[Eeglablist] Time codes of rejected segments

[Cedric Cannard]

Dear Jane,

How did you reject bad segments? Manually with the scroll plot?
If so, you can simply type "eegh" in the command window when you are done, and EEGLAB will print the latencies (in samples) of the bad segments. 

You create a variable in command line and paste the segment bounds like this for example:
bad_segments = [ PASTE ];

If you need these [start end] bounds in seconds, simply divide by the sample rate:
bad_segments = bad_segments ./ EEG.srate;

Note that to avoid removing too much signal, you can remove only the large artifacts with clean_rawdata plugin, and then run ICA and IClabel to subtract the artifactual components form the signal, while preserving the brain signals. 

Tutorial for running ICA: https://urldefense.com/v3/__https://eeglab.org/tutorials/06_RejectArtifacts/RunICA.html*independent-component-analysis-for-artifact-removal__;Iw!!Mih3wA!A4tYTr3BH_9r4be9VrzXQ59HsDNkYtkVRKWpzjEp9RTTG7UGVFjJ7FdUrP5M22M3oQNQHK8q_Urda4Y6mQDmz0QLFg$ 

Tutorial for automatic classification of components with ICLabel: https://urldefense.com/v3/__https://eeglab.org/tutorials/06_RejectArtifacts/RunICA.html*automated-detection-of-artifactual-ica-components__;Iw!!Mih3wA!A4tYTr3BH_9r4be9VrzXQ59HsDNkYtkVRKWpzjEp9RTTG7UGVFjJ7FdUrP5M22M3oQNQHK8q_Urda4Y6mQAafKCwtg$ 

Hope this helps,

Cedric Cannard


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------- Original Message -------
On Tuesday, May 30th, 2023 at 11:57 AM, Yana Klochkova via eeglablist <eeglablist at sccn.ucsd.edu> wrote:


> Dear all,
> 
> I’m dealing with EEG data, simultaneously recorded with fMRI. I removed the
> majority of gradient artifacts from the recording using plugins and now I
> have to delete the rest of the contaminated segments for further adequate
> performance of ICA. Afterward, I will need to synchronize EGG and fMRI
> recordings and that’s where the problem pops up. It’s obviously
> inappropriate to synchronize full fMRI recording with cut EEG recording
> hence I have to know accurate time points where each rejected segment
> starts and ends.
> So my question to the community: is there any «place» in EEGLAB where such
> data may be collected and seen? Or, maybe, is there another option how to
> automatically solve that problem and avoid the manual collection of the
> timecodes?
> 
> I’m a newcomer to the EEGLAB, please, take my apologies if my question
> refers to the well-known function. Thanks in advance for any help!
> 
> Best,
> Jane
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