Water-intake volume regulation in the rat: Schedule-induced drinking compared with water-deprivation-induced drinking.

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Abstract
When drinking-tube apertures were decreased to slow the rate of water ingestion, each of 8 rats spent more time drinking than when larger apertures were used. The mean volumes ingested were not different. These equal volumes were generated by adjustment of each drink duration in accordance with ingestion rate even during the 1st few drinks of the sessions, even when the drinking tubes were frequently switched (every 1-3 min) during the sessions. During drinking induced by water deprivation when food was concurrently available, restriction of the drinking-tube apertures reduced intake volumes by 18%-19%. When food was not concurrently available during water-deprivation-induced drinking, regulation of intake volumes was comparable with that found during schedule-induced polydipsia. These data posed difficulties for theories that ascribe a crucial role to the motor aspects of schedule-induced drinking.

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