Thank you Alfonso. it really helps!
 
Now I'm trying to estimate the average connectivity within a given network and between networks.
I'm currently doing this by manually rearranging the concatenated subjects correlation data in the first-level results (ie subjects roi-roi correlations), and then doing statistics with SPSS: but his is really time consuming....  Is there a way to obtain the average connectivity within a set of ROI in a given Group and in a given condition in conn?
 
Thank you again!
 
Best
 
Emanuele