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After some clarifications of "input", now I can better appreciate the idea that brain can generate outputs without inputs. Like Raven, I also find it interesting that after several weeks of discussion, we seem to regard brain as a seperate entity more often. However, this relatively new perspective of the brain may cause some medical or bioethical questions. For example, how should we deal with people in vegetative state? Since the brain can generate outputs on its own, will it be hard to distinguish the outputs generated on the will of the patient and those generated randomly?