Abstract
After a 30-day period during which 5 groups of rats were given differing cyclic-deprivation treatments, all Ss received either 23-hr. cyclic-food or 23-hr. cyclic-water deprivation for 3 days. Under food deprivation, both kind and recency of prior deprivation influenced ingestion; a history of food deprivation led to greater eating and food or water deprivation, if recent, let to greater drinking. Under water deprivation, only recent food or water deprivation led to greater eating and drinking. All Ss regulated their intake so as to maintain a fairly constant ratio of food to food-plus-water under any given maintenance schedule.