Every human head carries around equipment for two fundamentally different perspectives on reality; a brain can think in two different ways, see the world from two different angles, if you will. Analogous to binocular vision, this duality allows us to perceive the depth of concepts just as having two eyes lets us distinguish the distances of real world objects.
No sane human, however, would ever suggest that there are two cyclopses living in their head, each seeing the world from a slightly different angle and then quickly comparing notes to judge distances; yet that is essentially what happens. Similarly, it is a mark of mental illness to suggest that your own head houses two distinct people; you might think of things this way, and then that way, but in each process the goal of the act of thinking is the same, so there is only one identity involved.
Imagine, however, physical barriers of bone and distance. Imagine as well a different, more difficult, method of communication; within a single brain, it's a thin band of fibers called a corpus callosum carrying electrical signals; what if it were words and body language? Does it become sane to call yourself different people then? Does following conflicting processes to conflicting goals suddenly make sense because communication becomes less efficient?
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