Stimulating effectiveness of cations and anions on chemoreceptors in the frog tongue.

Since,by applying the integrator recording method to the quantitative study of the taste receptors of rat's tongue,BEIDLER(1953)confirmed that cations appear to have the greater effectiveness than anions for stimulating the chemoreceptors,the similar experiments have been carried out on several other animals by a number of investigators(BEIDLER,FISHMAN and HARDIMAN, 1955;FISHMAN,1957;TATEDA,1961).On the other hand,KUSANO and SATO (1958)and KUSANO(1958 ; 1960)have measured the effectiveness of cations and anions of salts on frog's tongue by determining the threshold concentration or by recording impulses in single taste nerve fibers. The present study was undertaken to evaluate the stimulating effectiveness of cations and anions on the frog's tongue by recording the integrated response of the glossopharyngeal nerve and to compare it with the results mentioned above.