154 Dr. Grunbaum and Prof. Sherrington. [May 25, 



usual, movements of elbow and shoulder, but not of hand itself or 

 only of hand late in a general arm movement, and that very rarely.. 

 In short, neither the ablation or the excitation methods gave any 

 evidence that the remaining part of the arm area had 

 functions of the ablated hand area. The recovery of hand moveinen 

 seems, therefore, not due to either the adjacent cortex of the sam 

 hemisphere, or to the corresponding hand area of the cort. 

 opposite hemisphere, taking on the functions of the ablai 



hand area. 



Faradisation of the cortex of the post-central convolution, tl 



Sulc.cailoso 



Swbc.calcourin 



C.S.S.rffi/. 



not like the pre-central itself eliciting movement, when employed at 

 certain places facilitates the elicitation of movement by faradisation at 

 certain points at about the same horizontal level in the pre-central con- 

 volution. In other words, from certain parts of the post-central 

 convolution, a facilitating influence (Bahnung) can be exerted upon 

 somewhat adjacent parts of the pre-central convolution. 



Removal of the adjacent levels of the pre-central convolution does 

 not render the post-central convolution "excitable;" that is to say, 

 destruction of the pre-central convolution does not make it the more 

 possible to obtain movements under faradisation from the post-central 

 convolution. 



The motor cortex of the infant chimpanzee, a few weeks old, is 



