You can use mri_coreg to register the volume to fsaverage, then use the registration when running freeview or tksurfer

Thank you Bruce. What if the nifti volume has not been processed at all in Freesurfer? My only aim is to illustrate an overlay on FSAVERAGE, with the obvious caveat of skipping surface construction for this nifti. 

Thanks,

James

On Tue, May 9, 2017 at 2:42 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:

if the nifti volume is from an individual subject that has been run through recon-all (e.g. an fmri map):

1. Use bbregister to register the fmri to the recon surfaces
2. Use mri_volsurf to sample the fmri data onto the surface
3. Use mri_surf2surf to map from the individual to fsaverage

cheers
Bruce

On Tue, 9 May 2017, james pardon wrote:

Dear All,
Apologies in advance for the naive question. Could you please  let me know
what is the best way of transferring a nifti overlay volume to fsaverage,
solely for illustration purposes? I think I should start by registering with
fsaverage volume and then overlay with Freeview, but I'm not sure what tools
from Freesurfer I should use for 1) between subject volume registration
(nifti volume to fsaverage volume) 2) fsaverage volume to fsaverage surface.

Thank you,
James

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