It appears that we have multiple channels of “magnetosense” which exist below the conscious mind. Several membranes that surround the brain (pia and dura) are found to have relatively high levels of magnetite. Our eyes use cryptochrome, and it could have the ability to “perceive” the geomagnetic field. Also, the nose has a magnetic sensor. Iron in hemoglobin, which makes blood-red is very receptive to all magnetic fields.
Epigenetics has been associated with the geomagnetic field!
“The zeitgeber is any external or environmental cue that entrains, or synchronizes, an organism’s biological rhythms to the earth’s 24-hour light/dark cycle and 12 month cycle”. The geomagnetic field can provide cues and entrainment which affect our deep brain functions!
(c) Paul C Adams 2014