Hello FreeSurfer Expert,

I've run into a problem that I just can't seem to solve. After downsampling teh ?.pial surfaces using mri_decimate to 20,000 surfaces and 10,002 points, I don't know how to create .annot files for the new surfaces I created. I want to be able to tell which ROI each vertex is in for my new surface based off a parcellation.

I've been trying to use mri_ca_label, mri_ca_train, and mris_sample_parc, but I can't seem to get anything to work.

Do you have any suggestions?

Thanks for your help,

Donelson Graham Berger