Written lists as mediating stimuli in the matching-to-sample performances of individuals with mental retardation.

Researchers asked adults with intellectual disability to play a delayed matching game. First they saw six pictures. After a short wait they had to pick the same pictures from a larger set.

Half the time the adults wrote the picture names on a card that stayed in view. The other half they worked from memory. The team tracked how many choices were correct.

When the written list stayed on the table, accuracy jumped to almost perfect. Without the list, scores stayed low.

The learners only used the list on the hard six-picture trials. On easier sets they skipped writing and still did well.

Smith et al. (1994) and Rasing et al. (1992) showed the same boost with experimenter-made task lists. The new twist here is the learners created the list themselves, a self-management step that did not need extra training.

A similar delayed-matching design appears in Mann et al. (1971), but with monkeys and brightness cues instead of written words. Both studies confirm that visible cues rescue performance when memory alone fails.

McLean et al. (1983) used picture prompts for vocational tasks and also saw gains. The pattern across papers is clear: any visible prompt, whether pictures, written steps, or self-made lists, helps people with ID succeed on visual tasks.

You can add a blank index card to your next matching or sorting task. Tell the learner, "Write down what you see so you don’t forget." No extra prep, no special materials, yet it turns a frustrating memory game into an easy win. The skill transfers: once they see the card helps, they choose to use it when problems get hard.