This study on the penumbra kind of reflects on what I consider to be necessary.
http://onlinelibrary.wiley.com/doi/10.1111/j.1747-4949.2010.00444.x/full
Mainly that the penumbra be identified so therapies can be directed for that damage
as compared to dead brain damage which should have completely different therapies.
Reading this is obviously not for laypersons, it may as well be written in Sanskrit.
I did ask the question on PhysioBob if the therapists there had different protocols for penumbra recovery vs. dead brain recovery, but no one answered. I hope that was just because they don't answer survivors rather than they didn't understand the question.
At least it does prove that PET scans can visualize the penumbra.
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