Hi,
When exporting the specparam data from brainstorm, the exponent of the aperiodic component is given. I was wondering how this exponent is calculated or determined. Thank you!
The general idea can be found in this paper, of course the algorithm evolved a bit over the years but the fundamentals didn’t really change : Parameterizing neural power spectra into periodic and aperiodic components - PubMed
It's computed with the specparam (aka FOOOF) algorithm. Check this tutorial for all the details:
https://neuroimage.usc.edu/brainstorm/Tutorials/Fooof