[Eeglablist] Analysis of TMS-induced harmonics in the EEG

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Jan 7 18:43:02 PST 2021


Dear Juliana,

I have been waiting for a person like you. Thank you for such a nice
question.
I am glad because the best way to study harmonics is to use my power-power
coupling analysis toolbox (PowPowCAT) which was just published last
December. Comodulogram/comodugram is the straightforward metric of
cross-frequency power coupling.

https://urldefense.com/v3/__https://www.mdpi.com/1424-8220/20/24/7040__;!!Mih3wA!UoxPibkD5yV6OGwVNDbdkDocyRfWscHLWk_rga1hmv9jvEnybfa7YUMXaF9oCQEvqseqNQ$ 
https://sccn.ucsd.edu/wiki/Cross-frequency_power-power_coupling_analysis_tool_(PowPowCAT)

PowPowCAT is readily available as an EEGLAB plugin (it's been there since
2017). Please try it out and let me know if it works for your purpose.
Looking forward to hearing back from you.

Makoto

On Thu, Jan 7, 2021 at 12:20 PM JULIANA CORLIER <corlier at g.ucla.edu> wrote:

> Dear list,
>
> I would like to get some expert advice on how to assess/quantify the
> presence of harmonics in the EEG.
> Notably, our lab is using EEG recordings during repetitive transcranial
> magnetic stimulation (TMS) and we would like to assess whether the
> stimulation at a certain frequency elicits an entrainment at the
> stimulation frequency but also at other frequencies.
>
> My first approach was to check for ‘ratios of frequencies’ that show
> activation in the time-frequecy domain post stimulation, but that turned
> out to be a more tricky than I have aniticipated.
> I was wondering if there is a proper approach to harmonics analysis?
> One would think that engineers and signal processing experts outside of
> neurosciences deal all the time with that.
>
> Any advice is much appreciated!
>
> Thank you!
>
> Juliana Corlier
>
>
>
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