LOCALIZATION OF LEARNING PROCESS 219 



phasic and a tonic influence upon lower behavior pat- 

 terns, with the latter predominant. In higher mam- 

 mals, especially in man, some of the tonic influences 

 are taken over by non-cortical mechanisms and the 

 great enlargement of associational tissue is correlated 

 with corresponding increase in the amount, complexity, 

 and directive control of the phasic influences. Inten- 

 tional control of behavior and the solution of problems 

 of conduct by what is commonly called "insight" are 

 dependent upon the efficiency of these highly specific 

 and yet very plastic intrinsic functions of the associa- 

 tional cortex. We shall next inquire somewhat further 

 into the nature of these processes and their organs. 



