So, there is now evidence that magnetic fields can affect our brains. Imagine what a magnetic pole shift might mess with our heads...

Just two minutes of magnetic stimulation can alter the brain for an hour, according to a University of College London (UCL) study ... The UCL team has been studying methods to improve a technique called transcranial magnetic stimulation (TMS). ... Longer-lasting effects may enable TMS to be used to modify brain activity in order to treat a wide range of brain problems, ranging from depression to brain damage. TMS involves the use of a magnetic coil that's held outside the skull. This coil, which can be moved over different parts of the head, creates magnetic fields that induce tiny electrical currents inside the brain. These electrical currents alter the activity of neural pathways, stimulating or inhibiting activity in different areas of the brain.

Source: Health Central