[Freesurfer] Load Brodmann surface area into inflated surface

Hi all,

I'm sorry if these questions have already been covered here, but I've looked into the archives and still can't do what I need (and since I'm running out of time for this task I decided to post here):

I'm using version 5.0.0.

I want to show the resulting Brodmann area (only 3 BA) volume in the inflated surface of my subjects to show the differences between patients and controls (for visualization purpose only). I've managed to overlay the volume in the curvature menu but this is for the entire cortex and I can't show the values bar. How can I show the volume of only 3 BAs and have the scale bar?

Another question is, how is the volume of the BA calculated? Is it from the surface-based stream?

And, which surface area is the on in the output of the BA stats? Is it the pial or wm?

Thanks in advance, Andreia