ELECTRICAL ACTIVITY IN THE OLFACTORY SYSTEM 



81 



discharge. In the case of heptane, there is a secondary peak whose height 

 relative to the initial peak varies for different placements. 



LB1 





B2 



jL. 



\UJ^ v^^ 



^1 



.\h^-^^^^ U\^'1^V Uw'V^'^^^'^' U LB3 



_^ilJL/._Ajl_AJUVi H. 



LB4 



RBI 



\J >./ \^^^y 



^ U'' RB2 



W^-nw^wM.*-^«-^.«vA«v R B 3 



--A^J vvs^As---J ' 



BENZENE 



HEP 



;\wt^>^ 



s,f^- 



TANE 



2-Btji 



ITANONE AMYL E 

 ALCOHOL 

 CONTROL (alternate responses): AMY L ACETATE 



u.^ 



■JU 



PN 



ENOL 



1 min. 



Fig. 11. Integrator records for responses to different odorants in a rabbit with 

 a unilateral transection of the anterior olfactory areas. Symbols are as in Fig. 9. 

 The same concentration of amyl acetate was presented before and after each 

 test of a different odorant (intervals of at least 5 min between successive stimuli). 



A further point illustrated by Fig. 11 relates to the control stimulus, 

 amyl acetate. Although there is a relatively high consistency in the amplitude 

 of the responses, especially when averages are compared, it is clear that 

 the relative effectiveness of this odorant at different sites is not always 

 constant. 



