The relation between Scouts and brain grid

Francois · June 25, 2020, 7:19am

is it the location of the center of scout? am I right?

It should be OK.
If you are using a surface source model with constrained orientations, use preferably the Vertices field from the surface file.

but the dimension of these arrays aren't match! how can I do that?

The GridLoc field contains the 3D locations.
The Gain matrix defines 3 dipoles in orthogonal directions at each location, so it has 3x the size of GridLoc.
https://neuroimage.usc.edu/brainstorm/Tutorials/HeadModel#On_the_hard_drive

Simulating EEG signal from Leadfield+source signal is done in bst_simulation.m:

github.com

brainstorm-tools/brainstorm3/blob/master/toolbox/math/bst_simulation.m

function newDataFile = bst_simulation(ResultsFile, iVertices, Comment, isVolumeAtlas)
% BST_SIMULATION:  Create a pseudo-recordings file by multiplying the forward model with the sources.
%
% USAGE:  newDataFile = bst_simulation(ResultsFile, iVertices, Comment='', isVolumeAtlas=0)
%         newDataFile = bst_simulation(ResultsFile, iVertices)  : Use only the selected vertices
%         newDataFile = bst_simulation(ResultsFile)             : Use all the vertices
%
% INPUT:
%     - ResultsFile : Full or relative path to a brainstorm sources file
%     - iVertices   : Indices of the sources to use to simulate the recordings
%     - Comment     : Comment inserted in the created file
% OUTPUT:
%     - newDataFile : Full path to the simulated recordings file created and saved in the database

% @=============================================================================
% This function is part of the Brainstorm software:
% https://neuroimage.usc.edu/brainstorm
% 
% Copyright (c) University of Southern California & McGill University
% This software is distributed under the terms of the GNU General Public License

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