FIG. I. Right-sided traumatic 

 hemiballism. Following the order 

 to lift both arms the affected right 

 arm is raised with delay and over- 

 shooting. The fingers take an 

 athetoid posture. Then suddenly 

 there begin forceful flexion syner- 

 gic movements of the right arm 

 and right leg with closing of the 

 fist (right ankle flexed by 

 tenotomy). After the right arm is 

 caught with the left, it goes in a 

 sudden extension together with 

 the right leg. During the ballistic 

 movement there is forced laugh- 

 ing. All the movements in the iG 

 pictures lasted less than 2 sec. 

 [Redrawn from motion pictures 

 made by Hassler (84).] 



866 



