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The pREP and contextual cues
for equivalence responding. Veronica Cullinan, Dermot Barnes-Holmes and Paul M. Smeets National University of Ireland and Leiden University, Ireland and The Netherlands The pREP is a novel go/no go procedure which was developed to study stimulus equivalence. Each trial in the pREP involved a sample stimulus and either a positive or negative comparison stimulus being presented successively on a computer screen. Subjects used the computer keyboard to respond to each stimulus pair. Over multiple experiments it was found that the pREP was very effective in producing symmetry but not very effective in producing equivalence responding. However, some exposure to MTS procedures seemed to facilitate equivalence responding on subsequent pREP tests. A series of experiments attempted to identify those features of MTS which might provide contextual cues for eqiuvalence responding. These features were then systematically introduced into the pREP to determine if they would increase its equivalence generating effect. It was demonstrated that introducing cues for relations of "same" and "different" produced an effective pREP. It is suggested that a MTS format may provide such contextual cues for equivalence responding because the format itself has been established pre-experimentally as discriminative for responding in accordance with the relations of sameness and difference. Keywords: pREP, stimulus equivalence, contextual cues |
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