Hello Freesurfers
I would like to run a specialized group GLM analysis on the volume using estimates from the individual subject analysis in Freesurfer as summary statistics. I would like to learn a little more about how this estimation is done before doing so. I have looked at the documentation for "mri_glmfit" and the following tutorial: http://surfer.nmr.mgh.harvard.edu/fswiki/FsFastTutorial I also have your 1999/2003 manuscripts on "Signal Processing and Statistical Analysis for Event-Related fMRI" and "fMRI Analysis 101 - Univariate Analysis," but I am not sure if the method has been updated since then.
* I noticed there is a weight matrix (W) described for "mri_glmfit" command. How is this derived and used? I can't find more information about it in the documentation/mailing list. * How are the nuisance regressors organized in the B matrix? I assume the conditions are first? What are the following regressors? * Do you have a similar manuscript that describes just how group analysis is implemented in FsFast?
Thank you for your time and help! Gabriel