Actually, I was wondering more about what exactly the metric of comparison is when one conducts a 2nd level analysis in the "spatial components" tab.  For instance, let's say I was interested in simple regression of a variable [between-subjects contrast; 01] to change between conditions (follow-up > baseline) and selected "group-ICA_3" and "group_ICA_10" (i.e., DMN network components) in the ICA network section and set those as [10;01] in the between-measures contrast section.  What is this exactly comparing within the two ICA networks?  ICC? 

Jeff