that's what the scientists call it. and they fell that they need to move, and until they move, they don't feel better, and so, they get a sense of relief. >> between the two block, okay? >> and so, in the tick brain, there's a relationship between what we call the motor behavior, so the movement, and the lindic behavior, okay? and that's the actual systems in the brain that are encoding values for emotion. >> that sensation, the urge to tick, is what amber suffers from every day. >> it's like having 15,000 mosquito bites that you can't itch. you can't itch it. and they come out and you have no control, and you cannot take them away. >> one of the most scientif scientifically exciting things about deep brain stimulation is that it offers the really