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note: because important web-sites are frequently "here today but gone tomorrow", the following was archived from on May 9, 2000 . This is NOT an attempt to divert readers from the aforementioned website. Indeed, the reader should only read this back-up copy if it cannot be found at the original author's site.
Schumann’s Resonance Excess
(effects of EM fields on brain activity)
Increased geomagnetic activity appears on the days of so-called geomagnetic storms. Instability of the geomagnetic field is induced by the so-called magnetospheric micropulsations and causes W.O. Schumann’s“reasonance excess”. The strongest Schumann’s basic resonance component is the 7.8-Hz vibration.
A physical model of differences in some brain areas stimulated by different low-frequency magnetic fields was presented by Prof. Micek from the Physics Institute at the Jagiellonian University in Cracow. According to the basic thesis of the work, an EM field induces electric disorders in brain tissue which behave like a wave undergoing absorption, reflection, and refraction. These effects appear as a result of the presence of the areas characterized with different propagation speeds and their different absorptions as well as naturally limited areas like the cranium. In this model, the head is treated as a resonance system for electric courses. The electric wave is refracted or reflected. Thus Prof. Micek assumes that a standing wave appears in the system when the brain is surrounded by the cranium.
A 'standing wave' is the result of the interference (superposition) of 2 waves of identical frequency radiating in opposite directs (direct and refracted wave). It produces “arrows” and “knots” within the area. The arrows are characterized with maximal vibration amplitude and the knots with the lack of a variable magnetic field.
According to computer simulation evaluations of the model, a low-frequency 7-Hz field stimulates the temporal lobe areas and a 42-Hz field stimulates numerous areas around the brain.
In this physical model, although low frequency magnetic fields stimulate the whole brain, there are however some areas with bigger stimulations. Thus with a 7-Hz field, the temporal lobes are stimulated. While at 42-Hz, all of the brain area is stimulated.
Since in case of generalized seizures the discharges spread around all of the brain area and partial seizures involve only one area at-the-beginning, we conclude that changes of the brain bioelectric activity are significantly more frequent after a 42-Hz field application than after 7-Hz in patients with generalized seizures.
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