THE CEREBRUM. 



559 



its connections with the sensor and motor areas of the Rolandic region, the 

 olfactory, and perhaps other regions, is engaged in associating and registering 

 body sensations and volitional acts, and that the knowledge thus gained has 

 reference largely to the personality of the individual ; that the parieto-occipital 

 association area, from its relation to the visual, auditory, and tactile sense 

 areas, is engaged in associating and registering visual, auditory, and tactile 



Motor and tactile area. 



Parietal association area 



and of Reil. 



Occipito-temporal 

 association area. 



Auditory area. 



Motor and tactile area. 



Parietal association area 

 (Precuneus). 



Olfactory lobe. 

 Olfactory tract. 



Occipito-temporal 

 association area. 



\ Olfactory area. 



Gyrus hippocampus. 



FIG. 256. DIAGRAMS TO SHOW THE POSITION AND THE RELATION OF THE ASSOCIATION AND 

 PROJECTION AREAS. THE PROJECTION AREAS ARE DOTTED. (After Flechsig.) 



sensations, and that the knowledge thus gained has reference mainly to the 

 external world. These assumptions in a general way are supported by the 

 phenomena of disease. In certain lesions of the frontal lobe the symptoms 

 indicate a loss or change of ideas regarding personality rather than of the 

 objective world, while the reverse is true in disease of the parieto-occipital 

 lobe. 



