Hi,
I have functional datasets (.HEAD and .BRIK) from Afni that I'm trying to analyze in the surface domain using Freesurfer. I have Freesurfer anatomical surfaces for all my subjects, and have managed to use the tkmedit and tksurfer gui's to map my functional overlays (using the "calculate identity matrix" option) onto the volume and surface. What I'd like to do now is map the functional data onto a surface with a common number of nodes so that I can extract a matrix of beta values and do group level analysis using R. Tksurfer seems to be able to do this with the "Save plotted data to table" option (greyed over right now), however, I've read in other messages on the mail archive that the sphere.reg surface is not in common space. I've been trying to use func2sph-sess, but I seem to be missing something, getting "ERROR: cannot find any sessions." Maybe that's the wrong way to go about it?
Thanks, Emily