PLATE III 



The extent of lesions in animals trained in visual discrimination. Arranged as 

 plate I. 



FIGS. 1-4. Animals which formed the habit of brightness discrimination after 

 operation. 



FIGS. 5-6. Animals with destruction of the frontal pole which retained the 

 visual habit after operation. 



FIGS. 7-8. Animals with destruction of the parietal region which retained the 

 habit of visual discrimination after operation. 



FIG. 9. Occipital control. 



FIGS. 10-12. Animals which lost the habit of visual discrimination after 

 occipital lesions. 



132 



