I haven’t used the feature in a while but just tried on a small test dataset and can confirm it worked for me. I guess the problem is that you actually need to add a group connectome to the process even if you are not at all interested in connectivity. I never found the time to support the case of preparing DBS stats only for the VTA.
So please make sure that you have some valid .mat files in your lead/fibers folder. You can e.g. download the 2013 group connectome from our download page here on the site. In theory you can even install it by clicking on the group connectome button from within lead.
Then – since you’re not interested in fibers, choose the thinned out x 500 option as in my screenshot – this wont take a lot of processing time.
Make sure you have entered all stim params for each patient correctly and chosen the Mädler or Kuncel VTA model.
Then click on prep. DBS stats. It will prepare all the stats for all patients. When this is done, you should be able to access the data in the mat files as well. Or you can add a regressor into lead group and e.g. click “Correlation between Regressors and Volume Intersections / Fibercounts” in lead group directly.
I think it’s great you’re trying this, it should be done more. One day I may find some time to make lead_group a bit more robust and intuitive.. I guess it’s quite powerful with many features but that also makes it quite hard to use. Also, not all features may always be up to date for the currentmost single-subject processing features. LG used to be a personal tool for quite some time and grew with features I needed at the moment :)