194 H. DIAMANT AND OTHERS 



middle ear operation. The operations were performed in the ear chnic of 

 Karolinska Sjukhuset in an electrically screened operating room ; the 

 50 c/s power supply to this room was switched off during recording. The 

 patient was earthed by applying a metal net collar around the neck as well 

 as a metal cuff to the arm used for intravenous injections and for blood 



Touch , 



0.5M NaCl 



Dist. water ■v--v.'-~'^ ...^.^^^ 



1 5% Sucrose 



0.04% Saccharine 



0.02M Quinine 



0.2M Acetic acid 



/ 



Fig. 1. Integrated electrical responses of the whole chorda tympani of man to 



sapid solutions poured on the tongue. Note that water depressed the 



spontaneous afferent activity. Time in seconds. 



pressure measurements. The experiments were performed under deep 

 anaesthesia (Fluothan) and in some cases the patient was curarized in 

 order to avoid movements of the electrodes. 

 After an incision in the meatus, the ear drum was pushed aside giving 



