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. 2016 Jan 19;11(1):e0146595. doi: 10.1371/journal.pone.0146595

Fig 7. Local Harmonic Synchrony.

Fig 7

Cross-channel coherence between the caudal root-mean-square derivation and extremely low-frequency electromagnetic activity recorded simultaneously in Sudbury, Canada for one male and one female measured on separate days. Evident in this time-frequency analysis is harmonic synchrony occurring between brain electrical activity and atmospheric ‘noise’ at approximately 8, 13 and 20 Hz which define the first three harmonics of the Schumann resonance.