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

[Clement Lee]

Hi Luna,

Here's an older thread with a brief explanation of the option you mentioned.
https://sccn.ucsd.edu/pipermail/eeglablist/2008/002320.html

You can justify either having the option on or off

Best,
Clement Lee
Applications Programmer
Swartz Center for Computational Neuroscience
Institute for Neural Computation, UC San Diego
858-822-7535


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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