Hi all,
I want to use the --prv (per vertex regressors) option in mri_glmfit, but there is very little information in the Wiki and I couldn't find any relevant info in the mailing list.
I have two .mgz files, one contains the dependent variable, the other is the source of my pvr. I tried loading one column from the second file and appending it to the design matrix in Matlab for each vertex (in a loop), but it's too time consuming to be feasible. Someone tipped me about the pvr option in mri_glmfit but from the Wiki (see below) it seems I would have to load the regressors individually here as well..?
What is pvr1, pvr2 etc. in the example below? Text files? That's either going to be one very long command line or I have to use a loop here too (probably in Matlab). Is there any way to tell mri_glmfit. "for each vertex in the dependent variable file, take the corresponding vector from the pvr-file and append it to the design matrix"?
[from the WIki:]
--pvr pvr1 <--prv pvr2 ...>
Per-voxel (or vertex) regressors (PVR). Normally, the design matrix is 'global', ie, the same matrix is used at each voxel. This option allows the user to specify voxel-specific regressors to append to the design matrix. Note: the contrast matrices must include columns for these components.
Thank you!