Brain and body electromagnetism represent an electric/magnetic flux of small intensity which is difficult to measure remotely. However, upon a certain excitation event and specifically spin excitation in the frame of magnetic resonance, it is possible to generate a measurable electric/magnetic flux. The resolution of signal acquisition can be low, if the signal is biocorrelated i.e. correlated to biological signals and cognitive models similarly to magnetic resonance fingerprinting.
The magnetic field of the Earth is transformed into a gigantic magnetic resonance scanner. Possibility to also use the electric field gradient of the Earth's atmosphere.
How do we compensate for the low static magnetic field strength of the Earth's magnetic field?