The facial-feedback hypothesis states that whatever your facial expression is is what you are feeling, meaning that even if you are angry and you smile you will feel happy instead because of biofeedback from the facial muscles to the brain telling the brain what emotion to feel. However, people whose faces are paralyzed either permanently or temporarily can feel all the same emotions as before the paralysis occurred. Even those that are born with a condition that causes them to not be able to smile can feel the same amount of happiness as anyone else. Using facial-feedback, smiling even when you're not happy, is a form of mind-over-matter. The idea is that by smiling you're telling yourself that you are actually happy. This can work, but personally
