25 Mar
2014
25 Mar
'14
5:51 p.m.
Dear FreeSurfer experts,
I've performed a few first-level analyses of BOLD data with FSL, and have followed the instructions on the FS Wiki (http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/FslGroupFeat) to sample the COPEs of each run to a common surface (fsaverage) and run a fixed-effects analyses using 'mri_glmfit' across the runs.
The resulting gamma.mgh contains the COPEs per vertex across the runs. How would I find out the appropriate scaling factor and the baseline image to calculate percent signal change per vertex following these analysis steps?
Any help would be appreciated.
Thanks in advance,
Manuel Spitschan