Effects of electric-shock delivery on schedule-induced water intake: delay of shock, shock intensity, and body-weight loss.

Scientists gave rats food every 60 seconds. Between meals the rats drank lots of water.

The team then added mild electric shocks right after some drinks. They tested three things: wait time (1, 5, 10, or 15 s), shock strength, and how hungry the rats were.

Each rat served as its own control. Sessions ran until drinking stabilized, then shock began.

Shock quickly cut drinking by half. A 1-second delay worked the same as a 15-second delay.

Stronger shocks hurt more, but the drop in drinking stayed flat across delays.

Hungrier rats lost more body weight. The lighter they got, the less shock slowed their drinking.

Lewon et al. (2019) later showed that hunger itself can make mice drink more. Hymowitz (1976) adds pain to the picture: hunger also shields rats from shock’s chilling effect on drinking.

Schneider et al. (1967) found that shock tied to food timing can either raise or lower lever pressing. Here, shock was tied only to drinking, and it always cut drinking. Same species, same tool, different response class.

Lowe et al. (1995) mapped normal water-lever patterns under reward schedules. Hymowitz (1976) shows what happens when an aversive event crashes the party: the neat pattern collapses.

If you use response-cost or mild aversives, know that timing the consequence 1 s or 15 s late changes nothing. Motivation level does matter. A client who is very hungry or very thirsty may shrug off mild punishers that stop a satiated peer. Check MOs first, then adjust the plan.