In my intro classes I like to start off with personal identity. Any continuity view of personal identity is threatened by fission/split-brain cases.
When I discuss these cases, a handful of students typically balk at the far-fetched nature of the cases where brains are split and a half survives. It strikes them as even more far-fetched when you add to the case that memories and personality remain in tact after the split.
Here’s a recent Newsweek article that should make these cases seem a little less removed from the real world.
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