So, it looks ok in the volume (using tkmedit) but not on the surface
(using tksurfer)? Something is definitely weird. The only thing I can
think of is that the surface is not the surface of the subject you think
it is. What is your tksurfer command line? What is the subject name in
the contents of the registration file?
On 7/3/17 11:39 AM, Taylor, Johnmark wrote:
Hello,
I am running into an odd issue. In particular, I have run a GLM
analysis in _volume_ space, and I am visualizing the results both on
the surface using tksurfer, and on the volume using tkmedit. In both
cases, I am using the register.dof6.dat file to do the registration.
Oddly, when I visualize the results on the _surface_, the activation
patch falls on the medial surface of the hemisphere, in the
_precuneus_, whereas when I visualize the results on the _volume_, the
patch is in the _intraparietal sulcus_ (which is where we expect to
see this particular activation). I have made a label out of the
activation in both cases and viewed it in the other space just to make
sure that it is in fact the same activation, and it is. Any idea what
might be going on? It seems to me that it can't be an issue with the
BOLD volume --> structural volume registration, since the activations
look normal on tkmedit. It seems to me, then, that it must have to do
with the relationship between the anatomical volume and the anatomical
surface--could this be where the problem lies? Maybe an imperfect
surface reconstruction?
I've attached pictures of what I mean. The activation in question is
in the right hemisphere. On the surface it can be seen on the medial
part of the hemisphere , and in the volume it's where the red cursor
is (as I mentioned, I verified by making labels that these are in fact
the same activation).
Thank you very much,
JohnMark
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