 As a rough grouping tool, we will treat unified consciousness as breaking down in ways that fit a two-by-two matrix. The cases we will consider can be grouped according to whether unified consciousness appears to continue but in an unusual form, one instance of it splitting into two for example, and situations in which it appears to deteriorate more severely, to the point where it may even be said to have been destroyed. And we will find examples of both kinds that occur at a time and across time. Indeed, some of the disorders that we will examine are both at a time and across time.