its not possible to do what you want in qdec. but if you're good with matlab data slinging, here is how it can be done:

goto the directory named 'Untitled' underneath your qdec dir in your subjects dir. it could be named something other than Untitled if you changed the name in the qdec design tab. look for the file 'y.mgh'. this is the raw thickness data (if you did a thickness analysis) that you are looking at in the plot. using mri_info, you will see that it consists of N number of frames where N is number of subjects, by 163342 vertices (the number of vertices in fsaverage). the subjects are ordered by what you see in the file y.fsgd. now, you can load y.mgh in matlab with load_mgh (found in freesurfer_home/matlab). so now you have the raw data in matlab, and here is where you will need to do some data slinging to gather up which subject is in which group and then plot. also you will need to index by the vertex number you found in qdec (accounting for matlabs +1 indexing).

note that this data is the raw (thickness) data. the significance data is found in the contrast directory underneath the Untitled dir, in the file sig.mgh.

n.

On Sat, 2010-10-16 at 20:36 +0100, Khalid Hamandi wrote:

(How) Can I modify the plots produced using the Ctrl click on a vertex of interest in the brain map on the qdec GUI? I have two groups, 12 subjects each, currently using the Ctrl Click I get the measure of interest on the y-axis, and my subjects along the x-axis. I would like just two abcissae - patients and controls (with means shown for each!?) on my x-axis instead? if not easily modified, where are these values found? many thanks Khalid _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer