"This study has investigated the categorization and verbalization processes of 24 adolescents, 8 of whom were profoundly deaf. The remaining subjects comprised 2 hearing groups, one group matched with the deaf subjects on age and IQ and the other group matched on Stanford Achievement and IQ. The Goldstein-Scheerer Object Sorting Test was administered and the deaf subjects were separately compared with each of the 2 control groups." It is concluded that deaf Ss "categorize, on this task, as adequately as the hearing subjects. They . . . have more inadequate verbalizations than hearing subjects and more adequate categorizations accompanied by inadequate verbalizations than hearing subjects matched on age and IQ . . . . [They] do not differ from hearing subjects in the type of verbalization or in the developmental level of the verbalizations used, or in their spontaneous changes of categorization throughout the test . . . . [They] have narrower categories than hearing adolescents of their own age and IQ though they do not differ from hearing subjects of the same achievement and IQ."

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