ELECTROPHYSIOLOGICAL STUDIES 



199 



For comparison, these alcohol experiments were repeated on the dog's 

 tongue. Figure 7 shows the integrated response from the dog's chorda 

 tympani to increasing concentrations of alcohol followed by a water rinse. 

 From these records it will be seen that there is no positive response until a 

 3 M solution was applied. As will be seen from Fig. 8 the response comes 

 slowly after a relatively long latency. At 5 m concentration the latency is 



0. IM Ethanol 



OfiM 



n. ?M Fth.inol 



*Hfe*itfMi^ttESaa 



0. 5M Ethanol 



m — mnrr; 



0. 7M Ethanol 



1 M Ethanol 



• 



Fig. 7. Integrated responses of the dog's chorda tympani to the application of 

 weak alcohol solutions to the tongue. Note the absence of response to the 

 weak alcohol solutions while water gave weak positive response. Time in 



seconds. 



2M Ethanol 



iM Ethanol 



5M Ethanol 



tttt 



Fig. 8. Integrated responses of dog's chorda tympani to the application of 

 strong alcohol solutions to the tongue. Note the marked depressive effect of 

 the 2 and 3 m solutions before the onset of the slowly rising positive response. 



Time in seconds. 



shorter and the discharge reaches its highest values after about 8 sec and 

 declines quite slowly. A 7 m solution gives a stronger but otherwise very 

 similar response. 



