Dear Freesurfer experts,

I have fMRI data that are processed in AFNI that I would like to examine the relationship with cortical thickness measures. In particular, I am interested in vertex-wise correlation of thickness and BOLD % signal change.

The problem is I am new to Freesurfer. So far I have found that the program "mri_glmfit" appears to be able to handle vertex-wise regressor, with the -pvr option. First, does this enable me to do vertex-wise bivariate correlation? Second, if so, it appears that the input files need to be concatenated (or stacked??), and for FreeSurfer measures, "mris_preproc" seems to take care of it. But, how can I stack/concatenate the afni-generated files (which are registered to and mapped on to each individual's surface that are in .mgh format)??

I appreciate any input you may have-

-- Nobuko Kemmotsu, Ph.D. University of California, San Diego