Generalizability of heart rate as a measure of drive state.

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Abstract
Heart and bar-pressing rates were recorded for 2 groups of 23-hr. deprived rates by Ss pressing the weighted bar are explained by relationships between requiring 15- or 60-g pressure. Test trials at deprivations from 12-96 hr. (steps of 12 hr.) showed increments in mean heart rate and inverted U performance function previously obtained. Consistently higher performance rates by Ss pressing the weighted bar are explained by relationships between arousal and performance; absence of differences in heart rate indicates that physical activity has little effect on heart rate. In another study, rate of bar pressing increased significantly with changing levels of NaCl induced thirst but heart rate showed no consistent change; neither measure varied significantly with bar pressure.

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