Hi Emanuele,

Well, that functionality is not exactly there yet, if in the 'Results' tab you select your subset of ROIs in the 'sources' list and enter the contrast [1 1 ... 1]/n (where n is the number of ROIs), that will test the average connectivity between your selected ROIs and each of the other ROIs, which is related to but not exactly what you want (if I am understanding correctly).

In any way, since this was an interesting suggestion I am attaching a little function that will allow you to perform tests on the average connectivity within- and between two subsets/networks of ROIs. To run this you need to have your conn project open, then go to the 'Second-level Results' tab and define there the particular test that you want to run (any desired combination of between-subject and between-condition effects, like you would do for a normal ROI-to-ROI analysis). Once you do this you may call the attached function conn_withinbetweenROItest, it will prompt you to select two sets of ROIs and it will then perform the chosen analyses but averaging first the connectivity values within- each network of ROIs (within-network analyses), and also averaging first the connectivity values between- the two networks of ROIs (between-network analyses). Let me know if you would like me to clarify this functionality.

Hope this helps
Alfonso
Originally posted by Emanuele Pravata':