Abstract
In 1954 and 1960 Koenig and his colleagues described the remarkable similarities of spectral power density profiles and patterns between the earth-ionosphere resonance and human brain activity which also share magnitudes for both electric field (mV/m) and magnetic field (pT) components. In 2006 Pobachenko and colleagues reported real time coherence between variations in the Schumann and brain activity spectra within the 6–16 Hz band for a small sample. We examined the ratios of the average potential differences (~3 μV) obtained by whole brain quantitative electroencephalography (QEEG) between rostral-caudal and left-right (hemispheric) comparisons of 238 measurements from 184 individuals over a 3.5 year period. Spectral densities for the rostral-caudal axis revealed a powerful peak at 10.25 Hz while the left-right peak was 1.95 Hz with beat-differences of ~7.5 to 8 Hz. When global cerebral measures were employed, the first (7–8 Hz), second (13–14 Hz) and third (19–20 Hz) harmonics of the Schumann resonances were discernable in averaged QEEG profiles in some but not all participants. The intensity of the endogenous Schumann resonance was related to the ‘best-of-fitness’ of the traditional 4-class microstate model. Additional measurements demonstrated real-time coherence for durations approximating microstates in spectral power density variations between Schumann frequencies measured in Sudbury, Canada and Cumiana, Italy with the QEEGs of local subjects. Our results confirm the measurements reported by earlier researchers that demonstrated unexpected similarities in the spectral patterns and strengths of electromagnetic fields generated by the human brain and the earth-ionospheric cavity.
Highlights
The possibility that the electrical components of the time-varying electrical potentials produced by the brain may occasionally overlap and become synchronous with ultra-low frequency (ULF) electromagnetic activity occurring within this resonant cavity was originally observed and reiterated by Koenig and his colleagues [2,3]
Results of the analysis indicated the presence of transient periods of ‘harmonic synchrony’ that appeared when cross-channel coherence was computed between the caudal root-mean-square signal derived from the brain and the extremely-low frequency (ELF) magnetic activity occurring in the proximal environment
The average disparity of potential difference between the two axes reflects the proportional distance between the sensors
Summary
The possibility that the electrical components of the time-varying electrical potentials produced by the brain may occasionally overlap and become synchronous with ultra-low frequency (ULF) electromagnetic activity occurring within this resonant cavity was originally observed and reiterated by Koenig and his colleagues [2,3] In their publication they noted qualitative congruencies between the waveforms of electroencephalographic activity recorded from the scalps of human subjects and patterns of naturally occurring electromagnetic activity (Type I and II signals) that are generated by global lightning, in tropical regions close to the equator where lightning is observed year round. In particular the Schumann resonances, which are traditionally defined by spectral peaks at approximately 8, 14, 20, 26, and 33 Hz [4], show remarkable consistency with electroencephalographic activity in terms of frequency and intensity; both exhibit average magnetic field intensities of about 1–2 picoTeslas and when the average cortical thickness of about 3 mm is accommodated both exhibit electric field intensities approaching .1 to 1 mV/m
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