Some variables affecting rate of key pecking during response-independent procedures (autoshaping).

The team worked with pigeons in a small lab. They wanted to see what makes a bird peck a key when food comes no matter what.

They changed how long the key stayed lit, how often food followed, and how long the bird waited between trials. They also tried different key colors and shapes.

Pecking went up or down when the timing or food odds changed. Color and shape of the key made no difference.

In short, time and probability rule autoshaped pecking; looks do not.

Quilitch et al. (1973) showed that pairing the key light with food is what drives the peck, not the bird’s own action. Hayes et al. (1975) now list the exact knobs you can turn to speed or slow that peck.

Lea et al. (1977) seemed to clash: they found color matters if the key matches the feeder hue. The two studies differ. C held color constant while changing time; E held time constant while changing color. Both are true: color can jump-start learning, but once pecking runs, timing still controls the rate.

Tager-Flusberg (1981) carried the idea further, splitting respondent pecks from operant ones. Together these papers map how autoshaped behavior starts, speeds up, and gets steered by different cues.

If you run stimulus-stimulus pairing programs with learners who have limited verbal skills, think about timing first. Keep the teaching stimulus on for the same brief period each trial and deliver the reinforcer at steady odds. Worry less about the picture’s color or shape. Try a fixed brief interval—say two seconds—and a rich schedule at first. You should see faster acquisition of new responses without extra shaping.