Dear François,
I’n experiencing problems with the export function to .eph. After epoching and averaging EEG recorded with Biosemi (128 channels + 1 external reference), I try to export a file to open it in Cartool.
When I open the eph file in Cartool, the signal is not readable. All channels appear flat and an additional (noisy) channel appears, which is numbered as 130.
If on Brainstorm I click on “edit channel file”, I can see that effectively 130 channels are listed. The 128 biosemi channels, the external reference, and another which is called “EEG BDF”. I thought this could be the reason why it doesn’t allow me to visualize the signal on Cartool, but apparently I cannot delete this EEG BDF channel, otherwise it will no longer open even in Brainstorm (it says that there is a mismatch between channels recorded - 129 - and the montage I’m trying to add - 128 ).
Since I want to run spatio-temporal segmentation of the EEG signal, I don’t really need external references in my BDF file, but even if I reduce the original file to 128 channels with Biosemi reducer (excluding the external reference), when I open it in Brainstorm, it keeps on listing this additional EEG BDF channel, which I cannot delete.
Do you have hints on what the problem could be? (I hope I was clear enough in my explanation and sorry for the long message!).
Thank you in advance