36 



PSYCHOLOG Y. 



169 cases carefully studied by Exuer. The parts shaded 

 are regions where lesions produced no motor disturbance. 



Fig. 8.— Right Heciisphere of Human Brain. Lateral Surface. 



Those left white were, on the contrary, never injured with- 

 out motor disturbances of some sort. Where the injury to 



FiG. 9.— Right Hemisphere of Human Brain. Mesial Surface. 



the cortical substance is profound in man, the paralysis is 

 permanent and is succeeded by muscular rigidity in the 

 paralyzed parts, just as it may be in the monkey. 



