Minimum Attenuation of Physiologically-Patterned, 1 µTesla Magnetic Fields through Simulated Skull and Cerebral Space


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.

Share and Cite:

M. Persinger and K. Saroka, "Minimum Attenuation of Physiologically-Patterned, 1 µTesla Magnetic Fields through Simulated Skull and Cerebral Space," Journal of Electromagnetic Analysis and Applications, Vol. 5 No. 4, 2013, pp. 151-156. doi: 10.4236/jemaa.2013.54024.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] H. E. Burke, “Handbook of Magnetic Phenomena,” Van Nostrand Reinhold Inc, New York, 1986.
[2] J. H. McElhaney, J. L. Fogle, J. W. Melvin, R. R. Haynes, V. L. Roberts and N. M. Alem, “Mechanical Properties of Cranial Bone,” Journal of Biomechanics, Vol. 3, No. 5, 1970, pp. 497-511. doi:10.1016/0021-9290(70)90059-X
[3] K. S. Saroka, B. P. Mulligan and M. A. Persinger, “Ex perimental Elicitation of an ‘Out-of-Body’ Experience and Concomitant Cross-Hemispheric Electroencephalo graphic Coherence,” Neuroquantology, Vol. 8, 2010, pp. 466-477.
[4] M. A. Persinger, K. S. Saroka, S. A. Koren and L. S. St Pierre, “The Electromagnetic Induction of Mystical and Altered States within the Laboratory,” Journal of Con sciousness and Research, Vol. 1, 2010, pp. 808-830.
[5] K. S. Saroka and M. A. Persinger, “Detection of Electromagnetic Equivalents of the Emotional Characteristics of Words: Implications for the Electronic-Listening Generation,” Open Behavioral Sciences Journal, Vol. 5, 2011, pp. 24-27. doi:10.2174/1874230001105010024
[6] C. Aaen-Stockdale, “The Neuroscience of the Soul,” Journal of the Psychologist, Vol. 25, 2012, pp. 520-523.
[7] L. J. Martin, S. A. Koren and M. A. Persinger, “Thermal Analgesic Effects from Weak, Complex Magnetic Fields and Pharmacological Interactions,” Pharmacology, Bio chemistry and Behavior, Vol. 78, No. 2, 2004, pp. 217-227. doi:10.1016/j.pbb.2004.03.016
[8] L. S. St-Pierre and M. A. Persinger, “Experimental Facilitation of the Sensed Presence Is Predicted by Specific Patterns of Applied Magnetic Fields Not by Suggestibility: Re-Analyses of 19 Experiments,” International Journal of Neuroscience, Vol. 116, 2006, pp. 1-18.
[9] B. T. Dotta and M. A. Persinger, “‘Doubling’ of Local Photon Emissions When Two Simultaneous, Spatially Separated, Chemiluminescent Reactions Share the Same Magnetic Field Configurations,” Journal of Biophysical Chemistry, Vol. 3, No. 1, 2012, pp. 72-80. doi:10.4236/jbpc.2012.31009

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.