Abstract
Can rats which have never been selectively satiated by food or water respond appropriately by choosing the relevant reward when they are made hungry or thirsty ? A group of 21 rats was put on a diet of wet mash and trained both hungry and thirsty in a T-maze with water on one side and food on the other. 8 out of 10 of the animals which were made thirsty on the test-run chose correctly in spite of an established preference for the other reward. Only 1 out of the 11 animals made hungry chose correctly. Possible explanations of this result are examined.