Evidence of frequency-independent behavior of the volume conductor

[MakotoMiyakoshi]

Note the figure legend says "The very low and strongly frequency dependent values measured by Gabriel et al. (1996) represent an outlier, and although it has received substantial attention, it has to the best of our knowledge not been reproduced by any other study."

Ness TV, Halnes G, Næss S, Pettersen KH, Einevoll GT. 2022. Computing Extracellular Electric Potentials from Neuronal Simulations. Adv Exp Med Biol. 1359:179-199 DOI: 10.1007/978-3-030-89439-9_8, PMID: 35471540

[MakotoMiyakoshi]

See also: Pfurtscheller G, Cooper R. (1975). Frequency dependence of the transmission of the EEG from cortex to scalp. Electroencephalogr Clin Neurophysiol. 38:93-96. DOI: [10.1016/0013-4694(75)90215-1] (http://linkinghub.elsevier.com/retrieve/pii/0013469475902151#libraryItemId=6162915)

[EugenMasherov]

A similar observation (a personal communication from a neurophysiologist who performed observations during the surgery) led me to hypothesize that the frequency spectrum of signals from monopoles, dipoles, and quadrupoles differs, with monopoles generating the lowest frequencies and quadrupoles the highest frequencies. Furthermore, the signal from monopoles decreases inversely with distance, from dipoles with the square of the distance, and from quadrupoles with the cube. As a result, the closer we are to the source, the higher the average frequency of the signal. Of course, this is only a hypothesis, and even if it is confirmed, other factors influencing frequency cannot be ruled out. чт, 5 мар. 2026 г. в 20:15, Makoto Miyakoshi ***@***.***>:

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See also: Pfurtscheller G, Cooper R. (1975). Frequency dependence of the transmission of the EEG from cortex to scalp. Electroencephalogr Clin Neurophysiol. 38:93-96. DOI: [10.1016/0013-4694(75)90215-1] ( http://linkinghub.elsevier.com/retrieve/pii/0013469475902151#libraryItemId=6162915 ) — Reply to this email directly, view it on GitHub <#9 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/B2DLTZEWN7TIWZORZP75ILT4PGY4HAVCNFSM6AAAAACMXY2L2SVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTMMBRGMZDMOI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[MakotoMiyakoshi]

Of course, this is only a hypothesis

Oh, is it? I thought it is a theory hence it cannot be wrong.

After all, electrode size determines frequency characteristics.