THE treatment of paralyzing spasms that prevent the use of any remaining voluntary motor activity of the spastic limb is a notorious neurosurgical and orthopedic failure. Since the potential use of such a limb may be close to normal and, in any event, may be at least partially recoverable through exercises and other physiotherapeutic therapy that is impossible in the presence of spasms, some method of relieving the spasm and at the same time preserving controlled voluntary motion is fundamental to its success. This paper is a preliminary report of what appears to be such a method. It is reported . . .