Why start with the human brain? Why not do something simpler first? We can't even simulate the C. elegans brain yet http://lesswrong.com/lw/88g/whole_brain_emulation_looking_at... and that is ridiculously simpler than the human brain.
From the FAQ - Why not begin with simple organisms like C.elegans? There are two problems here. The first is feasibility; the second is the relevance of our results. Feasibility. Neuroscientists have mapped all of C.elegans’ 300 or so neurons. However, enormous amounts of key data needed are still missing. For instance we do not have enough data on the physiology and pharmacology of C. Elegans neurons and synapses. A…
Once the big projects have cracked the low-level details, someone will figure out C. elegans. Until we have some smaller organisms emulated, don't expect to have a conversation with their emulated human brain, I just can't see that happening out of order.