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I want to overlay the .mgh file which is the output of mris_preproc in freeview on the fsaverage surface. This file has (according to mri_info) the dimensions Nverteces x 1 x 1 x Nsubjects: my data in fsaverage space for each of my subjects. But when I load it in freeview I can only see one value in each vertex. Is there a way to view "4D" (it's actually 2D: Nverteces x Nsubjects) data in Freeview? If not, what is the single value (per vertex) that freeview chooses to show me? is it just the data from the first subject? I tried to look in the documentation for any clues about viewing time-series data in Freeview, but failed. I would also be very happy to understand what is the best way to save this 4D .mgh file in a format that I can then import it into Matlab. Thanks for the help!
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