Resolution: Won't Fix
Affects Version/s: None
Fix Version/s: None
Currently, the corpus callosum is part of the surface and considered as grey matter, which means simulations are also performed on it.
The corpus callosum is identified a s a separate region for the region mapping to have the length of the number of vertices.
For the long range connectivity, the corpus callosum can be artificially uncouple by setting the coupling to 0.
For surface simulations however, the local connectivity is not set to 0.
The long-term solution includes:
+ handling the geodesic distance, so the vertices of the medial wall are far and thus the local connectivity kernel falls to 0.
+ masking the activity of those vertices.
+ choosing between asking users to add the 'fake' regions into their connectivity so len(unique(region_mapping)) == number of nodes in the connectivity; or, handling it at configuration time.