Salty, bitter, sweet and sour survive unscathed

Abstract

Types of sensory receptor can only be identified by multidimensional discrimination of a familiar version of a sensed object from variants that fdisconfound putative types. By that criterion, there is as yet no evidence against just the four classic types of gustatory receptor, for sodium salts, alkaloids, sugars, and proton donors. © 2008 Cambridge University Press.