In this chapter I restrict myself to exploring the nature of the amnesia which is reported between personality states in most people who are diagnosed with DID. Note that this is not an explicit diagnostic criterion, although such amnesia features strongly in the public view of DID, particularly in the form of the fugue-like conditions depicted in films of the condition, such as The Three Faces of Eve (1957). Typically, when one personality state, or ‘alter’, takes over from another, they have no idea what happened just before. They report having lost time, and often will have no idea where they are or how they got there. However, this is not a universal feature of DID. It happens that with certain individuals with DID, one personality state can retrieve what happened when another was in control. In other cases we have what is described as ‘co-consciousness’ where one personality state can apparently monitor what is happening when another personality state is in control and, in certain circumstances, can take over the conversation.

~ John Morton

Among DID individuals, the sharing of conscious awareness between alters exists in varying degrees. I have seen cases where there has appeared to be no amnestic barriers between individual alters, where the host and alters appeared to be fully cognizant of each other. On the other hand, I have seen cases where the host was absolutely unaware of any alters despite clear evidence of their presence. In those cases, while the host was not aware of the alters, there were alters with an awareness of the host as well as having some limited awareness of at least a few other alters. So, according to my experience, there is a spectrum of shared consciousness in DID patients. From a therapeutic point of view, while treatment of patients without amnestic barriers differs in some ways from treatment of those with such barriers, the fundamental goal of therapy is the same: to support the healing of the early childhood trauma that gave rise to the dissociation and its attendant alters.Good DID therapy involves promoting co­-consciousness. With co-­consciousness, it is possible to begin teaching the patient’s system the value of cooperation among the alters. Enjoin them to emulate the spirit of a champion football team, with each member utilizing their full potential and working together to achieve a common goal.Returning to the patients that seemed to lack amnestic barriers, it is important to understand that such co-consciousness did not mean that the host and alters were well-­coordinated or living in harmony. If they were all in harmony, there would be no “dis­ease.” There would be little likelihood of a need or even desire for psychiatric intervention. It is when there is conflict between the host and/or among alters that treatment is needed.

~ David Yeung