Comparisons between PSD

Discussions
1

Dear Francois,

Would you mind to tell me how to overlay multiple PSDs between subjects? (I searched the forum, but could not find a related posting. It might be very obvious to everyone else... )

I have 15 subjects, each has three scouts. Using the scout time series (mean before, 10s), I computed PSDs and averaged over trials. Thus, I have three average PSDs per subject. I would like to overlay the PSDs for all subjects -- 45 lines on one figure.

I use BS 16-Jun-2016 with MATLAB runtime.

Thank you in advance..

Chie

2

Hello,

After computing the PSD for each subject, you can concatenate these files in two different ways:

  • process Standardize > Concatenate signals
  • process Extract > Extract values (Concatenate signals: dimension 1)

Cheers,
Francois

3

Dear Francois,

I tried and it worked.
Thank you very much!

Chie

4

Dear Francois,

Thank you for the comment! I have an additional question which is related to the previous one. If we have 2 groups of participants and, thus, 2 averaged PSD maps (one per group) have can we visualise it on the one map? I mean we have one line for the first group and one line for the second, can we present it on the one figure? Like in the photo.

I tried to do it in Brainstorm, but did not find how.

Thank you!

Снимок экрана 2021-02-27 в 23.37.14
Снимок экрана 2021-02-27 в 23.37.14532×524 111 KB

5

Select the files you want to compare in Process1.
Run the process "Extract > Extract values" with the option "Concatenate signals". Select only the names of the channels you want to display.
It will generate one new file with all the selected signals.

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6

Thank you very much!