In The Ethics of Killing Jeff McMahan wonders:
[You are] a member of a set of identical triplets, all of whom are involved in an accident. While [your] brainstem and various vital organs are irreparably damaged, [your] cerebral hemispheres[, the seat of your consciousness,] are unharmed. In the case of both other triplets, however, their brainstems and bodies are undamaged but their cerebrums are destroyed. Surgeons are able to extract [your] cerebrum intact but, instead of transplanting it whole, they divide it and transplant each hemisphere into the body of one of the two remaining triplets. [Assuming your] hemispheres were symmetrically developed, the two people who are brought to consciousness after the operations are both fully psychologically continuous with [your]self as [you were] before the operations. Both believe themselves to be [you] and both have bodies almost indistinguishable from [your] own (p. 23).
... where does your soul end up?
