We all know what it feels like to be irritated by loud music, accosted by lights that are too bright, or overwhelmed by a world that moves too quickly. But millions of people suffer from Sensory Defensive Disorder (SD), a common affliction in which people react to harmless stimuli not just as a distracting hindrance, but a potentially dangerous threat. Dr. Heller provides tools and therapies for alleviating and, in some cases, even eliminating defensiveness altogether.