STRESS-INDUCED BREAKDOWN OF AN APPETITIVE DISCRIMINATION.

WINOGRAD (1965) tested what happens when an animal must take an unavoidable shock right after a signal that used to mean food. The shock came at the end of the third light in a chain. The animal had already learned which light meant 'peck for food' and which meant 'do nothing'. The team then watched if the bird could still tell the lights apart.

The work was done in a lab with single-case methods. No people or clinical clients were involved.

The birds started pecking during the 'do nothing' light. The shock broke the clear line between the lights. Errors went up. The breakdown lasted longer than simple punishment suppression. When the shock stopped, the birds slowly got the discrimination back.

Shahan et al. (2023) revisited this idea with a newer design. They found the drop in responding was not a true loss of stimulus control. The shock simply scared the birds into stopping. Their mixed data now supersede the 1965 'breakdown' story.

HOFFMAN et al. (1963) showed that conditioned suppression can live for years. WINOGRAD (1965) asked what might wreck that long-term control. Together they map both the staying power and the weak points of aversive stimuli.

Fyfe et al. (2007) flipped the script in humans with ID. They used a punishment cue on purpose. The cue cut stereotypy to near zero. Where E saw breakdown, they built helpful control.

If you use punishment or extinction, know that extra aversive events can muddy your stimulus control. A single 'bad thing' tied to a cue can make clients respond to the wrong signal. Check for hidden aversives in your session flow. If behavior falls apart after a new punisher, pause and re-train the discrimination instead of pressing on.