Hello Alfonso and everyone,
 
I was recently looking online at some PowerPoint slides that Dr. Whitfield-Gabrieli had written.  In the slides. it was suggested that one could select two sources simultaneously from the Sources column to "aggregate or compare the connectivity results across several ROIs (e.g. to compare the connectivity between LLP & RLP select both sources and enter [1,-1] in the 'between-sources contrast' field)".  (p. 47 of attached file)
 
If I wanted to aggregate right and left BA 46, for example, I would select both, but I'm not sure what the weights would be.  Would they be be .5 and .5?
 
Thanks for any help, (and thanks for all of the great help you have already provided for this great program!)
Mary