# Schumann Resonances and the Human Body: Questions About Interactions, Problems and Prospects
## 3 Results
### Earth's Magnetic Field and Schumann Resonance Frequencies: Origin and Essence
It was found that there are transient periods of \"harmonic synchrony\" that occur when calculating interchannel coherence between ultra-low-frequency magnetic activity originating in the environment and the caudal RMS signal that is received from the brain. These periods of harmonic synchrony have a duration of approximately 200-300 ms, and they are a phenomenon of simultaneous coherence in the ranges of 7-8, 13-14 and 19-20 Hz [109; 110]. It should be noted that a significant scientific contribution to the study of the influence of Schumann resonances on the human brain was made by scientists from Laurentian University (Canada). In 2012, Canadian scientist [PERSON]. [PERSON] of Laurentian University applied the concept of scale invariance to the study and found that the current densities of action potentials that propagate along the axon are similar to the densities of lightning strikes. [PERSON] concluded that the supposedly fractal connections between the processes that occur in the brain are a reflection of the electromagnetic processes that take place on planet Earth [111]. From 2009 to 2013, a major study was carried out at Laurentian University on the statistical analysis of electroencephalogram data from the human brain and their connections with SRs [112]. Canadian scientists proceeded from the idea that the human brain is a functional dynamic dipole, which has a potential difference on the order of 10-30 mV and has a shape typical of an ellipsoid. In their opinion, therefore, a relatively fixed volume and surface area of the brain and a rostral-caudal volumetric velocity of ~4.5 m s\({}^{-1}\) should generate constant standing waves with parameters very close to the fundamental Schumann resonance with a frequency of ~7.5 to 8 Hz. This is a resonant solution for the speed of light (3 \(\times\) 10\({}^{8}\) m/s) and the fixed circumference of the Earth (4 \(\times\) 10\({}^{7}\) m). It has been found that in many (but not all) individuals, electroencephalogram properties exhibit real-time differences in volume, three-dimensionality, coherence between spectral densities and power peaks with SRs. The researchers also concluded that these relationships are stable. The basis for this was the fact that for brain parameters, there were no statistically significant differences between the strength of the rostral-caudal, left-right comparison correlations or their power ratios for the entire sample and a random subsample of 10 respondents. Noteworthy is a study examining the connections between the emission of biophotons from the mouse brain and SRs [113]. It was found that the irradiation of mouse brain tissue with electromagnetic vibrations with frequencies close to the frequency of the first mode of the SRs shifts the maximum spectral density of biophotonic radiation at frequencies of 7.74 and 7.87 Hz. The level of magnetic field induction exceeded the background level of the SRs by 5-6 orders of magnitude. These data may be useful for extrapolation to the human body, since the fact that brain tissue is sensitive in vivo to the first-mode frequency is of interest for further research. Attempts have also been made to find connections between SRs and electroencephalogram data from sleeping people. A correlation was found between variations in the frequency of the second mode at 12-14 Hz and the frequencies of sleep spindles on electroencephalograms during the second stage of sleep (sigma rhythm) in humans [114]. In 2017, time-series correlation analysis revealed the response of the human autonomic nervous system to various dynamic changes in sunlight, cosmic rays and the surrounding magnetic field [115]. This study also revealed significant correlations between group measures of heart rate variability, Schumann resonance power and overall magnetic field changes. It was found that the participants' heart rate variability synchronized over the 31-day period in about 2.5 days, even though all the participants were in different locations.