You can't just remove an arbitrary portion of the brain and still survive. There are bits of your brain that aren't duplicated, can't be bisected, and are absolutely necessary for survival.
So while it's an interesting question, it's impossible in practice (even if we had the capability of "reattaching" a portion of the brain).
So while it's an interesting question, it's impossible in practice (even if we had the capability of "reattaching" a portion of the brain).