Forget the problem of repairing the brain.  Think of it in uploading
terms.  The theoretical question is:  "If you know where every single
atom in a frozen brain lies, could you extract an model of the brain's
operation with such high resolution that the informational damage caused
by freezing would not be significant (on a damage scale calibrated by
the effects of neural death and quantum/thermal randomness in day-to-day
operation)?"  I think this sounds reasonable; damage to structure on the
>10^6-atom-scale may appear to destroy the information contained on that
level of abstraction, but the same information should still be
obtainable from the internal structure of the mostly-untouched inner
volumes of the 10^6-atom units being shoved around.  If so, then the
practical question is extracting the information without causing exactly
the sort of atomic-scale disruption that would destroy that level of
abstraction as well.
-- 
               sentience@pobox.com      Eliezer S. Yudkowsky
                  http://pobox.com/~sentience/beyond.html
Typing in Dvorak         Programming with Patterns  Writing in Gender-neutral
Voting for Libertarians  Heading for Singularity    There Is A Better Way
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