78 



DAVID G. MOULTON 



of the transection, spike discharges in response to odor stimulation stand 

 out clearly against the low amplitude background activity and they sum- 



7 



'tm w iw w i mwuM W w 



w 





200hV 

 [2OOHV 



Oil of carrot se«d 



(i) 

 Pyr i d ine 



1 sec 



50mV 



200mV 



(ii) 



1 sec 



Fig. 8 (i) and (ii). Waves (a) and spike (b) discharges in response to odorants in 

 the bulbs of a rabbit with unilaterally transected anterior olfactory areas. Each 

 set of four traces (1 and 2) was recorded simultaneously. 1, Side of lesion. 

 2, Opposite side. In (i) the animal was unanaesthetized and the odorants were 

 introduced at about the point indicated by the arrow. In (ii) the animal was 

 under light nembutal anaesthesia and the odorant was introduced about 50 sec 

 previously for 10 sec, but elicited no immediate response. Note that the train of 

 waves is unaccompanied by any marked change in spike activity in either bulb. 

 Within a bulb the same pair of electrodes was used to record both the spikes and 

 the waves, the activity being led through 2 band pass filters at different settings. 



mated strongly. On the opposite side, responses are largely embedded in 

 the high amplitude resting discharge, as in the rabbits with intact efferent 



