Thirsty rats, trained to press a lever for distilled water or .15 M solutions of various salts, were tested when neither thirsty nor rewarded. Rats receiving sodium salts (chloride, phosphate, or acetate) during training but sodium depleted during testing pressed 2-3 times more during testing than (a) rats trained with distilled water, calcium chloride, or potassium chloride solutions and were sodium depleted during testing, (b) rats trained with water or with sodium chloride solution but not sodium depleted during testing, or (c) rats trained with sodium chloride solutions and sodium depleted but repleted with sodium prior to testing.

No abstract

No abstract

No abstract

No abstract