This almost always is because the functional volume is not stereotactically 
registered to the anatomical volume used to generate the fiducial surface. Is 
this an atlas surface (e.g., one of the PALS mean midthickness surfaces), or is 
it an individual's surface reconstruction?  If atlas, this could happen if you 
were trying to map SPM functional data to the AFNI midthickness surface, for 
example, because there are noticeable differences between those stereotaxic 
spaces.

If individual, make sure the functional volume is in register with the 
anatomical volume used to generate the surface.


On Aug 10, 2015, at 1:40 AM, j...@nbrc.ac.in wrote:

> Hi,
>   when i map the functional data onto caret fiducial surface, it appears
> that the mapping is shifted in rostrocaudal axis, caudally, by about 2
> -3 mm. anyone has idea what could be possibly wrong here?
> thanks,
> john
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