Could the immortal soul be hiding away in Planck space? There have been several discoveries at the edges of physics that provide eerie hints that there's more to consciousness than can be accounted for by neurons firing. Unfortunately none (that I know of) have provided testable predictions, so they remain just that... strange. Perhaps now things are different? Regardless, science fiction writers (Dan Simmons in particular) have been characterizing consciousness as a quantum standing-wave function for years. It wouldn't be the first time such people were proven right after all.