They're also self-fulfilling prophecy. The diagnosis becomes the disease. A person who's told their entire life that they're a Leo will start to recognize Leo-

They're also self-fulfilling prophecy. The diagnosis becomes the disease. A person who's told their entire life that they're a Leo will start to recognize Leo-like behaviors and reinforce those. A person who's told their entire life that they're introverted/extroverted et al. will do the same.