[Eeglablist] "Subtract individual subject mean spectrum"——why the line charts of two groups are mirror inverted

Clement Lee cll008 at eng.ucsd.edu
Mon Sep 20 12:08:17 PDT 2021

Hi Luna,

Here's an older thread with a brief explanation of the option you mentioned.

You can justify either having the option on or off

Clement Lee
Applications Programmer
Swartz Center for Computational Neuroscience
Institute for Neural Computation, UC San Diego

On Fri, Sep 17, 2021 at 12:56 PM 杨璐娜 via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Hello,
> I'm trying to use the EEGLAB 14_1_2b STUDY set to plot spectra of 2 groups
> with the same number of subjects.
> After selecting "Subtract individual subject mean spectrum" option, the
> line of the first group and the line of the second group are mirrored in
> opposite directions along y=0.
> But in order to compare the differences between the two groups, I need
> them to be in the same direction. And when this option is not selected, the
> two groups are in the same direction.
> I looked in the manual but I think its not mentioned there. So, can anyone
> explain me why this option caused this kind of problem? And is there any
> way to change this situation?
> I would like to express my most sincere gratitude to the great support if
> you can help me!
> Luna Y
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