Our Brains, Our SelvesWhat makes us who we are? Is it our background that creates our identities? Or our families, where we lived, how we were brought up and educated, the jobs we've held? Yes, all of the above, but more fundamental than any of these is our brain. This is never more evident than if we lose even a single one of our cognitive abilities. People who develop a brain disorder can find that their identity, their sense of self, can undergo dramatic changes.