Legion Theory proposes the existence of a number of independent cognitive/personality/memory streams, or selves, which act in parallel. Some of these selves are integrated to form a system which we call the corporate self. Two different types of selves exist.
In your brain your visual system integrates two parallel visual systems, one processing information from your left eye, and one from your right, to form a unitary visual system. Similarly, your brain integrates parallel personality systems or selves to form a unitary personality system – the corporate self.
The individual selves are quite independent. Each has its own unique set of memories, and each has its own disposition. At any point in time one of the selves will have executive control of the body, while other selves will usually be co-conscious.
Each of the selves has their own set of memories. And these memories will differ as the selves will view events from their own perspective and from their own disposition. Selves may share their memories with other selves. For some selves many of their memories will be acquired in this “second hand” way.
This will occur for a number of reasons. Firstly, they may not have been “born” at the time of the event. That is they may not have existed at the time of the event in question. Secondly, they may not have been awake at the time of the event. All selves do not have to be awake when the corporate self is awake. And selves may go into a type of hibernation which may last for days or years. Thirdly, they may have been separated from the corporate self when the event happened as they were undertaking an excursion into another realm at the time.
Selves can share their memories with other selves. They may choose to do so immediately, or they may delay and share memories seconds, minutes, hours, or years later. Or they might choose to never share a memory. It would not be unusual for selves to independently think about a particular issue and to share their thoughts a long time after an event.
Given their differing dispositions and different memories, selves within a system do not necessarily need to agree about a particular issue, or about the best action that needs to be taken. In fact, it would be quite usually for there to be a spectrum of views about an issue within a system. The actions of the corporate self in some situations will reflect a consensus of views of the selves of the corporate self. In other situations, however, the action taken by the corporate self will reflect the decision made by the particular self in executive control of the body at the time of the event.
Some selves integrate to form the corporate self, and at times will have executive control of the body. But this is not true for all selves. Some selves, the helpers, do not integrate with the corporate self, and under normal circumstances they never take control of the body. The helpers are selves whose purpose is to advise, rather than to act. They observe life, as lived by the corporate self, and subtly provide advice in the form of dreams, inspirational thoughts, and sometimes as inner voices.
Human experience comes about as an interaction between the system of selves, and the second great system of the human mind, that of the realms.