R. HERNANDEZ-PEON AND II. BRUST-CARMONA 4O5 



6 months before (Fig. 8). But in contrast with the intact annnals, these 

 cats did not seem to recognize the fish-clanip nor could they reach the 

 food easily. 



Conditioned flexor response in decorticate cats. In decorticate cats the 

 flexor response was readily conditioned to the buzzer. Usually the 



ALiMENTARY 



REFLEX FLEXOR REFLEX 



BEFORE 

 CONDITIONING 







CONDITIONED 



AFTER LESION 

 IN R.F. 



mM 





BUZZfeR , , 



ELECTRIC SHOCK 



Fig. 8 

 Conditioned alimentary and flexor responses in a cat with the neocortex bilaterally removed. 

 Then a lesion was made in the mesencephalic reticular formation and both kinds of responses 

 disappeared. 



number of associations required tor establishing the conditioned response 

 was not greater than in the intact cats. 



Effects of mesencephalic lesions on the conditioned alimentary and flexor 

 responses. Once the conditioned alimentary and flexor responses had been 

 established, electrolytic lesions were made in the posterior part of the 

 mesencephalic reticular formation (plane A-2 of the stereotaxic maps of 

 the cat's brain). Usually the lesion did not yield unconsciousness, and the 



