[Freesurfer] How to extract beta weights, by condition, for whole-brain regression analysis

Dear FreeSurfers,

I have completed individual and group level functional analyses using FS-FAST, and would like to correlate individual differences in self-report measures against the betas for several of my 13 conditions (I used -gammafit in mkanalysis). My questions are: 1) Where are the beta weights located? and 2) How do I extract beta weights for each condition for each participant? I suspect that the solution involves the h files, but I'm not sure. Note that I'm trying to do a whole-brain analysis here-I know how to extract betas from functionally and structurally defined ROIs, but I don't know how to do this for the whole brain.

Any help will be greatly appreciated.

Thanks!

Dan Dillon, Ph.D.

Post-doctoral Fellow

Affective Neuroscience Lab

Dept. of Psychology, Harvard University

Phone: (617) 495-1889

E-mail: dillon@wjh.harvard.edu