Right. The question is not whether or not there eist quantum effects in the brain, but whether they have any effect at all. Right now, there are only theories: no empirical data exists to prove or disprove the theory.
People may have a crappy built-in magnetometer, but it seems you don't need one - just a lot of practice. There are cultures that put such weight on the cardinal directions that they always maintain a sense of where they are facing.
Very interesting. I always had a very accurate sense of direction, to the point of not needing a compass when bushwalking to a map. Yet, when I moved to the other side of the continent, I was completely thrown.
I wondered to myself whether it was something to do with the very different magnetic declination. No evidence, of course.
I moved back and have regained it again. Mysterious.
