Hi,
I am trying to find a way to remove noisy parts of the continuous EEG recording. E.g. I selected noisy part of the EEG, it still remains in the recording. How to proceed and remove the selected bad segment?
I also have the second question. When the data is imported, it is asked to remove DC offset and to select baseline for that. If the recording is continuous what should be the option for selecting baseline? Should I choose the option All Recording: baseline computed for each output file?
Thanks
I am trying to find a way to remove noisy parts of the continuous EEG recording. E.g. I selected noisy part of the EEG, it still remains in the recording. How to proceed and remove the selected bad segment?
We never remove bad segments, we mark them as bad when reviewing the continuous files (when using menu "Review raw file" instead of "Import MEG/EEG").
https://neuroimage.usc.edu/brainstorm/Tutorials/ChannelFile#Review_vs_Import
https://neuroimage.usc.edu/brainstorm/Tutorials/BadSegments
Bad segments are ignored from some processes (eg. PSD) and when epoching/splitting the recordings, the epochs overlapping with a bad segment are marked as bad.
https://neuroimage.usc.edu/brainstorm/Tutorials/Epoching#Import_in_database
If you want to process continuous recordings (resting state/stead state) and really need to remove back blocks, you can review the continuous file, mark bad segments, import the recordings to the database with the option "Split" selected (blocks of 1s for instance), then concatenate all the blocks again (with process "Standardize > Concatenate time"). If you need a continuous file again, you can right-click on the concatenate file > Review as raw.
When the data is imported, it is asked to remove DC offset and to select baseline for that. If the recording is continuous what should be the option for selecting baseline? Should I choose the option All Recording: baseline computed for each output file?
It is probably not a good idea to select this option for long continuous files.
Maybe using a high-pass filter with a low frequency cut-off could be a solution for removing the signals arbitrary offset and slow fluctuations.
