hi everybody, I'm emmanuel charpentier, french guy from Paris and new to the list.
I find the duplicates thought interesting, and see how much it can lead to possibilities of divergences between two personas (and not one of them has the right to be called "original", isn't it?). The main divergence might not even be that you don't want to die or suffer amnesia, but might simply be that you have important knowledge you can't lose! (and there is knwoledge you can't share with others)
Did you think about partials? You only duplicate part of your neural net. Like in Greg Bear's eon, you use agents which are really copies of parts of yourself.
Another solution would simply be to have only one neural net (the original :) but many thought processes. The configuration/topology of the neural net is mainly the long term memory, the firing of neurons and synapses is mainly the working memory, so you just need to duplicate the later one... no? What you obtain is layers of persona. You can have 1000 thought processes and just one neural net configuration.
Of course, it could still leads to serious troubles: how do you share important new informations? How do you change the configuration of the neural net (I guess sleep is a key)? What do you do with your body, because you still have only one? Can a neural net layer function normally without a body? Can there still be divergences between layers? How do one layer integrate neural net changes made by another layer (if there are any)?