PSD extract values in pipeline editor

Bugs
1

Hi there,

Currently I encounter some problems with extracting values from a PDS and viewing the histogram.
I would like to view the histograms of different PDS and see whether they are similar or not. However, when I try to extract values of two different PDS plots in the pipeline editor, I only obtain one file in the intra-subject folder and I can't distinguish the two PDS plots any more (see pictures below).

Screenshot.png1920×1080 243 KB

Screenshot-1.png1920×1080 247 KB

When I do the same thing for the PDS plots separately it works fine:

Screenshot-2.png1920×1080 249 KB

I saw in tutorial 26 that it is possible to obtain two different files in the intra-subject folder, but these are based on time series. Is the problem with my approach that I use the PDS?

Thanks in advance!

Joliene

2

Hello,

This process “Extract values” you are trying to use is made explicitly to concatenate values from multiple files in one single file. Then the histogram display always shows all the values from the file.
If you want two histograms, you need two files, therefore you need to run this process “Extract values” separately for each file, or to use another process.

If you are only interested in one frequency band, the easiest solution is to compute the PSD only for this frequency band in the first place, instead of a computing a full spectrum and then extracting specific frequency bands.

Francois