Hi Christine,

Sorry if I was not clear about posting the response.

Given what you are doing, it sounds like the advantage
of ACPC space is to get the brains mostly aligned for
voxel selection could even be had in standard space.
So both ORIG and TLRC views are viable alternatives.

But if that seems daunting, it is feasible to extract the
coordinates of each electrode, and warp the coordinates
to standard space. Normally that would be trivial, but
cat_matvec does not work on 12-piece transformations.
Daniel described how whereami could do such a thing,
but that would require you do define the ACPC dataset
spaces in a NIML text file (like AFNI_atlas_spaces.niml
in your abin directory).

There is also the option of using 3dfractionize/adwarp,
but the 2 resample steps makes it less precise. Maybe
there are ways to make that pretty accurate though.

I guess changing adwarp is a possibility, but that might
be more difficult.

So one main question for you is, how much work would
it be to shift to orig or tlrc spaces?

- rick