Hi Yan, This is why we prefer people use NIFTI volumes, rather than old Analyze .hdr/.img pairs. The latter do not specify orientation, which in the case of SPM2 volumes depends on one of your settings. It sounds like your setting wrote volumes right-on-left, rather than left-on-left, which is what Caret assumes. There are a couple of work-arounds:
* Write your volume out as NIFTI and map the NIFTI volume (recommended). * Use File: Open Data File: Volume Functional File and indicate that the volume is right-on-left. Then, instead of mapping volume from disk, map volume from Caret (or loaded volume). Today is a Wash U holiday, so we're all at home until Monday. Donna > Dear caret experts! > > Happy New Year! > > I am trying to map a functional volume to a surface via Munu*: Attributes: > Map Volume(s) to Surface(s)*. > > I chose *Map to Caret With Atlas* with the following options: Space: > *SPM2*; > Atlas: *PALS_B12 Multi-Fid Map LEFT hemisphere (73730 nodes), SPM2 space* > > This means the functional volume will be mapped to the left hemisphere > surface. > > However, when I see the results, I can see activations on the right > hemisphere. > [Page Selection: *Overlay/Underlay - Surface*: *Primary Overlay: Metric*: > MFM LEFT - SPM_T_0001.hdr]. I clicked on Toollbar: *Model*: *FIDUCIAL > Human. > PALS_B12.RIGHT_AVG_B1-12.FIDUCIAL_SPM2.clean.73730.coord* to see if there > is > any activation on the right hemisphere. Surprisingly, I see the activation > on the right hemisphere! > > Why the activation appears on the right hemisphere even I just mapped the > volume to the left hemisphere surface? [*PALS_B12 Multi-Fid Map LEFT > hemisphere (73730 nodes), SPM2 space]* Must I just ignore the activation > on > the right hemisphere? Thank you very much! > > Best wishes! > > Yours Sincerely, > YAN Chao-Gan > > -- > YAN Chao-Gan, Ph.D. Candidate > State Key Laboratory of Cognitive Neuroscience and Learning > Beijing Normal University > Beijing, China, 100875 > Phone: +86-10-58801023 > [email protected] > http://www.restfmri.net/forum/yanchaogan > _______________________________________________ > caret-users mailing list > [email protected] > http://brainvis.wustl.edu/mailman/listinfo/caret-users > _______________________________________________ caret-users mailing list [email protected] http://brainvis.wustl.edu/mailman/listinfo/caret-users
