[Freesurfer] working with cluster annotations in fs-fast

Hi folks,

I'm trying to split a cluster from mri_glmfit-sim into two separate regions. (Ginormous blob of activation across multiple structures of interest...)

I've gotten to the point of generating a new annotation with the separate labels for my separate regions, but am stuck getting a "cluster size" for the new labels. It looks like one can't use mris_anatomical_stats on fsaverage... but something like that must be happening inside of mri_glmfit-sim to get cluster sizes? What's the best way to get these values for my new annotation? (Or is this a terrible idea for some reason I haven't yet considered?)

Thanks! Abby Noyce