thanks for the nice words – it was all Chen Yao though..
There is a button in Lead-Group, called something like prepare DBS stats.
That would create overlap VTA/STN of the selected atlas.
You can then correlate a variable with that – in theory directly from within Lead group. It’s not very intuitive, best documentation are these slides: http://www.lead-dbs.org/docs/tutorials/group_analyses_horn.pdf