216 



University of California Puhlications in Anatomy ["^^ol. 2 



tectural and functional plan of the whole nervous apparatus, especially 

 of the cortex, can profitably be undertaken. From this point of view 

 the first task is to establish the relationship between certain ner\'0us 

 functions and certain parts of the cortex. In view of the striking- 

 local variation in cortical structure, the various cortical localities 

 would be expected a priori to be responsible for some kind of primi- 

 tive or elementary neurodynamic processes, some ' ' partial functions, ' ' 

 different in different localities, the acts expressive of these being" 



Fig. 25. Experiment XIV. A diagram showing the left hemisphere from 

 above (upper figure) and its side view (lower figure) with two small strictly 

 cortical lesions (small dotted areas) of the occipital operculum (Oo). The 

 shaded area over the occipital operculum is the portion of the striate area; the 

 shaded area in front of the simian sulcus is the portion of the angular convolu- 

 tion supplied bv the association fibers originating from the lesions. (Compare 

 figs. 86-94.) 



usually simplified summaries of combinations of a higher, composite 

 order. At present the difficulties in solving' the problem of mental- 

 material relations appear, on the whole, to reside less in the sphere of 

 morphology than in the definition of the localizable elementary cortical 

 processes. Psychological methods of investig'ating the manifestations 

 of mental and associated phenomena are comparatively crude, and 

 clinical methods are even more so, dealing as they do, mostly with 

 composite symbols to which can hardly be assigned their adequate 

 morpho-dynamic parallels or correlates in restricted, narrow localities 



