Therapeutic misconception refers to the phenomenon by which patients who are invited to enroll in clinical trials that test new and unproven therapies (most often against a placebo) believe that they will be helped by the study drug and disregard the probability that they will be assigned to placebo. They do not see what they are doing as participation in an experiment but rather an offer of a new treatment for their condition. They often believe the the new drug will be of benefit to them (although the only way to do an ethically designed study is to be at a point where you have equipoise, that is to say you don't know (haven't proven) that the new drug is better than the existing therapy for this disorder).