p. K. ANOKHIN 



203 



form of facilitating influences both at the moment ot the action oi the 

 external stimulations and, especially, at the moment of the appearance of 

 the orienting-invcstigatory reaction. 



Fig. 8 

 Schematic representation of the constituent 

 processes of the afferent synthesis stage. The 

 scheme shows the constant activating influ- 

 ence of the brain stem reticular formation 

 on the afferent synthesis. It manifests itself 

 during the action of the experimental situ- 

 ation as a whole and durmg the episodic 

 action of the conditioned stimulus. 

 A^, A-. Analysers through which the 

 situation stimuh produce their effect, 

 a^. Collateral action of the same stunuli 

 through the reticular formation. 

 A. Analyser of the conditioned stinuilus. 

 a. Collateral action of the conditioned 

 stimulus throutrh the reticular formation. 



3. PHYSIOLOGICAL MECHANISM.S FORMING THE APPARATUS OF THE ACCEPTOR 



OF ACTION 



In this part of our report we shall describe a new mechanism ot the 

 conditioned reaction noticeci and claborateti in our laboratory. In its 

 physiological essence this mechanism is the end result of the afferent 



