1. An assessment of the integrity of the sense of taste by using graded electrical stimuli that is applied to the lingual mucosa or tongue.
2. A measurement which tests the degree of the sense of taste by applying a direct electrical current to various points on the tongue.

An anode or electrode to which a major flow of electrons takes place and that is applied to different points on the protruded tongue and the electric current necessary to produce an acid taste is measured and recorded.