280 BRUCE p. HALPERN 



NaCl vs. sugars and to Beidler's (1953) comparison of responses to NaCl 

 vs. CaCl^ or MgCls- 



The temporal characteristics of multiunit summated gustatory responses 

 to stimulation of the anterior portion of the tongue of the rat with NaCl, 



iiiiitiiiiiniiiiiiiiiiiiiiiiiM 



HjO « 



o.m Noci C 







iri miititii 



.SM €tyctM C 



CoftJtouofiOB of E F 



G 



Chordo Tympenl .,>^il5^;. 



Fig. 5. Oscillograph records of electrical activity in the entire chorda tympani 

 nerve of one rat following chemical stimulation of the anterior portion of the 

 tongue. The signal lines at the tops of the records indicates the approximate 

 duration of stimulus flow over the tongue. The signal lines have been retouched. 

 (A) Resting. No liquid flow, (B) H.,0, (C) 0.1 m NaCl, (D) Continuation of C, 

 8.2 sec later. The signal line indicates a distilled water wash, (E) 1.5 m glycine, 

 (F) Continuation of E, (G) Continuation of F, 19.7 sec later. The signal line 

 indicates a distilled water wash. (H) 1.2 m DL-alanine, (I) Continuation of H, 

 24.7 sec later. The signal line indicates a distilled water wash. Stimulating and 

 recording conditions as in Fig. 4. Records read from right to left. 



glycine, and alanine have been considered. The temporal pattern of a res- 

 ponse recorded from the chorda tympani varies with the concentration, 

 the empirical, and the structural formula of the stimulating chemical. 

 These data suggest that changes over time in the magnitude of gustatory 

 responses may be of some importance in chemical coding in taste. 



