Cross-enhancement of the sour taste on single human taste papillae

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In 10 experiments, sucrose and citric acid solutions were placed on single papillae of 4 trained adult Ss, who identified the stimuli and rated their intensity. It was found that sucrose can enhance the intensity of an acid taste on a single papilla. Neither water taste nor sweet taste system activation played any role in the mediation of this enhancement. In the single papilla, suppression of the acid taste when in mixture with sucrose could occur without sweet system activity. It is concluded that sugars, through their capacity to bind protons, act to reduce the availability of protons to the acid receptors. (40 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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