# 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
SRs may have influenced early life forms that arose in the oceans, as extremely low-frequency waves with planetary wavelengths can penetrate hundreds of meters into the photic zone of the oceans (the sunlit upper layer of water). The estimated penetration depth of electromagnetic waves with a frequency of 8 Hz in sea water is 100 m [69]. Living organisms of the surface layer of water will be influenced by SRs in the same way as living organisms on the surface of the Earth. This is important for formulating the role of SRs as a biological electromagnetic factor participating in the evolution of life on planet Earth. Schumann resonant fields in the atmosphere have a magnetic field amplitude that is calculated in picoteslas and are significantly weaker than the Earth's quasi-static geomagnetic field. The biological effects of such weak electromagnetic fields can be realized due to the occurrence of the phenomenon of stochastic resonance. When a nonlinear system is exposed to a weak, undetectable periodic signal, stochastic resonance occurs. This weak biological signal then becomes detectable due to the phenomenon of resonance between the stochastic noise and the weak deterministic periodic signal [70]. The periodic excitation mechanism and external noise interact with each other. In this case, the energy from the noise spectrum is transferred to a single frequency, consistent with the signal, and the amplitude of the external noise is adjusted to the internal properties of the biological system. Because of this interaction, a clear peak is formed in the power spectrum of the output signal, and the signal-to-noise ratio increases. Therefore, lightning-induced extremely low-frequency fields and SRs can act as signals perceived by biological systems through the phenomenon of stochastic resonance. Thus, SRs can be a constant source of electromagnetic influence, which over millions of years of evolution could influence the development of biological systems and largely determine the electrical activity of organisms. Based on this knowledge, it is quite logical to assume the existence of a connection between the electromagnetic processes of the human body and the external electromagnetic fields of the Earth in the Schumann resonance frequency spectrum. Studying the Influence of Schumann Resonance Frequencies on the Functioning of the Internal Organs of the Human Body  
Research into the influence of Schumann resonance frequencies on the human body began at the moment of their discovery and continues in the present time, since the answers to many questions remain unknown and debatable. Conventionally, all studies conducted can be divided into the category of early studies and the category of modern studies. Early research was carried out with more primitive technical equipment and therefore became the historical basis for modern science. The history of early research is reflected in detail in the article of [PERSON]. [40]. From the perspective of solving the problems of this review, the most significant early studies include the studies of [PERSON] [41,42], [PERSON] and [PERSON] [71], [PERSON] [72], [PERSON] [73,74], [PERSON] and [PERSON] [75], [PERSON] et al. [76], [PERSON] [77], [PERSON] et al. [78], [PERSON] [79], [PERSON] [80], [PERSON] and [PERSON] [81], [PERSON] and [PERSON] [82], [PERSON] [43,44,83], [PERSON] et al. [84], [PERSON] et al. [85], etc. The results of these studies have varying degrees of reliability and validity. But they all indicate the influence of SRs on living biological organisms and the human body. They were unable to provide categorical conclusions regarding the mechanisms of influence of SRs on living organisms, but they substantiated the need to continue scientific research in this direction, confirming the existence of the Earth's magnetic field's influence on the human body in the frequency spectrum of SRs.