in different groups affected classification. An explanation based on associative relatedness was not satisfactory.
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