 Might you be part of the organism associated with you—namely, the brain (more precisely, the portions of the brain associated with consciousness) (McMahan 2002, ch. 1)? But the brain seems capable of surviving death, when you are supposed to go out of existence. Are you then a functioning brain, which goes out of existence at the irreversible loss of consciousness? But it seems odd to identify the functioning brain—as distinct from the brain—as you. How could you be some organ only when it functions? Presumably you are a substance (see the entry on  substance),  a bearer of properties, not a substance only when it has certain properties. One might reply that the functioning brain is itself a substance, a substance distinct from the brain, but that, too, strains credibility. Might you instead be not the brain, but the mind understood as the conscious properties of the brain? That would imply that you are a set of properties, rather than a substance, which is no less counterintuitive. Note that the charge of incredibility is not directed at the assertion that the mind is the functioning brain, or is a set of brain properties, and not a distinct substance—a thesis in good standing in the philosophy of mind (see the entries on  identity theory of mind  and  functionalism).  The charge of incredibility is directed at the assertion that you are a set of properties and not a  substance.[2]