Well, there's one thing for certain...you wouldn't be able to understand what anyone was saying!...because the auditory cortex is on the left side... whatever. In short, an interesting research field for more than just scientists or psychologists.
Anyway, Bascule, great thought. All I can say now is that I know it'd make a great science fiction novel...I don't know, there may be one already that fashions a plot similar to your idea. In fact, I'm almost sure I've seen/heard/read of something like this before.
Let me propose: If you stuck your head through 'the barrier' and you are now technically dead, wouldn't your body just slump down lifeless? Unless you had someone there to pull you back through, it's like walking (literally) to your death.
Am I getting you correctly? or would the computer simulation of your brain control bodily functions, thereby retaining motor skills and the ability to remain conscious or semi-conscious while remaining--technically--dead?
I think we do this already...Its called blogging. no let up there.