Apply SSP projectors
Why exactly do you need to add this extra step?
ICA to remove blinks
Bandpass 1-50 Hz
Our recommended pipeline is to run all the frequency filters before any additional and more interactive spatial filtering.
- https://neuroimage.usc.edu/brainstorm/Tutorials
- https://neuroimage.usc.edu/brainstorm/Tutorials/Workflows#Common_pre-processing_pipeline
ICA+bandpass vs. bandpass+ICA would produce very different results.
Here is what the resulting ERP looks like without the visualization high pass:
As explained in the introduction tutorials, and in the red warning in the Filter tab:
Visualization filters are for visualization only, they are not applied to the data.
https://neuroimage.usc.edu/brainstorm/Tutorials/ReviewRaw#Filters_for_visualization
If the filters were correctly applied on the continuous files, adding visualization filters should not change the display (or a little bit, because of the edge effects of the filters, but definitely not as much as what you describe).
https://neuroimage.usc.edu/brainstorm/Tutorials/ArtifactsFilter