You should read J.R. Lucas' famous article
Machines, Minds and Goedel. Here he addresses the problems with mechanism based on Goedel's theorems and, although I find some of the arguments kind of weak by today's standards, he gives a pretty good notion of the difficulties of developing a cybernetic brain and mind. (he has a revisited version which is much more current but I haven't read it).<br /><br />Here's an excerpt from near the end which I find interesting.<br /><br /><font color="yellow">So far, we have constructed only fairly simple and predictable artefacts. When we increase the complexity of our machines there may, perhaps, be surprises in store for us. He draws a parallel with a fission pile. Below a certain "critical" size, nothing much happens: but above the critical size, the sparks begin to fly. So too, perhaps, with brains and machines. Most brains and all machines are, at present, "subcritical"---they react to incoming stimuli in a stodgy and uninteresting way, have no ideas of their own, can produce only stock responses ---but a few brains at present, and possibly some machines in the future, are super-critical, and scintillate on their own account. (126) Turing is suggesting that it is only a matter of complexity, and that above a certain level of complexity a qualitative difference appears, so that 44 super-critical" machines will be quite unlike the simple ones hitherto envisaged.<br /><br />This may be so. Complexity often does introduce qualitative differences. Although it sounds implausible, it might turn out that above a certain level of complexity, a machine ceased to be predictable, even in principle, and started doing things on its own account, or, to use a very revealing phrase, it might begin to have a mind of its own. It might begin to have a mind of its own. It would begin to have a mind of its own when it was no longer entirely predictable and entirely docile, but was capable</font>