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Comparing delayed matching to sample with three variations of the training-IRAP for establishing derived relations
Marcello Henrique Silvestre1,2, Colin Harte1,2,3, Denise Aparecida Passarelli1,2,4
1Universidade Federal de São Carlos, São Carlos, Brazil.
Journal of the Experimental Analysis of Behavior
|January 8, 2026
Summary
The modified training-IRAP procedure demonstrated superior effectiveness in fostering derived relations compared to delayed matching-to-sample (DMTS). This enhanced training method shows promise for improving relational learning outcomes.
Area of Science:
- Behavioral Psychology
- Cognitive Science
- Learning Sciences
Background:
- Matching-to-sample (MTS) is a common method for studying derived relations.
- Standard MTS training may limit the emergence of novel relations.
- The training-implicit relational assessment procedure (training-IRAP) offers a potential alternative.
Purpose of the Study:
- To compare the effectiveness of delayed MTS(2s) and training-IRAP procedures on participant yield in establishing derived relations.
- To compare the mean number of training blocks required for each procedure.
- To evaluate modified training-IRAP procedures against standard versions and DMTS(2s).
Main Methods:
- A between-subjects design with 68 typically developing students.
- Comparison of delayed MTS(2s), standard training-IRAP, modified training-IRAP, and delayed modified training-IRAP(2s).
- Abstract stimuli were used, and yield was analyzed at multiple performance thresholds (91.67%, 83.33%, 79%) with a baseline maintenance criterion of 87.5%.
Main Results:
- Modified training-IRAP procedures yielded significantly higher participant success rates across all analysis levels.
- Delayed MTS(2s) followed the modified training-IRAP, with the standard training-IRAP showing the lowest yield.
- The delayed MTS(2s) and delayed modified training-IRAP(2s) groups required the fewest training blocks.
Conclusions:
- Modified training-IRAP procedures are more effective than DMTS(2s) for establishing derived relations.
- The findings suggest modifications to training-IRAP enhance its utility.
- Implications for improving precision, scope, and depth in conceptual, experimental, and applied relational learning research are discussed.

