Thanks azureseas, this is a fascinating topic. I find it interesting how a person can undergo something like this and still maintain a continuity of experience that spans the old and the new personality.
A TED Conference talk on this topic from a few years back is pretty good:
Jill Bolte Taylor got a research opportunity few brain scientists would wish for: She had a massive stroke, and watched as her brain functions -- motion, speech, self-awareness -- shut down one by one. An astonishing story.