Dear Freesurfers,

I try computing the local gyrification index following the method developed by Marie Schaer and her colleagues. The process itself finishes without errors, yet there remain large grey areas of variable size on the cortex, indicating errors in the computation of the gyrification index. They are mainly situated in the regions next to the ventricles. I checked the reconstructed surfaces after running the recon-all command and there do not seem to be any errors or lesions.

My system is a Mac with macOS Sierra (Version 10.12.6) and freesurfer Version 6.0.0 is running.

Do you have any ideas what could cause these problems? Any help is appreciated!

Thank you in advance and best regards,

Kai Ohmstedt