Abstract
Properties of single units of gustatory receptors in the frog tongue were investigated by recording the impulse discharge of single glossopharyngeal nerve fibres to various taste solutions.1. The great majority of the units observed in the present experiment responded to more than one kind of taste solution (94 units among 105), but the units responding to all taste stimuli employed were only 3 cases found. The specific units responding to a particular taste solution were observed in 11 examples; 5 units to 1/256 M quinine hydrochloride, 2 units to 1/64 N acetic acid, 3 units to distilled water and 1 unit to 1/4 M saccharin sodium. Receptor-units were divided into four main types.2. The D-units responded to divalent salts and in most cases they also responded to distilled water and to sucrose dissolved in water or in Ringer. Sometimes, they responded also to monovalent salts, quinine and acetic acid. This type occupied the great majority of the receptor-units observed in the present experiments (67 units among 105).3. The M-units responded mainly to monovalent salts such as NaCl, KCl and LiCl, but not to other kinds of taste solutions (8 units among 105).4. The Q-units and A-units responded to quinine and acetic acid respectively (9 and 7 units among 105).5. No receptor-units which specifically responded to sucrose were found; but the units responding to sucrose belonged to the D-units.
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