# 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
The results of these studies cannot yet be called exhaustive. Therefore, scientific research must continue. 4.1 Results of Studying the Interaction of Schumann Resonances with the Nervous System of the Human Body  
The historical foundation of research on the interaction between the human body and the Earth's magnetic field was laid by the German doctor [PERSON]. In 1952, he first discovered the fact that the main resonant frequency of the ionosphere, 7.83 Hz, coincides with the alpha wave range (7.5-13 Hz) of the electromagnetic activity of the human brain and scientifically proved it [71; 101; 102]. Modern research has confirmed and significantly expanded this scientific fact. At the end of the 20 st century, the relationship between SRs and brain activity was mathematically calculated. It was established that the resonant frequency for the human brain is approximately 10 Hz [103] and decreases depending on the increase in the size of the human skull [104]. Scientists from the University School of Electrical and Computer Engineering Melbourne (Australia), from the University of Alabama in Huntsville Electrical and Computer Engineering Dept Huntsville (USA) and from Custom Systems Pty Ltd. (Australia) in the period from 1984 to 2005 carried out studies on the resonant characteristics of human acupuncture meridians and their possible correlations with the rhythms of the human brain and Schumann resonance frequencies. Experimental results on the responses of human electrophysiological signals to \"geomagnetic\" and artificial environmental extremely low-frequency electromagnetic fields were compared. Frequencies between 8.8 and 13.2 Hz, which fall between the peaks of the SRs, were found to be mainly correlated with the analyzed human electrophysiological signals, and a correlation between the SR transfer function and human electrophysiological signals was proven. The researchers concluded that the human body absorbs, detects and responds to extremely low-frequency environmental electromagnetic field signals [104]. The study demonstrated the biological plausibility of the interaction of the Schumann resonance signal with the brain and changes in melatonin production [105]. The study confirmed that the electromagnetic fields of ultra-low-/extremely low-frequency waves of the environment interact with brain tissue at extremely low intensities, changing the flow of calcium ions, electroencephalogram results and reaction time. The brain cells use phase-locked loops to detect and respond to natural electrical signals in ultra-low-/extremely low-frequency waves. Laboratory experiments have confirmed that Schumann resonance frequencies alter reaction times in humans and monkeys. Human reaction times are also highly correlated with dose and Schumann resonance intensity, supporting this interaction. Ultra-low-/extremely low-frequency fields have also been found to reduce melatonin levels in animals and humans. At the beginning of the 21 st century, many parameters were established that detailed the connections between the human brain and the Earth's magnetic field. For example, in the right prefrontal sensor, theta activity (4-7 Hz) has a positive correlation with the strength of the Earth's atmosphere, an indicator of the strength of the steady state of the Earth's magnetic field [106; 107]. Parahippocampal activity and bitemporal coherence were found to be positively correlated with the k-index, or the strength of geomagnetic displacement. However, the strength of the relationship between geomagnetic activity and right and left posterior temporal lobe coherence was the strongest for coherence at 7.81 and approximately 20 Hz. This corresponds to the first and third harmonics of SRs [108]. It has been proven that there is direct synchronicity between the magnetic processes occurring in the human brain and the Earth-ionospheric cavity.