[codeulike]

Roger Penrose, in Shadows of the Mind, reckoned Bose-Einstein condensates in the microtubules of neurons might be the engine of consciousness.

Apart from the weird quantum stuff, another interesting part of that perspective is that neurons are made up of countless microtubules and it might be the microtubules that are the basic computation unit of the brain. So then you can think of each neuron as a processor in its own right, and the computational complexity of the brain might be an order of magnitude higher than commonly supposed.