Hello -

I'm working with some ecog data, and I'd like to display the results from all electrodes on a standard freesurfer brain.

I ran recon-all on each subject's T1 volume in their native space, and I then mapped each patient's CT-based electrodes to their native T1 volume using Trotta et al.'s (2017) software toolkit.

Now I would like to display the combined density of cortical electrodes on a freesurfer standard brain surface. Specifically, I tried running 3dVol2Surf based on the instructions on [openwetware.org]

3dVol2Surf
-overwrite
-spec fs/std.141.fs_both.spec
-surf_A lh.smoothwm
-sv t1_native.nii.gz
-grid_parent lh_ecog.nii.gz
-map_func mask
-oob_value 0
-out_niml lh_ecog.niml.dset

This creates a single patient's electrode dataset that I can load onto any standardized (std.141.*) surface, but I'm confused as to how to combine electrode native space coordinates/datasets from multiple patients.

Thank you for your help, and sorry if I'm missing something obvious.