[Eeglablist] Removing 1/f in spectopo() before plotting topography at select frequencies.

Delorme, Arnaud adelorme at ucsd.edu
Mon Nov 18 07:41:12 PST 2019

Dear Brian,

When you compare conditions at the study level in EEGLAB, there is a checkbox (in the spectrum plotting options) that allows you to remove common spectral activity between conditions at the subject level (this will effectively remove the 1/f trend and in fact any activity in the spectrum that is common to the different conditions).

Best wishes,


> On Nov 15, 2019, at 8:48 PM, Brian Harvey <brian.harvey at biogen.com> wrote:
> Has an option been implemented in spectopo() or similar functions that can correct the PSD's for the underlying 1/f? Often times I am finding that scalp topographies are representing the power by absolute magnitude but not accounting for the signal-to-noise at any particular frequency.
> For example, would a channels that has a larger power at 40Hz but no peak at 40Hz be more representative of brain activation vs. a channel that has a distinct peak at 40Hz but the peak power is lower than that of the former?
> I appreciate your inpute.
> Brian Harvey
> Biogen
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