Hi Tommi,
there is no corresponding 3D volume for the surface averages. You could look at the talairach average, or you could see if Doug has finished the tools for building volume averages from the nonlinear volume morph.
cheers, Bruce
On Wed, 21 Jun 2006 raij@nmr.mgh.harvard.edu wrote:
Hi FreeSurfers,
A small group analysis question of fMRI data (fixed effects). The target brain is "fsaverage".
I have resampled and averaged the stat maps across subjects in _spherical_ space using func2sph-sess / sphsmooth-sess / isxavg-fe-sess / stxgrinder-sess. Viewing the results on a "fsaverage" surface with tksurfer works fine, thanks.
Now I would like to also view the mean functional maps in 3D space (tkmedit) on the "fsaverage" brain. This does not seem to work - obviously because the results were calculated in spherical space and were never resampled back to 3D space.
Is there a way to resample the group average from sperical space to 3D space so that it could be viewed in tkmedit? Or is the only way to achieve something like this to recalculate the analyses entirely in Talairach space without using the spherical space?
To make the results actually comparable between 3D (tkmedit) and surface-based (tksurfer) viewing, I think I should use the same type of space for intersubject averaging - preferably spherical in both cases.
Hence, if a tool such as sph2func-sess exists (could not find it in the wiki), or there is a workaround, any suggestions would be very much welcome.
Thanks,
Tommi
Tommi Raij, M.D., Ph.D. MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging Bldg 149, 13th St Charlestown, MA 02129 U.S.A.
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