Dear Freesurfer users -- I'm trying to display a SPM t map (i.e., normalized in SPM8 standard template) in freesurfer inflated surface for paper figure.
So, once projecting the SPM t maps into freesurfer template (e.g., rh.inflated), I'm wondering how I can best find out freesurfer's threshold that matches the original threshold (e.g., t>4 in SPM8) given that the values in every voxel were interpolated to a different value across neighboring vertices during surface reconstruction (e.g., 4 in one voxel is mapped onto 3.92 or 4.1). Is there any rule of thumb to figure out a corresponding value between 3D (voxel) and 2D (vertex)? I'm sure that I'm not the only one dealing with this problem and sharing any of your wisdom will be greatly appreciated. -ysl
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