Differential sample response schedules in the acquisition of conditional discriminations by pigeons.

The team worked with pigeons on a matching-to-sample task.

Birds had to peck a sample key, then pick the matching comparison key.

Some birds faced different peck requirements on each sample. Others faced the same requirement every time.

Pigeons learned the match faster when each sample needed a different number of pecks.

Same-requirement birds took longer to reach accurate choices.

Different response rules made the samples easier to tell apart.

Dougherty et al. (1994) got the same boost by giving different reinforcer lengths instead of different peck counts. Both tricks make the outcomes of each sample stand out.

Johnson et al. (1994) later moved the idea to humans with intellectual disability. Having learners say the sample name out loud helped them succeed after earlier failures.

Lydersen et al. (1974) had already shown that any response-produced cue helps. The 1976 study sharpened that idea by proving timing of the cue matters more than just having one.

You can speed up conditional discrimination by letting the learner do something different for each sample. Ask a child to clap three times for red and once for blue before picking the match. The unique action tags the sample, so the right choice gets obvious faster. Try it next session with any matching task that has stalled.