Five basic taste sensations are encoded by sensory receptors in the tongue. It is thought that different combinations of sweet, sour, bitter, salty, and umami sensations are responsible for the perceptions of flavors that we experience. Umami is the most recently discovered primary taste. The taste is best known from the salt of glutamic acid, monosodium glutamate (MSG). You may examine which regions of the tongue are more sensitive to one taste sensation that the others.