show "inflated brain" for connectivity map (from jeff)

[xgui3783]

Ping jeff to clarify

messaged jeff on 27/01/2022

[xgui3783]

from jeff:

Hello Xiaoyun, I do not remember the context in which I provided this suggestion, or what you call exactly a connectivity map, but the point is rather simple, and hold for any information projected on the cortical surface, including the Julich Brain. Because of folding, it is not possible to visualize the complete cortical surface (of course here I mean one side of the cortical surface). Since 2/3 of the cortex is in the folds, some information is hidden, even when you deal with the white matter surface, where the folds are opened. Therefore, the trick used in freesurfer is to inflate the mesh, to unfold the cortical surface, at least partially, so that you have less or no hidden areas.

Some people like David Van Essen push even further. They cut the cortical surface so that after the inflation they can also map it on a 2D plane. This is something often done my the team ov Win VanduFell for Macaques.

I attach so images to illustrate the process.

Practically, for the EbrainsViewers, it is not that difficult to deal with these 2 representations, because they can rely on exactly the same mesh, but the vertices have different coordinates.

best Jeff

[xgui3783]

Judging from his response, I wonder if this has already been achieved, since (with the assistance from Jeff, Denis & Yann), Julich brain has been projected to fsaverage space and displayed in the viewer (with assistance form Casey).

[xgui3783]

fixed

from fsaverage -> inflated projection -> show connectivity