brain trauma

It is this sort of layered questioning early in the novel where The Measure of Darkness is at its strongest and most emotionally resonant—who are you if the very skill that has been your reason for existence has been taken from you? And on a secondary level, what it is like to rationally know that your own perceptions and the basis for your own experience can no longer be trusted—to be told of, but to not actually experience the ways in which your perception is flawed?