Abstract
To answer the queries concerning penetrability of ~1 μT, physiologically patterned, time-varying magnetic fields through the cranium, the proportions of attenuation through thicknesses and densities of ~3 times that of the human skull were measured directly. There was no reduction in the intensity of the magnetic field when two 2 cm thick dried pine boards (4.3 × 103 kg·m-3) were placed between the pairs of solenoids separated by the approximate width of the skull. Although volumes of water containing intracellular concentrations of ions did not attenuate the field intensity, placement of 290 cm2 of 2 mm sheets of duct metal reduced the amplitude by 25%. Spectra comparisons showed a clear congruence in profiles between direct measurement of the applied field and the original computer-generated pattern. These results indicate there is little validity to claims that weak, time-varying magnetic fields applied in this manner are eliminated or significantly attenuated by the human skull.
Highlights
These results indicate there is little validity to claims that weak, time-varying magnetic fields applied in this manner are eliminated or significantly attenuated by the human skull
Magnetic fields are well known for their properties to penetrate matter with minimal attenuation [1], there have been occasional questions regarding the penetrability through the human cranium by magnetic field strengths in the order of 1 μT (10 mG) which are frequently found within the cultural electromagnetic environment
We designed a series of simple experiments that demonstrate that there is no measureable loss of intensity of magnetic field strength when these fields are applied through material that is 3 times the density and thickness of the human skull
Summary
Magnetic fields are well known for their properties to penetrate matter with minimal attenuation [1], there have been occasional questions regarding the penetrability through the human cranium by magnetic field strengths in the order of 1 μT (10 mG) which are frequently found within the cultural electromagnetic environment. The patterns of the applied fields are derived from theoretical or empirical imitations of whole-brain or localized activity by computerized software generated through custom-constructed digital-to-analogue converters. With this technology any pattern, those from biologically natural origins, can be extracted, digitized, and applied through cerebral space. We designed a series of simple experiments that demonstrate that there is no measureable loss of intensity of magnetic field strength when these fields are applied through material that is 3 times the density and thickness of the human skull.
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