 Another candidate phenomenon is what used to be called Multiple Personality Disorder, now, more neutrally, Dissociative Identity Disorder (DID). Everything about this phenomenon is controversial, including whether there is any real multiplicity of consciousness at all (Hacking 1995; Dennett 1998a). DID can take two forms. The more common form is often described as the units (persons, personalities, sides of a single personality, or whatever one decides to call them) ‘taking turns’, usually with pronounced changes in personality. When one is active, the other(s) usually is(are) not. Here the most prominent symptom is usually strange memory gaps (amnesias) in each ‘unit’ for periods when the body in question was clearly conscious and active. In the other, less common form, both ‘units’ are present at the same time. Here, for example, the unit in control of speech will report that another ‘person’ inside her is, say, giving her orders, these orders being experienced not from the standpoint of giving them but as coming from another person. This form of DID is called the co-conscious form in the literature but the term names something very different here from what James, Parfit and the like had in mind when they used the term. Among other things, me and the ‘little person inside me’ are not unified in one consciousness. In fact, sometimes the dissociation in both forms of DID is behaviourally as complete as it is in brain bisection patients in the lab. 