One-drop licking in rats

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In 2 experiments, rats licked single drops of fluid from the end of a drinking tube, and the number of licks in the single burst was measured. The size of the burst increased markedly as the single drop increased in volume and it increased slightly with progressively severe thirst. However, burst size did not change across a range of sucrose and sodium chloride concentrations normally preferred by rats. The data suggest that licks within a burst are triggered largely by tactile stimulation of the tongue. Licking during the course of bursts under normal drinking conditions has the properties of a phasic elicited reflex. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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