TEMPERATURE CHANGE ON THE RESPONSE OF TASTE RECEPTORS 153 



of varying temperatures consists of two kinds of responses, one to 

 temperature change of the tongue and the other to taste stimuU, we have 

 carried out further experiments, in which not only temperature but also 

 concentration of taste solutions were changed. The results obtained for 

 NaCl, quinine and HCl are shown in Figs. 4, 5 and 6, and they reveal more 



lO'C 



SO'C 



4 0''C 



Ringer 



!i npi ii p{;pifaii|ini|H ' 



Isec 



Fig. 1. Integrated response of the chorda tympani to stimulation of the tongue 

 with Ringer's solution, water and NaCl solutions of varying temperatures. 

 Numerals at the top of the figure indicate temperature of solutions, and the 

 bottom records show changes in the surface temperature of the tongue. From 

 Nagaki, Sato and Yamashita, unpublished. 



or less similar features. When the concentration is low, the response is 

 minimal at 30 C and is increased with an increase or decrease in the tem- 

 perature. However, with increasing concentration the response magnitude 

 at 30°C increases more than the increase at the temperature below or above 

 30"C, and therefore the magnitude of the response to solutions of high 

 concentration does not change very much with a change in temperature. 

 As shown in the righthand figure of Figs. 4, 5 and 6, the increase in the 



