Internal stimuli and learning.

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Abstract
Six male albino rats were trained in a brightness discrimination box to go to the light side for food and to the dark side for water. They were made hungry or thirsty in a random order. By 732 water-deficient trials and 614 food-deficient trials the animals were making correct choices well above chance levels. They were then run while both hungry and thirsty; under this condition 100% of choices were to the food side. When run satiated, 92% of choices were towards water. Finally, after 48 hours without food or water, 51 cc. of water was introduced by tube into the stomachs of 4 animals. Choices were 100% to the water side. The writer concludes that the animals were responding to "stimuli from a full versus a partially full stomach." The significance of these findings for interpretation of the Hull-Leeper experiments is discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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