Abstract
Using salt induction of thirst in rats, an experiment was conducted to explore Malmo's activation theory. The effects of various sodium chloride concentrations on bar pressing, water intake, and heart rate were studied. The behavioral data supported the position that the relationship between drive and performance is represented best by a quadratic function. Heart rate fell in a direction opposite to that predicted by activation theory. A number of possible explanations of the decrease in heart rate were entertained. It was concluded that heart rate is either not always a good peripheral measure of activation or that the theory cannot adequately account for heart rate changes with salt-induced thirst.
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