Hi Alfonso, 

Thank you again for your help. Regarding your last post, I just have a couple more questions. To remind you I am using a bivariate regression to look at the relationship between four clinical variables C1 - C4 and connectivity in a group of subjects with ASD (dummy coded, as I had a control group in a previous analysis). I also have multiple seed ROIs.

I did what you said and selected 'ASD' 'C1' 'C2' 'C3' 'C4' and entered [0 1 0 0 0; 0 0 1 0 0; 0 0 0 1 0; 0 0 0 0 1] in the between subjects contrast. Then, because I have multiple ROIs, I selected them all in the between sources contrast and left the contrast as eye(N), to appropriately control for the amount of ROIs I have. 

However, this tests the effects across any of my seeds with any of the C1 - C4 variables. I am specifically interested in knowing how connectivity differs between C1 - C4, as well as specifically which ROIs are contributing to these differences. Is there another contrast I can enter to look at this?

Thank you, 

Jenna