The large context developed into specialized cerebral hemispheres, which are specialized, autonomous centres of action. The mind understands the world through two processes, one of information gathering and one of interpretation. The same process of interpretation is used for memories, dreams and new experiences. The self is only a part of the mind, and not always connected with the rest of it. The self shares the mind with other minds.
Minds take hold of consciousness depending on the needs of the moment.
Each mind tends to stay in place for as long as possible, with its own memories and goals. The self rarely notices what is going on. Continuity of the mind is an illusion. We are not the same person all the time. Different selves within the brain fight for control over the next action.