If, after years of living apart, my hemispheres were reunited, their memories of separate existence could, in principle, appear as the combined memory of a single consciousness. There would be no cause to ask where my “self” had been while my brain was divided, because no “I” exists apart from the stream. The moment we see this, the divisibility of the human mind begins to seem less paradoxical. Subjectively speaking, the only thing that actually exists is consciousness and its contents. And the only thing relevant to the question of personal identity is psychological continuity from one
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