A man who has lost all of his motor control is still able to communicate with his eyes. His family devised a sort of pen and paper scheme, which involves having these four columns. They point at yellow, he says yes, and then they list out each letter, and he says yes or no. The problem here is that he's aware that this ability to speak with his eyes is temporary. And so he asks, and the family realize that he wants some kind of strategy to go beyond this. A technique called auditory neuro fedback allows him to modulate activity by changing hi thoughts.