Schedule-induced drinking: Elicitation, anticipation, or behavioral interaction?

The team placed rats on a fixed-time 60-s food schedule. Every minute a pellet dropped no matter what the rat did.

They watched if the rats drank right after the pellet. They also tried giving food cues or no cues.

Five small tests asked: does the food itself make the rat drink, or is something else going on?

The rats did drink, but not because the food or any cue scared them.

Drinking popped up only when other behaviors like sniffing or rearing were blocked.

The pattern looked like a traffic jam: when one road closed, traffic took another route.

PREMACK et al. (1963) saw the same swap earlier. When they locked the running wheel, rats ate more. When the wheel opened, eating dropped. Both studies show one behavior filling the gap left by another.

Hymowitz (1981) used the same rat-and-pellet set-up but added shock. He also saw licking rise and fall with what else the rat could do, not with the shock cue. The two labs match: adjunctive drinking is about options, not signals.

Hamm et al. (1978) worked with people and got the same picture. When a preferred activity was hard to reach, kids poured time into the next best thing. The idea holds across species: behavior swaps, it does not wait for a trigger.

If you see a client drinking, pacing, or rocking during breaks, do not rush to call it anxiety. Check what responses are blocked or missing. Open a toy, a walk, or a task and watch the "odd" behavior shrink. The drink is not a sign; it is a spare tire.