Sojourner,
Well, when the simulation was done of the rat's brain they did detect what would be considered thoughts, so logically a simulation of a human brain would have similar results...
Thoughts do not equal sentience on their own. What kind of "thoughts" can any brain have without some knowledge to pull from? Considering we still don't know how to encode knowledge/memories into the brain, I am skeptical that the simulated rat brain was having "thoughts".
"Impulses" might be a more accurate term. Now, if they provided the brain with sensory input and let it run for a while, these impulses might start to organize into something resembling thoughts and eventually consciousness based on the input it receives. Assuming of course that they properly model the ability to build memories.