Hi Marco,
Let's make sure you're doing what we are expecting you to do, since
there is no tutorial yet for Map to Individual:
* On the Map fMRI to Surface dialog, select the volume as you specified
below.
* Select Map to Individual.
* Press the Parameters button.
* Press the Params button on the Individual Parameters dialog.
* Load the appropriate .params file for the right hemisphere (i.e., the
one that is named closest to your surface name, or rather the intensity
volume from which it was generated); its filename should appear in your
spec file, but the mapper does not load it automatically.
* Then select the fiducial vtk file under the Mapping Surface Selection.
Is this what you did?
Donna
marco tettamanti wrote:
Dear Caret authors,
I am sorry to come up with new questions.
I am experiencing some problems in Mapping fMRI data onto RIGHT hemispheric
surfaces (not on the atlas, but on my own generated average dataset).
In the Map fMRI to Surface dialogue window, I select my own fMRI dataset and
specify Analyze volume type and Left-Posterior-Inferior orientation.
I then select the Map to Individual option.
Choosing Negative X - Left (Anatomical) (i.e. the orientation of average
structural image) in the Individual parameters dialogue window, produces some
unexpected results: the left hemispheric activations, rather than the right
hemispheric ones, are mapped onto the right hemispheric surface.
Why is that?
Appearently, choosing Negative X - Right (Radiological) in the Individual
parameters dialogue window, solves the problem, i.e. the right hemispheric
activations are mapped onto the right hemispheric surface. However, only some
of the expected foci light up (I was expecting - e.g. based on the SPM maps -
to see a focus in the inferior frontal gyrus, but it is not there; and other
foci are also not there).
Using the SAME fMRI data files for Mapping onto the left hemispheric surface
(derived from the SAME average structural image) does not produce such
problems. Choosing Negative X - Left (Anatomical) in the Individual
parameters dialogue window, has the expected effect of mapping left
hemispheric foci onto the left hemisphere.
Just as a control, I have then mapped the right hemispheric activations onto
the left hemisphere (by choosing Negative X - Right (Radiological) in the
Individual parameters dialogue window). When I do this, all expected foci
(included the one in the inferior frontal gyrus) light up.
I am aware that this doesn't mean much; the difference may be due to an
asymmetry between the right and the left hemisphere.
But I do not see such a big asymmetry, and I just wanted to be sure that there
is not something wrong with the way I am using the mapping procedure.
Thanks for your help as always!
Marco
