Abstract
This study was designed to measure if (1) is copula and auxiliary are referents of the same response class, (2) are copula and auxiliary are referents of the same response class, and (3) singular is and plural are are referents of independent response classes. These questions were answered through a multiple baseline design. Analysis showed response-class learning between is copula and auxiliary and between are copula and auxiliary. Previous studies have indicated a functional relatonship only between is copula and auxiliary. Past studies have not clearly shown response-class learning since the baseline without reinforcement was not recaptured.
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