278 



BRUCE P. HALPERN 



DL- Alanine 



Log Molar Concentration 



60- 



X Glycine 



Fig. 



1 r 



2 I 



Log Molor Concentration 

 3. Chorda tympani median summated response magnitudes following 



chemical stimulation of the anterior tongue of the rat (based on sixteen rats). 

 Ordinate represents magnitude of the summated neural response in arbitrary 

 units, adjusted to 100 units for the response to 0.1 m NaCl. A, responses to 

 NaCl, glycine, DL-alanine, and DL-tryptophan, B, responses to NaCl, glycine 

 (except 3.0 m) alanine (d-, l-, and dl-), DL-valine, and DL-methionine. Ordinate 

 expanded (twice). 



Reproduced from : Halpern, B. P., Bernard, R. A., and Kara, M. R. 1961. 

 Amino acids as gustatory stimuli in the rat. /. Gen. Physiol. 45, 681. 



