“…The stimulus equivalence paradigm may allow study of complex verbal behavior (e.g., Hall & Chase, 1991;Hayes, Barnes-Holmes, & Roche, 2001;Stromer, 2000). Hayes, Barnes-Holmes, and other developers of the relational frame theory (e.g., Hayes, 1991Hayes, , 1994Hayes, Barnes-Holmes, & Roche;Hayes & Hayes, 1989) also sought to study verbal behavior processes (e.g., Barnes-Holmes, Barnes-Holmes, & Cullinan, 2000;Dymond & Barnes, 1995;Hayes, Barnes-Holmes, & Roche;Steel & Hayes, 1991).…”