[Freesurfer] What's the difference between pc1 and spc (glmfit)

External Email - Use Caution Hey Freesurfers, I'm running a longitudinal study and have multiple outputs in my results. What's the difference between the "pc1" files and the "spc" files? Also what do the "rate" and "avg" files represent? Any response would be greatly

Re: [Freesurfer] What's the difference between pc1 and spc (glmfit)

Hi Ken, * Avg: average cortical thickness between time-points * Rate: rate of change of cortical thickness * pc1: rate of change wrt. the first time point * spc: rate of change wrt. average thickness You can find more info about these in this Longitudinal Tutorial:

Re: [Freesurfer] different clusters in mri_surfcluster output versus viewing in Freeview

External Email - Use Caution Thanks for explaining that, Doug. From: freesurfer-boun...@nmr.mgh.harvard.edu on behalf of Douglas N. Greve Sent: Thursday, February 23, 2023 1:18:10 PM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer]