Serial discrimination-reversal learning with and without errors by the California sea lion.

One sea lion learned three form-discrimination reversals.

First the animal picked the larger black circle for fish.

Then the rule flipped: now the smaller circle paid off.

Trainers faded the size difference a tiny bit each trial.

They also drilled the moment the lion’s head turned toward the new target.

With fading plus timed drill, the lion made almost zero errors.

Without fading, the same lion kept picking the old stimulus and piled up mistakes.

Shimizu et al. (2006) later used the same three-stage prompt fade to teach mouse-pointing to preschoolers with delays.

Zigler et al. (1989) moved the logic to a psych ward, using graduated prompts to rebuild conversation in adults with chronic schizophrenia.

Neuringer et al. (1968) ran a rat study that looked opposite: brief timeouts cut errors, not stimulus fading.

The rat paper shows another error-reduction tool; together they give you two levers—fade cues or add brief timeouts—depending on the task.

You can stop reversal errors before they start.

Fade the cue the learner already likes, then hammer the instant of attention shift.

Try it when students get stuck on old S+ pictures, coin values, or yes/no rules.

One or two trials at the flip point beats twenty error corrections later.