About partition tests within the same area

In doing frequency analysis in brain strom, is it possible to do a partition test within S1, such as hand resion of S1 and other S1 regions? If possible, I would like to know how to do it.

You can create your own Scouts (regions of interest) as shown in here:
https://neuroimage.usc.edu/brainstorm/Tutorials/Scouts#Creating_a_scout