Abstract
One hundred and thirty-five rats were maintained and tested on irregular feeding or drinking schedules so that food and water consumption could be assessed as a function of the time of day of testing, hours deprivation, and deprivation experience, without the usual experimental confounding among these variables. For hungry and thirsty Ss tested in their home-cases in Experiment 1, drinking increased with deprivation time at least up to 42 hr., whereas eating changed very little between 7 and 42-hr. deprivation. In Experiment 2, hungry Ss tested in a bar-press situation showed maximum intake at 24-32 hr. deprivation. The relatively slight effect of deprivation time is attributed to the predominating importance of weight loss.

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