Best fitting sphere estimation

The forward method you selected uses a spherical approximation of the head. The window Edit best fitting sphere will help you define this sphere.
Edit best fitting sphere window
The objective to get a sphere that is as close as possible to the shape of the head, particularly in the regions you are studying. 


Reload the previous sphere.
Automatic estimations of the sphere; each one is based on a different set of point (eg. scalp vertices, cortex vertices, EEG electrodes...).
Select the best estimation, then adjust it manually if necessary.
Graphically edit the sphere: translation along each axis, and resize.
1) Select one of these buttons
2) Right-click anywhere in the figure and hold the button
3) Move the mouse up or down

Edit the sphere properties manually: center and radius.
For multiple spheres models (EEG only), also edit:
- the conductivity of each shell,
- the radii of the other spheres (relative to the scalp sphere)

Click on this button when you are done, to start the forward model computation.

More information about head models: Brainstorm website.