Hi,
I have generated surface area maps for a sample of subjects (using [mris_preproc --fsgd *.* --target fsaverage --hemi *h --meas area --out *.mgh). When I created a mean image across all subjects (163842 x 1) and looked at it in tksurfer, I noticed a pattern on the surface that's a little troubling. Please see the attached image file (patterninmeanareaimg_ allsubjs_unsmoothed.jpg).
I sampled the curv files to ico (with *mris_preproc*) for all subjects and looked at them individually (I have attached a few figures). I did find four resampled curv.mgh's that looked unusual, but removing them did not change the pattern seen in the attached figure. I also looked at some of the individual area files resampled to ico (using make_average_subject) and the outliers there were identical with the ones identified using the resampled curv-files (perhaps unsurprisingly). All these images are unsmoothed.
So I'm at a loss here. Any suggestions on what to do next in terms of trouble shooting?
(PS! I have attached the resampled curv and area files for a normal subject in lh_104_curvsjekk_lateral.jpg and lh_104_areasjekk_lateral.jpg, and for an unusual subject in lh_81_UNUSUAL_curvsjekk_lateral.jpg and lh_81_areasjekk_lateral.jpg. The three other subjects that seemed unusual looked like subject 81, and all the other subjects looked like 104.)
Thank you!
