On 03/04/2016 06:01 AM, Silas wrote:
Thanks Douglas!
1 - I have two functional files per subject (.mgh). Is it possible to insert two files per subject in mris_preproc? In my former functional analysis I haven't concatenated my data using a FSGD-file when running mris_preproc.
Are these volumes or surfaces? If volumes, get a registration matrix using bbregister, then run mri_vol2surf specifying fsaverage as the target subject. If a surface, then use mri_surf2surf.
2 - Can you calculate the difference between two functional data sets (on the fsaverage) before starting the group analysis stream? E.g. by subtracting the files?
Yes, fscalc file1.mgh sub file2.mgh -o diff.mgh
Best, Silas
From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Douglas N Greve greve@nmr.mgh.harvard.edu Sent: Thursday, March 3, 2016 6:19 PM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] How to find the difference between to different fMRI datasets?
Create a contrast between the two conditions
On 03/01/2016 01:27 AM, Silas wrote:
Dear FreeSurfer team,
Thank you for all your help so far!
I would like to visualize the difference between two fMRI data sets.
Data set1: Cortical activation during movement of a finger.
Data set2: Cortical activation during movement of a finger different from the first finger.
How can i perform this operation?
Best, Silas
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