Hi all,

I’d like to project my activation maps onto cortical surfaces and I got some questions while using different methods.

Method 1: First I initialized both AFNI and SUMA:

afni -niml & suma -spec mh_ico64_al.spec -sv subj_..._SurfVol_ss_al2exp+tlrc

I then let SUMA talk to AFNI. After setting the bold file as underlay (bold.nii) and one activation map as overlay (condition1.nii), I got projection results like: Method1

Method 2: I projected my 3D activation maps onto cortical surfaces:

3dVol2Surf -spec mh_ico64_al \
        -surf_A ico64_mh.smoothwm_al.asc -surf_B ico64_mh.pial_al.asc \
	-sv  subj_..._SurfVol_ss_al2exp+tlrc \
	-grid_parent condition1.nii -map_func ave -out_niml ....niml.dset

I then initialized SUMA

$ suma -spec mh_ico64_al.spec -sv subj_..._SurfVol_ss_al2exp+tlrc

and loaded the projected result file (.niml.dset) via surface controller, the projection results are like: Method2

I noticed that the first method generated much less activated voxels. My previous assumption was that by using these two methods, same voxels would be selected but the values might differ. I’m not quite sure why I got projections like this. Any suggestions would be greatly appreciated!

-Xixi



Edited 1 time(s). Last edit at 04/14/2015 12:55PM by Xixi Wang.