Synopsis
Using the pupillary reaction adopted in the autonomic function test as an index, we have investigated autonomic reactions to taste stimuli and clarified that the sympathetic nerve activity increases as the bitter substance concentration increases. Thus, to make the relation between a reaction of the nano level to the taste stimulus and a recognition threshold clear. we investigated autonomic reactions to a low-concentration stimulus at a bitter taste recognition threshold level. It was suggested that a non-sensible stimulus at a concentration lower than the bitter taste recognition threshold has a certain influence on the autonomic nerve.
Key words: Pupil response, Autonomic nervous function, Taste stimulation
