Hello FreeSurfer Experts,

Now I have a custom annotation file (only the cortical surface). May I ask how could I use it to extract the mean time series from the fsfast-preprocessed fMRI data? I have tried to transform this annotation file into anatomical volume first:

mri_aparc2aseg --s fsaverage --annot test --o test.mgz

It seems I cannot do it to the left and right surface respectively, right? How should use this .mgz file next? Any suggestions would be appreciated.

Best wishes,

Zhi Li