The main problem here is that there could be a conflict within a voxel in that multiple contrasts could be activated. One way to solve this is to use mri_concat with the --max-index option to create a map where the value of each voxel is the index of the map with the max significance. You can then display that as a segmentation. And/or you can run mris_seg2annot to create an annotation.

doug

On Sun, 3 Jan 2010, Bruce Fischl wrote:

Hi Krishna,

Doug would know, but I don't think we have anything that will do exactly what you want. It would be pretty easy to do in matlab though, and we provide matlab i/o functions.

cheers Bruce

On Sun, 3 Jan 2010, Srihasam, Krishna wrote:

...

Hi,

I have a paradigm in which I show the subject 3 stimuli ( in block paradigm). I want to see the activation of each stimulus block and for that reason I have build three contrasts (say contrast 1 : positive stimulus 1 and negative stim 2 and stim 3; similarly contrast 2 and contrast 3). I want to overlay all the activations onto a single anatomical volume (in different colors) so that I can compare the locations of activations. Can I do it in FSFAST/Free surfer?

Regards, -K

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