“…The introduction of delays during training and testing was done in order to test for generalized listener behavior and naming in a way which more closely resembles natural learning conditions, where infants are asked for objects whose names were presented some time ago. The MET was similar to that used in other studies to establish generalized response classes, for example, imitation (Baer, Peterson, & Sherman, 1967), attention (Luciano & Polaino-Lorente, 1986;McIlvane, Dube, & Callahan, 1996), say-do correspondence (Luciano, Barnes-Holmes, & Barnes-Holmes, 2002;Luciano, Herruzo, & Barnes-Holmes, 2001), and arbitrary relational responding (Barnes-Holmes, Barnes-Holmes, Smeets, Strand, & Friman, 2004).…”