Punishment and recovery during fixed-ratio performance.

AZRIN (1959) worked with pigeons that pecked a key for food.

The birds earned every bit of food after a set number of pecks. This is called a fixed-ratio schedule.

The team then added mild electric shock at different points in the ratio to see how punishment changed the birds’ steady burst-and-pause pattern.

Punishment broke the normal break-and-run rhythm.

Birds still finished the ratio, but the usual long pause after food shrank or split. The smooth high-speed pecking that normally followed also stuttered.

DARDANO et al. (1964) repeated the idea five years later. They shocked only the first, middle, or last response in the ratio. Pauses grew when the first peck was punished. Later-peck shocks hurt the middle or end of the run. Together, the two papers show timing matters.

Winkler (1970) extended the work to choice. Rats could pick one of two fixed-ratio keys. Shocking one side quickly flipped their preference, proving punishment suppresses ratio work in a competitive setup.

Halpern et al. (1966) mapped the normal pause: bigger ratios make birds wait longer before they start. AZRIN (1959) shows punishment can override that rule, either erasing or stretching the pause depending on where the shock lands.

If a client stalls or rushes after earning a reinforcer, check what follows that response. A mild aversive—even social—placed at the wrong moment can chop the smooth momentum you want. Use the lesson to time error-correction, tokens, or brief response-cost so they land where they help, not where they break the run.