So if you hear only a single voice in your head, then you're normal. It's called being normal.<p>If you hear your voice, AND other voices that do NOT belong to you, in your head, BUT, they can NOT control your body, then it's called Schizophrenia.<p>And if you hear your voice, and hear other voices that do NOT belong to you, and these voices can sometimes take control your body from you, then it's called Multiple Personalities Disorder.<p>This begs the question. Doctors keep saying the voices that Schizophrenia hear are not real. Yet, they themselves know that the voices they hear are real. As real as their own voice in their head. As real as the voice you and I hear in our head. The only thing is, the voices they hear, they know does not belong to them.<p>In other word, Schizo has some kind of brain defects where instead of the brain creating only a single voice, a single entity, the brain creates multiple voices. So those voices Schizo hear are not hallucinations, but rather, real voices like your voice in your head right now. Only problem is, those voices has no control over the body, unlike your voice.<p>However, if a defect happen, where the voices can temporary take over the body, then maybe that's what Multiple Personality Disorder is.<p>This also make sense why she becomes blind. She takes control of her body, but they take control of her vision.