Ah, yes, you happened to bring up a couple of things that I forgot to mention.
I think it is possible for a Turning machine to recreate the exact actions of a human (given enough work) but without having any consciousness. There are two things I have to say about this though: Firstly, I think it is because they have been designed and manually programmed (analogous I suppose to your Sims example) to make certain actions. The second point though seems to present a sort of paradox (let's call it Zoto's paradox so I feel all scientific

) is that the "reasoning" the actual program has to make to calculate the agent's next action would have to be very similar to the reasoning that we make, even if it is executed differently. The fact that we know so little about consciousness and whether it's the actual reasoning that goes into it, or the method of which the reasoning goes into it is disputable.
My other point is related to what I said about design. I don't think a computer is conscious (in self awareness terms), but it is certainly capable of some reasoning. Imagine a processor as the brain. If you stuck in a webcam and put your computer out in the wild to survive (yes we can assume it can mate and pass down genes, etc, even if they are formatted differently to ours), then, if the processor within the first few generations was able to survive without our aid, would you then consider it conscious? I still don't know what to think of that.
Luckily though, a processor of this type doesn't just evolve. I think that the easiest way in Darwinian terms is through neural networks, which I believe can create consciousness, but as I said, not in boolean terms. The more complex (in technical terms, as I described earlier), the more conscious. You can see this in the fly example I mentioned (fly trying to get through glass).
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