CEREBRAL MOTOR CONTROL 



43 



Experiment 7 



Monkey 4- On July 25, 1916, the left motor cortex was destroyed in 

 the manner previously described. This brought about a right-sided 

 hemiplegia, with flaccidity of the arm and leg. 



Management and results. The movements of the left arm were pre- 

 vented by tightly bandaging that arm to the trunk. The special 

 treatment consisted in the stimulation of the extensors of the arm, the 

 shoulder muscles, and the muscles of the leg by friction, by the stimu- 

 lating of the corresponding nerves, and by the irritating exercises to 



FIG. 1. PART OP THE SUPERIOR SURFACE OF THE BRAIN OF MONKEY 4 



The obviously destroyed motor area is indicated by horizontal lines, and the 

 apparently abnormal post-central area indicated by vertical lines. C, central 

 fissure, partly indeterminate and indicated by the dotted line; S, fissure of 

 Sylvius. About natural size. 



cause the animal to make defensive and offensive movements. The 

 recovery was rapid, after the first few days the improvement being 

 marked. After three weeks of the treatment (August 18) it was not 

 possible to notice any difference in the activities of the two sides of the 

 body, the right arm being used as well as the left for such operations 

 as feeding and climbing, and the right leg being perfectly controlled and 

 coordinated in walking, running, climbing, and jumping. 



This animal had been sent from Washington to New Hampshire, 

 and on August 20 it was noticed to have coryza. This developed like 

 an influenza with pulmonary symptoms, and the animal died three days 

 later. The brain was removed and the accompanying diagram illus- 



