LASH LEV— CEREBRAL FUNCTION 263 



When given an egg, he made efforts to break it by pounding it on the 

 floor, as he had done before the operation, and in the performance of 

 this habit both hands were used. 



Extent of Lesions. — The extent of the destructions is indicated in Figure 2 

 and sections through the area are shown in Plate 2. 



Right Hemisphere : The lesion extended cephalad from the median end of the 

 central fissure to the middle of the superior frontal gyrus, bordering the 

 longitudinal fissure but leaving the cortex of the median surface of the hemi- 

 sphere intact. Caudad it invaded the postcentral gyrus and completely oblit- 

 erated the fissure of Rolando. Laterad it extended well onto the operculum. 

 Only the paracentral gyrus and the lateral portion of the face area remained 

 intact. 



The second operation destroyed all of the caudate nucleus and the greater 

 part of the lenticular, leaving only the posterior end of the puramen intact. 



Fig. 2. — The extent of the lesions in animal No. 2. Reconstructed from 

 camera sketch and serial sections. The posterior border of the left precentral 

 gyrus escaped injury. 



Left Hemisphere: The lesion was less extensive than that on the right. It 

 began 5 mm. in front of the median end of the central fissure and extended to 

 the frontal lobe. All of the cortex of the median surface to the callosomarginal 

 fissure was destroyed. The posterior edge of the precentral gyrus remained 

 intact, for a width of about 5 mm. 



In this animal, practically all of the precentral gyrus of the right 

 hemisphere was destroyed. He was then trained in manipulative move- 

 ments of the right hand. This was followed by partial destruction of 

 the left precentral gyrus. ( )n recovery from paralysis, he gave clear 

 evidence of retention of the habits but owing to spasticity of the right 

 hand, made a direct transfer of the habits to the left hand. The right 

 precentral gyrus was almost completely destroyed, whereas a rather 

 large proportion of the left precentral gyrus escaped injury, but in spite 



