This may be completely wrong, but I would just like to interject something related to the quantum state of the brain. Sodium-ion channels operate according to a stochastic mechanism (among others), that is dependent of the 3-dimensional structure of ion-channel protein in the membrane. The 3-D structure is then dependent on the chemical and electrical environment present in the brain at any time. At any point in time there is a chance of a sodium-channel being open or not depending on these factors, which suggest that there may be some kind of quantum effects going on in the brain.