Some effects of the conditioned suppression paradigm on operant discrimination performance.

Rats pressed a lever for food while colored lights told them when food was available.

Sometimes a buzzer sounded and a brief electric shock followed. The team watched how the shock changed pressing during the food light, the no-food light, and the buzzer itself.

Three small experiments tested if the fear would stay inside the buzzer period or spill over into the whole discrimination.

Shock fear leaked everywhere. Pressing dropped during both the food light and the no-food light, not just when the buzzer was on.

One experiment even showed a tiny rise in pressing, but the main picture was clear: the suppression spread across the entire schedule.

The results did not copy an earlier claim that shock raises responding during the no-food signal.

Schneider et al. (1967) set the stage. They showed that shock timed with food makes rats press more, while shock paired with no food makes them stop. The 1968 study moves the same idea into a three-signal discrimination and finds the stop effect wins.

Hymowitz et al. (1974) and Hymowitz (1976) took the idea further. They proved that only shock the rat cannot escape cuts schedule-induced drinking. Together these papers draw the line: punishment suppresses most when it is outside the animal’s control.

Duker et al. (1996) flipped the question. Instead of shock they used pleasant Pavlovian cues and measured how hard it was to disrupt pressing. Visual cues won, showing that stimulus modality matters when you want strength or weakness in behavior.

Your client may not get shocks, but punishment and fear still roam the room. A stern “no,” a removed iPad, or a sudden loud clang can suppress more than the target response. Check if the drop spreads to useful behaviors like manding or eye contact. If it does, thin the aversive stimulus or pair it with clear relief cues so the fear stays boxed to the exact context you want.