The existence of conjoined twins like Tatiana and Krista proved to me years ago several things about consciousness.
1) It can be distributed.
2) It is substrate dependent.
:Some would read those two conclusions above as contradictory in a way, if the consciousness is bound to a singular substrate (one brain) as asserted in 2) how can it also be distributed across brains as asserted in 1) ??
The answer is that consciousness itself emerges from a piecing together of interactions between different cognitive modules that don't distinguish strongly what their sensory input drivers are. We know that the particular piece of brain that unifies the hemispheres and serv…