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a body transplant.
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Or, as we might put it, a torso transplant.
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If we accept this version of the body theory,
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we say the crucial part of the body for personal identity
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is not sameness of torso.
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The crucial part of the body is sameness of brain.
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Just like "Follow the soul" was the answer
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if we believe in the soul theory of personal identity,
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if we believe in the brain version
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of the body theory of personal identity,
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same person or not? Follow the brain.
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Same brain, same person.