25: 



BRAINS OF RATS AND MEN 



the bell through the senses of touch, hearing, and 

 sight may result in a cortical set of such a character 

 that the activation of any one of these sense organs 



somesthetic 

 field 



ouditorq 

 ffeld 



Fig. 51. — Diagram of the relations of projection centers and primi- 

 tive associational fields in a lower mammal, illustrating the courses of 

 intracortical nervous impulses in reactions to a bell felt, heard, and seen. 

 The projection centers {Ay By C) are shaded. The primitive associational 

 fields (unshaded) in reality overlap the projection centers and also one 

 another. Feeling, hearing, and seeing as psychological processes are not 

 to be thought of as separately localized in the associational fields indi- 

 cated, but each of these fields includes a complex physiological process in 

 which the designated sensory excitations are predominant. 



by the object may call forth a reaction in which all 

 of the other sensory components are represented in 

 memory. The probability is that the response in each 

 case will be to the total situation as presented at the 

 moment in sensory stimulation and memory revivals. 



