By default, mri_glmfit will exclude any voxels where there is even a single data point that is 0. It looks like all your voxels fall into that category. If this is really ok and you want to analyze voxels where some data points are 0, then add --no-prune.

        

Hello FreeSurfer Developers,

I'm attempting to do a Surface-based analysis on Freesurfer while projecting MTR MRI sequences.

I have followed all the steps explained in the group analysis tutorials, and the mri_preproc seems to have ran correctly but once the mri_glmfit is launched i get the following error :

Computing normalized matrix
Normalized matrix condition is 38.1502
Matrix condition is 1.78431e+12
Found 149926 points in label.
Pruning voxels by thr: 1.175494e-38
Found 0 voxels in mask
ERROR: no voxels found in the mask
  make sure at least one voxel has a non-zero value for each input

I've searched the list but didn't find an answer. Does anyone have any clue on how to solve this problem ?

Thank you very much for your help,

Marine

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