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Dear Dr Greve, thank you so much. kindly have one additional question and I appreciate your response.

I would like to move a mask from MNI152 to fsaverage so I can use it as a mask in flag --mask in the command "mri_glmfit". Does this procedure reduces the power of the analysis, meaning instead of correcting the the between group analyses to the whole cortex. I would like to do it in the ROI? In my analyses I see results when I correct for whole brain cortex. I mean when I use the command:

mri_glmfit --y data.nii.gz --fsgd fsgd.dat --C c.mtx --surf fsaverage lh --cortex --glmdir dir

I really lose these results when I use an ROI as a mask in the command mri_glmfit as follows:

mri_glmfit --y data.nii.gz --fsgd fsgd.dat --C c.mtx --surf fsaverage lh --mask roi.nii --glmdir dir

Thank you gain for any clarification,

John

Don't use --regheader, use --reg $FREESURFER_HOME/average/mni152.register.dat

On 7/26/18 4:40 PM, John Anderson wrote:

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On July 26, 2018 4:40 PM, John Anderson <John.anderso@protonmail.com> wrote:

Dear Freesurfer experts,
I have mask in MNI152 space. I would like to register this mask to fsaverage. How can I do this registration. I am thinking of "mri_vol2surf" as follows:

mri_vol2surf --mov mask.nii --mni152reg --regheader fsaverage --o mask_fsaverage.nii
Is this command correct?
Thank you for your valuable guidnace
John