Delayed identity matching to complex samples: teaching students with mental retardation spelling and the prerequisites for equivalence classes.

The team used delayed matching-to-sample with picture-word pairs. Students with intellectual disability saw a picture-word card, waited a few seconds, then had to pick the matching card and spell the word by placing letter tiles.

No one told them how to spell the new words. The delay plus compound pictures made the task harder, forcing them to look at both parts of the card.

Every student learned to spell the new words. They also passed tests for equivalence: if they learned A=B and B=C, they could pick A=C without training.

The spelling and the new relations showed up after only the matching trials. Direct spelling drills were never needed.

Dube et al. (1991) ran almost the same setup but without the delay. Adding the pause in the 1993 study let equivalence emerge, proving the extra wait is the key tweak.

Tenneij et al. (2009) flipped the delay—comparisons came before the sample—and cut errors in half for adults with ID. Together the three papers say: play with delay direction to fit the learner.

Clarke et al. (1998) used compound matching to build vowel and consonant classes. The 1993 paper shows the same method works for whole-word spelling, a conceptual replication with new content.

You can teach spelling and reading relations in one protocol. Run delayed matching with picture-word cards, then test for emergent relations. If the learner passes, you just saved hours of direct spelling drills. Try a three-second delay next session and watch for new untaught responses.