In this paper is argued that additionally to the natural ambient ELF electromagnetic fields (magnetic oscillations, Schumann Resonance, etc.) additional ambient ELF magnetic field is generated by endogenous EM consciousness mechanisms in nearby humans. They are proposed intensities in the 1–10 nT range at distances of a few meters from the source.
It also summarize some investigations that without doubt confirm possible sensitivity of biosystems to fields of that intensity.
It must be said that there are studies that show that isolation from Schumann Resonance frequencies affect numerous biological parameters, and for example, the physical condition of early Astronauts deteriorated severely whilst in Outer Space, away from the Schumann Resonance. The problem was solved by introducing a "Schumann Simulator" into all space shuttles, a magnetic pulse generator mimicking the Earth's frequency.
There are various theories about mechanism that behind this sensitivity, that can involve non-linear resonant absorption of ULF/ELF oscillating signals into systems that use natural ion oscillation signals in the same frequency range . But also it must be taken into account the similarities of these electromagnetic fields with those originated in the brain 
 Schumann Resonances, a plausible biophysical mechanism for the human health effects of Solar/Geomagnetic Activity
 Human Quantitative Electroencephalographic and Schumann Resonance Exhibit Real-Time Coherence of Spectral Power Densities: Implications for Interactive Information Processing
Last modified on 11-Jul-16