A choice technique to assess the effects of selective punishment on fixed-ratio performance.

The team worked with rats that pressed levers on fixed-ratio schedules.

Each rat had two levers. One lever needed ten presses for food. The other needed twenty.

The rats quickly chose the ten-press lever most of the time.

Then the scientists added mild electric shock to that preferred lever. They watched choice flip in real time.

Shock on the favorite lever cut its use right away.

Higher shock made the switch happen faster.

Hunger level and a calming drug also changed how fast the rats moved to the safer lever.

The result shows punishment can reverse choice when the alternative still pays off.

DARDANO et al. (1964) first showed that timing of shock inside one ratio matters. The new study moves the question to a choice set-up and still sees clean suppression.

Rachlin (1972) later let pigeons dial their own shock level. The 1970 data set the stage by proving shock intensity is a key dial.

Erickson et al. (2016) copied the choice idea with children with autism and mild words instead of shock. Some kids shifted choice like the rats; others did not. The animal rule holds, but individual tests are still needed.

You now have lab proof that punishment can flip choice if a safe reinforcer waits next to it.

Before adding any aversive procedure, map the alternative reinforced response. Make that path easy and valuable. Then monitor whether the learner actually switches or stalls. If the only other option is hard or thin, punishment will look like it "doesn\'t work" while the real problem is the lean schedule next door.