 The ability to predict future functional deficits raises a host of issues, many of which have been previously addressed by genethics (the ethics of genetics), since both provide information about future disease risk. What may be different is that the diseases for which neurotechnologies are diagnostically useful are those that affect the brain, and thus potentially mental competence, mood, personality, or sense of self. As such they may raise peculiarly neuroethical questions (see below).