Thank you for your answer! The morph-function works when I change the grade from 5 to [inv[?src][0][?vertno?],inv[?src?][1][?vertno?]].
The mne.morph_labels function works as well. However, I have one question about the surf_name parameter. How does the choice of surface (white, pial? ) affect the results?
However, I have one question about the surf_name parameter. How does the
choice of surface (white, pial? ) affect the results?
This is just used to set the `label.pos` parameter, which is meant to give
the X/Y/Z locations of each vertex. It isn't really used anywhere that I
know of within MNE-Python (we just use the vertex number), though, so
shouldn't really matter for your use case.