4. Preclinical evidence. Prolonged DBS improves other symptoms of SCI as well as pain. The Investigators have found that various types of sensory and motor performance and anatomical damage are restored. Recovery of autonomic dysreflexia, and improvements in gastric emptying, insulin level and glucose control have been measured more recently. These improvements remain when the stimulation ceases. Separately from pain, it is important to find out in man whether the Investigators can safely replicate these findings, with possible great benefit to patients. Thus there is a potential for (a) immediate pain relief, (b) long-term changes in pain status (such that the stimulation can be reduced or stopped), (c) general improvement in different visceral or motor symptoms of the SCI syndrome.