Effects on deprivation and reinforcement-magnitude of response variability.

CARLTON (1962) worked with pigeons that pecked a key for food.

The birds were either a little hungry or very hungry.

The food they earned was either a small snack or a big meal.

The team watched how these changes shaped the birds’ pecking patterns.

Small snacks and mild hunger made the birds peck in new ways.

They switched timing, force, and location more often.

Big meals and strong hunger locked the birds into one rigid pattern.

Low deprivation plus small reinforcers equals more response variability.

Allison (1993) later reframed the same idea.

He said reinforcement is not about food size; it is about how much the bird is kept from the activity it wants.

Hastings et al. (2001) took it further and called mild deprivation an “establishing operation.”

They showed that restricting a preferred activity gives that activity its power to reinforce.

Selekman (1973) added a warning: if your stimulus control is weak, mild deprivation can also bring back old, unwanted responses during extinction.

Together these papers tell us to watch both deprivation level and stimulus clarity when we shape new behavior.

You can use tiny reinforcers and short work sessions to keep learners flexible.

This is perfect when you want novel solutions during problem-solving or creative play.

Just pair the thin reinforcers with clear cues so old errors do not pop back up.