100 



BRAIN MECHANISMS AND LEARNING 



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Fig. 3 



An alimentary conditioned reflex to an electric current. A dog to which an electric current 

 and the presentation of food were applied in the stereotyped sequence 'electric current — 

 food'. (<i) A conditioned salivary alimentary reflex to the application of electric current 

 (direct connection) ; (/)) movements of the leg during the presentation of the food receptacle 

 (reverse connection). 



From top to bottom: i. — mcchanogram of movement of the left foreleg; 2. — mechanogram 

 of masticating movements; 3. — salivation in drops; 4. — mark of electro-cutaneous stimula- 

 tion; 5. — mark of presentation of the food receptacle; 6. — time in seconds. 



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Fig. 4 



Electro-defensive motor reflex to presentation of food. A dog to which presentation of food 

 and electrical current were applied in the stereotyped sequence 'food — electric current'. 

 ((7) A conditioned motor defensive reflex to the end of the act of eating (direct connection); 

 (/)) a conditioned alimentary reaction to the electric current (reverse connection). 



From top to bottom: i. — mechanogram of movements of the left foreleg; 2. — mechanogram 

 of movements of the right foreleg; 3. — mechanogram of masticating movements; 4. — saliva- 

 tion in drops; 5. — mark of electro-cutaneous stimulation; 6. — mark of presentation of the 

 food receptacle; 7. — time in seconds. 



