A brain can certainly memorize and follow a fixed set of rules to update the tape on a Turing machine. Therefore the brain is at least a Universal Computer. Furthermore there is nothing in the domain of sensory-motor tasks that is in principle beyond computer controlled robotics. So then praytell, what can a brain do that a computer can't?
Careful. The current answers to that question live on a small island that's been eroding at an alarming pace. Some project that the island will be totally washed away in our lifetime. You sure you want to build there?
>Careful. The current answers to that question live on a small island that's been eroding at an alarming pace. Some project that the island will be totally washed away in our lifetime. You sure you want to build there?
The answer to that question is capabilities usually attributed to Strong AI. Depending on who you ask, we are currently either 10 years or forever away from that, which pretty much means the same.