Ubiquity of schedule-induced polydipsia.

Baer (1974) watched hungry rats that got food pellets on a fixed-time schedule. Water was always there.

The team wanted to know if the rats would drink too much just because food came on a clock, not because they were thirsty.

Every rat drank a lot right after each pellet. The timing of food, not the food itself, drove the drinking.

The paper says this 'schedule-induced polydipsia' shows up whenever water is present during spaced feeding.

Falk (1966) and Smith (1967) already showed longer gaps between pellets make more drinking. Baer (1974) widens the claim: any gap works.

Nelson et al. (1978) later stretched the gap to 60 s and tripled intake, giving numbers to the 'ubiquity' idea.

O'Leary et al. (1979) moved the effect to humans; people paced rooms on the same kind of token schedule, proving the rule crosses species and behaviors.

If your client paces, chews, or drinks too much during breaks, check the schedule first. Long waits for tokens or bites can create extra behaviors that look like problem behavior but are just adjunctive. Try shorter intervals or give water only after the task to see the change.