>> and so in the tick brain there's a relationship between what we call the motor behaviors or the movement and the limbic 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 i'm 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 scientifically exciting things about deep brain stimulation is that it offers the really uncommon opportunity to record the electrical activity from a living human being's brain. >> it's the cutting edge of what is known as neural network modulation. through their extensive work with parkinson's and other