I was talking with two PhDs (both teach IT related subjects) about artificial intelligence the other day. They were in agreement that an AI can never reach the level of the human brain, but failed to give me an explanation as to why that is so.
As far as I know, we simply don't know. We don't understand how the human brain works, but we also don't know any function that humans can calculate which is not Turing complete. On the contrary the Turing-Church hypotheses assumes that what humans "intuitively" can do is equal to computers. But only because there is no proof for it, it does not mean that the opposite is true.
My current understanding is that for an AI to reach human level intelligence is merely a matter of algorithms and computing power.
So have proofs been made that support the statement "Artificial intelligences can never reach the level of a human brain."?