If you want to do a conjunction, you can run mri_concat with the --conjunct option (see --help for more details). If you want to look at simple overlap, you can threshold each sig map (mri_binarize), then combine them together something like

fscalc map2.bin.nii.gz mul 2 add map1.bin.nii.gz -o overlap.nii.gz

overlap will be

1 for map1 only

2 for map2 only

3 for both

On 11/30/2017 01:46 PM, Rizvi, Batool wrote:

Hi – I’m still wondering what would be the best method to perform the mentioned steps. Additionally, would mri_compute_overlap provide output related to spatial overlap and difference, that we’re looking for? Is it possible to do this with thickness, or maybe not – because it doesn’t consider area? Just wondering, as we only performed QDEC using thickness so far.

Thanks so much,

Batool

*From:* Rizvi, Batool *Sent:* Tuesday, November 28, 2017 3:16 PM *To:* freesurfer@nmr.mgh.harvard.edu *Subject:* QDEC and comparing two conditions

Hi FreeSurfer experts,

We calculated the correlation between thickness two different behavioral conditions using QDEC. We now want to compare the spatial overlap and difference in thickness-correlation between the two behavioral conditions. We would like to do this both visually as well as statistically. Is there an option to do this either in QDEC or in the command line?

Thanks for your time!

Batool

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