Hello,
Computing the scout time series using the "max" option in the processes "Extract scout time series" or "Extract values" cannot work because they don't keep the coordinates of the maximum vertices (and if you had multiple time points, it would select probably a different vertex at each time point).
In the Scout tab, you can select all your scouts use the menu Sources > Maximal value (selected scout). It modifies the existing scouts and keep only the vertex with the highest value. Then right-click on the figure > Get coordinates, and select the point where the scout was created. It will give you the coordinates in MRI, SCS and MNI coordinate systems.
Otherwise, you can do it all manually:
- Export the source maps to Matlab (http://neuroimage.usc.edu/brainstorm/Tutorials/Scripting#Custom_processing) => sSources
- Export the scouts to Matlab (from the Scout tab: menu Scouts > Export, http://neuroimage.usc.edu/brainstorm/Tutorials/Scouts#On_the_hard_drive) => s1
- Export the cortex surface to Matlab (from the database explorer, right-click on the surface > File > Export to Matlab, http://neuroimage.usc.edu/brainstorm/Tutorials/ExploreAnatomy#On_the_hard_drive:_Surface) => sSurface
- Find the vertices with the highest values within scout s1: [valMax, iMax] = max(sSources.ImageGridAmp(s1.Vertices,1));
- Get the SCS coordinates of this vertex: sSurface.Vertices(s1.Vertices(iMax), : )
- To convert to different coordinate systems: http://neuroimage.usc.edu/brainstorm/CoordinateSystems#Converting_between_coordinate_systems
Francois