76 



DAVID G. MOULTON 



Filtered air 



ii ii» » i i ii' Hin>»'»ii'»*"» * 



Experimenter visible 



0-5 mV 



0-5 sec 



Fig. 6. Bulbar spike potentials. The odorants were introduced at about the 

 point where the records begin. In the upper trace the animal is undisturbed and 

 apparently relaxed. In the bottom trace the animal is breathing filtered air, 

 the chamber light has been turned off, and the experimenter is visible to the 

 rabbit. Note the fluctuating phases of activation and deactivation in the spike 

 discharges of this last trace. 



.^--•^v..^- 





OIL OF SPEARMINT 



CIGARETTE SMOKE 







,'^%'%\' 



,^' ^vvV 



"^>-v' 





,.--^---v-^^^K..-^''^ 



-v 



OV ,X.y ..^"'\W\'^''' ^^\S 



MINK MUSK 



RABBIT LURE 



a. b, c: olfactory bulb d: ethmoidal nerve 



Fig. 7. Summated responses to odor recorded from three sites in the bulb and 

 one site in the ethmoidal nerve. 



5 sec 



