Is it possible to house multiple alternate selves within the same brain? Dr. O'Leary argues that it is not only possible, but under certain conditions it is likely to happen. Dissociative Identity Disorder is discussed not as a "shattering of the self," but instead as a failure to integrate the self during development. Dr. O'Leary explores different biologically and computationally plausible models to explain how the self might fail to integrate during the normal proce...