= Simulations =
''Author: Francois Tadel''

This tutorial addresses everything that can be called "simulation" in Brainstorm: simulation of simple signals, simulation of full source maps from a few scouts, simulation of MEG/EEG recordings from source maps (real or synthetic). Its goal is to group all the information that was previously spread across multiple tutorials and forum posts, and difficult to access.

<<TableOfContents(2,2)>>

== Simulate signals ==
You have no data in your database. Some process in the '''Simulate''' menu can generate signals and save them as new files in the database. Because you start from nothing, the Process1 list needs to be empty. Click on Run and try the following processes.

=== Simulate generic signals ===
This process allows to define a set of signals with Matlab code and save it in a Brainstorm file. Another example is available in the tutorial [[https://neuroimage.usc.edu/brainstorm/Tutorials/TimeFrequency#Simulation|Time-frequency]].

=== Simulate PAC signals ===
This process generates synthesized data containing cross-frequency phase-amplitude coupling. It is fully documented in the tutorial [[https://neuroimage.usc.edu/brainstorm/Tutorials/TutPac#Simulate_signals|Phase-amplitude coupling: Method]].

{{attachment:simulate_pac.gif}}



== Generate full source maps from scout signals ==
== Simulate MEG/EEG recordings from real sources ==
== Simulate MEG/EEG recordings from simulated dipoles ==
These examples are based on the introduction tutorials, but can easily be transposed to any study. The inputs you need to provide to the process depend on the type of orientation constrains

=== Constrained ===
=== Unconstrained ===
https://neuroimage.usc.edu/brainstorm/Tutorials/TutVolSource#Volume_scouts

== Additional documentation ==
A great simulation article was published by Prof. Debener's neuropsychology lab in Oldenburg. It uses Brainstorm to evaluate and improve the design of ear-EEG devices. All the Matlab/Brainstorm scripts used in this study are available on [[https://figshare.com/articles/software/Matlab-code_for_simulation_of_dipole_sources/11907801|figshare]], together with some videos illustrating the simulations that were done.

Meiser A, Tadel F, Debener S, Bleichner MG<<BR>>[[https://link.springer.com/article/10.1007/s10548-020-00793-2|The Sensitivity of Ear-EEG: Evaluating the Source-Sensor Relationship Using Forward Modeling]]<<BR>>'''Brain Topography''', Aug 2020

{{attachment:meiser.gif}}