The relation between Scouts and brain grid

[SBeumer]

Dear Morteza,

The following two forum threads might help you a bit better in simulating the signal from the scouts:

Simulate sources using brain template and CTF-275

Hi, I would like to simulate what scalp topography I would get given a specific dipole location in the brain. In other words, assuming a given MNI coordinate, a given dipole orientation, what would the scalp topography look like? For the analysis, I would like to use (1) a brain template provided with Brainstorm and (2) for the location of the channels some sort of default for CTF 275 if anything like that exists. I’ve spent a while looking around the tutorials, but could not find much. I a…

How do i simulate EEG signals with different signals in different scouts

Different source orientations and depth have different sensitivities to EEG. Not all the regions of the cortex are visible uniformly in EEG. Read some background literature in electromagnetic source modeling if these concepts are not familiar to you. Things you can do to understand better what is going on in an experimental way: Use larger scouts for your simulations, so that for each source you have various source orientations and depth Test with different orientations and depths Add noise…

Brainstorm can obtain these electrode recordings natively so you don't have to do that via Matlab.
Indeed the scouts take vertices of the parcellated brain and when a signal is imposed in a scout all the source points in that will get your simulated signal imposed on them and via the Leadfield they are propagated to the electrodes.

I hope that that answers your question

Kind regards,
Steven