Hi JW,
It would be interesting to try out MBA and see how it performs.
> On the MBA page, all the examples have two ROIs.
Practically the modeling approach with MBA can take a few up to 100 regions. Those two columns in the help are meant to indicate the two regions for each region pair (matrix element), not the number of regions allowed.
> have a full and symmetric matrix (z score) for these ROIs (102 x 102) for each subject
With about 100 ROIs, use the option -WCP to speed up the computation.
Gang