Lots of possibilities allowed by general relativity (e.g. computers orbiting black holes and information traveling backwards through time) that may or may not c

Lots of possibilities allowed by general relativity (e.g. computers orbiting black holes and information traveling backwards through time) that may or may not correspond to our universe allow for computation beyond that of a Turing machine. Until we understand quantum gravity it seems premature to write off those possibilities. But that's completely irrelevant when it comes to the functioning of the brain, which operates in the oh so mundane medium size, medium velocity, medium energy scale which modern physics is able to model extremely accurately. I know that a few folks (Penrose, most notably) think that quantum gravity may be relevant to the brain, but that's an extreme fringe opinion, and in Penrose's case it's practically earned him full fledged crackpot status despite his numerous indisputable successes in physics.