ELECTRICAL ACTIVITY IN THE OLFACTORY SYSTEM 



73 



At some peripheral sites, however, responses were more specifically 

 related to odor stimulation, and examples of these — one from non-olfactory 



o 



z 



tn 5 



III Percentage change 

 ill in heart beaf 



Nasal mucosa 



I QBulb 



§ QBulb 



= O.Bulb 



$<=$,- 



^ 



jm 



PYR I D I NE 



MINK MUSK 



RABBIT lUfiE 



Fig. 1 . Bar graph of interrelations between summated discharges recorded from 

 peripheral and 3 bulbar leads, and changes in the rate of heart beat (declines in 

 rate are positive). Although shock and most novel stimuli evoked declines of up 

 to 27 per cent in heart beat and increased activity recorded from certain peripheral 

 sites, mink musk had the reverse effect. Heart beat values relate to a 30 sec period 

 before, and one after stimulus presentation. 



f I Itered air 



amyl acetate 



50mV 



25m.sec 



Fig. 2. Pattern of neural discharge recorded from electrodes chronically im- 

 planted in a region of non-olfactory nasal mucosa. 



mucosa, the other from the region of the cribriform plate — are shown in 

 Figs. 2, 3 and 4. At both sites, the activity consists of asynchronous trains 

 reaching 50/(V in amplitude with individual deflections up to 5 msec in 



