The relative acceptability of sodium chloride solutions as a function of concentration and water need.

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Abstract
Non-thirsty rats tested for NaCl solution concentration preferences with the brief-exposure method, showed peak preference within the range 0.75%-1.5%; with concentrations weaker than this optimal range, rats showed preference for the more concentrated, and with samples more concentrated than the optimal range, they showed preference for the lower concentration. In line with these findings a gradient of acceptance and one of rejection are defined, and optimal acceptability is defined by the intersection of these two gradients. Thirsty rats showed preferences for water or for the weaker of NaCl solution pairs. They are also more variable in their preference patterns.

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