CHAPTER XIII 

 THE ASSOCIATION CENTERS 



Intelligence has its seat everywhere in the cortex of the 



brain and in no part in particular. It iSy in effect, the sum 



and resultant of all of the images or representations derived 



from sensory perceptions. -.^ ,, 



■' y r r — Hermann Munk 



/ look upon the demonstration that the cortex of the brain 

 is the organ of the higher psychic functions — i.e.^ the organ of 

 intelligence^ in all its parts — as the most important result 

 of my researches. ^ P 



WE have seen that in lower mammals the 

 larger part of the cerebral cortex is occu- 

 pied by projection centers, each of which 

 is in direct connection by ascending and descending 

 fibers with some particular thalamic reflex apparatus 

 — visual, somesthetic, etc. — or, in the case of the 

 archipallium, with subcortical olfactory centers of the 

 hemisphere and both olfactory and non-olfactory 

 centers of the diencephalon. 



Each projection center in these animals probably 

 contains a core of cortex which is nearly purely of 

 projection type, that is, broadly connected by projec- 

 tion fibers with subcortical centers, and surrounding 

 this core there is a marginal zone with fewer projec- 

 tion fibers and a larger number of associational fibers 

 concerned with the correlation of this area with other 



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