I think I could definitely say that if one's personality were completely changed, then one would cease to function as the same identity and would instead be someone new, even in the same body. And -- to head you off before you ask -- yes, I believe the reverse is also true: the same personality (that is, the same mind) transferred over to a new body would retain the same identity that had previously occupied the original body.

BOB: Now you've complicated things -- is identity of the personality or the mind? Or is the mind the seat of the personality, and also identity? In our first supposition of one who suffers a trauma and undergoes a personality change, suppose also that the memory is unaffected. Would identity have changed here, even though the two personalities share a consistent history?

CIN: Yes, I think that would be a fair assessment...
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