Galvanic Tongue Stimulation is the technology which can enhances the taste sensation. Our previous study has already demonstrated that repetitive square current stimulation enhances salty and umami taste induced by NaCl and glutamic sodium water solution during stimulation. However, it is not clear whether the repetitive square current stimulation is effective or not in other three basic taste i.e., sweetness, sourness, and bitterness. The aim of this paper is to demonstrate that repetitive square current stimulation enhances all five basic tastes induced by electrolyte water solutions with psychological method adhering to our previous works.
