EXPERIMENTAL PSYCHOLOGY 



patient of his knowledge of language. He may be 

 totally unable to speak (though as to this there are all 

 degrees of variation), and yet may comprehend what is 

 said to him, and be able to read, think, and even 

 write correctly. Thus it appears that Broca's centre 

 is peculiarly bound up with the capacity for articulate 

 speech, but is far enough from being the seat of the 

 faculty of language in its entirety. 



In a similar way, most of the supposed isolated " fac- 

 ulties" of higher intellection appear, upon clearer anal- 

 ysis, as complex aggregations of primary sensations, and 

 hence necessarily dependent upon numerous and scat- 

 tered centres. Some "faculties," as memory and vo- 

 lition, may be said in a sense to be primordial endow- 

 ments of every nerve cell even of every body cell. 

 Indeed, an ultimate analysis relegates all intellection, 

 in its primordial adumbrations, to every particle of 

 living matter. But such refinements of analysis, after 

 all, cannot hide the fact that certain forms of higher 

 intellection involve a pretty definite collocation and 

 elaboration of special sensations. Such specialization, 

 indeed, seems a necessary accompaniment of mental 

 evolution. That every such specialized function has 

 its localized centres of co-ordination, of some such sig- 

 nificance as the demonstrated centres of articulate 

 speech, can hardly be in doubt though this, be it 

 understood, is an induction, not as yet a demonstra- 

 tion. In other words, there is every reason to believe 

 that numerous "centres," in this restricted sense, exist 

 in the brain that have as yet eluded the investigator. 

 Indeed, the current conception regards the entire 

 cerebral cortex as chiefly composed of centres of ulti- 



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