Abstract
In a 3 × 3 factorial in which hours of food and water deprivation were varied, Sprague-Dawley rats preferred water to 1.0% saccharin and drank large volumes of it providing hours of water deprivation (thirst), exceeded hours of food deprivation (hunger). All other, i.e. undeprived, equally hungry and thirsty rats, and those whose hunger exceeded thirst preferred 1.0% saccharin but drank small amounts relative to the amounts of water drunk by the thirsty rats. The combined results of this and previous studies employing both choice and single-tube conditions, suggested that thirsty rats drink saccharin primarily for water and to a lesser extent and only with experience, for the sensory stimulation which saccharin provides. Hungry rats drink it primarily for the sensory stimulation. Saccharin in a choice with water seems to provide a means for the determination of the momentarily dominant drive state in naive rats.
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