he's still that goofy kid. and there are moments when he's free enough of anxiety that he can express that. but it's only moments. it's not days. it's not hours. it's -- it's not enough. >> this, his doctors believe, is both his best and last hope. deep brain stimulation or dbs. >> how are you feeling right fowl, brent? >> i feel happy. >> foal happeel happy? >> to short-circuit the signals that cause so much fear and anxiety. >> he became really happy. his mood was really elevated. he was talking a lot better. >> i feel like laughing for some reason. >> you feel like laughing? that's good. >> we want to know when you're having those feelings, tell us. >> later when the electrodes are