Humans have a sixth sense for Earth's magnetic field

So does this mean all fMRI studies are…wrong?

I work around a thumping great big magnet almost every day, have done for years, and I don’t feel anything. Unless I move too quickly - that’s not nice - but old age is helping with that. Sometimes I expect to find a mass of zombie-like people walking in circles around the building where I work (or maybe walking against the wall) but it hasn’t happened yet. Maybe they’re all walking off in the opposite direction?