 At a time, situations of disorder in which unified consciousness is retained may take a number of forms. There are cases where consciousness seems to split within one brain and body. The much discussed commissurotomies (brain bisection operations) are the best known example. (Across time, the closest analogue may be dissociative identity disorder, about which more shortly.) There may be cases in which a single occurrence of unified consciousness spans two bodies; some have said this about some mirror twins. And there are cases in which the array of phenomena over which unified consciousness ranges becomes strangely circumscribed: hemi-neglect and anosognosia are two examples. (We will describe all these phenomena in more detail below.) What is interesting for our purposes is that in all these kinds of cases, those in which unified conscious seems to split, those (if any) in which it seems to span two bodies, and those in which its range seems to shrink, the unity itself seem to be intact. It has not been destroyed or even damaged. It is just housed in an unusual way.