The Psychological Record, 2000, 50,467-492 A PRECURSOR TO THE RELATIONAL EVALUATION PROCEDURE: ANALYZING STIMULUS EQUIVALENCE II

A series of experiments examined the precursor to the relational evaluation procedure (pREP). The pREP is capable of facilitating derived relational responding, but it is less effective than matching-to-sample (MTS) in producing equivalence class formation. Part 1 of the present study tested possible reasons for the inferiority of the. pREP relative to MTS. The first two experiments compared the performances of subjects on two modified versions of the pREP with their performances on a simultaneous MTS procedure. The modifications did not improve performances on the pREP. Experiment 3 compared the pREP with a delayed MTS procedure but again MTS was more effective than the pREP in producing equivalence. Part 2 of the study determined whether pREP equivalence responding could be facilitated by preexposing subjects to a history of MTS training and testing. In Experiment 4, subjects were trained and tested on