In August 2007, US scientists used DBS on a 38-year-old man who was in a coma for six years because of a head injury. The patient was able to wake up, open his eyes, and turn his head in response to talking. After more DBS, the patient could name objects and use his hands. He could also drink liquid and eat food by mouth. Although DBS has worked for some patients with head injuries, DBS may not work for every patient with serious head injury and/or coma.