Studies on sugar preference: I. The preference for glucose solutions and its modification by injections of insulin.

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Abstract
"Rats were given a choice between a 10% glucose solution and a 35% solution. The 10% solution was preferred. Glucose, water, and taste were evaluated as possible rein-forcers. Glucose and water were eliminated, leaving taste. When insulin was administered, the preference shifted to the 35% solution. Glucose was shown to be the reinforcer." Learning and homeostatic mechanisms are discussed.

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