Cullinan, V., Barnes-Holmes, D., & Smeets, P. M. (2001). A precursor to the relational evaluation procedure: The search for the contextual cues that control equivalence responding. Journal of the Experimental Analysis of Behavior, 76, 339-349.
The precursor to the relational evaluation procedure (pREP) is a go/no-go successive discrimination procedure for examining stimulus equivalence. Previous research has shown that it does not readily produce equivalence responding unless some matching-to-sample (MTS) procedures are incorporated into the experimental sequence. Two experiments attempted to identify contextual cues that would generate equivalence responding on the pREP. The findings suggest that the relations of same and different may be fundamental to equivalence responding. These findings are discussed in terms of what they suggest about the nature of the equivalence phenomenon specifically and derived relational responding more generally.