Hello everyone,
I am getting weird inverted u-shape signal on raw data collected here. This is seen when applying default parameter PSD on raw EGI data. I have never seen this pattern before. Do you know where it could come from ?
Thank you for your help
Thomas
It seems that your recording environment is noisy.
The 50 Hz and harmonics are visible, and this unknown noise source + harmonics.
Can you try to apply basic filters and see how it perfoms
The repeated inverted u-shaped patterns of the spectra is indicative of possible abrupt signal interruptions: please review the traces and crop those parts out, if any, before recomputing the PSDs.
Thank you Sylvain! Marking the first seconds of the recording as bad solves the issue
