synthetic sources with mne.simulation.SourceSimulator

💬 Support & Discussions
1

I’m creating synthetic sources with source_simulator = mne.simulation.SourceSimulator(src, tstep=dt, duration=T).
The signals are added via

source_simulator.add_data(label, signal, events)

where signal is a scalar time array. What is the direction of current dipole moment in this case? Can I specify exact direction with 3D vector input?

All the best,
Tomasz

2

That’s quite important question regarding synthetic sources. Maybe developers may help?

3

the orientation is coming from the normal to the cortex as specified in the src object.

hope this helps

Alex

1 Like
4

Thank you Alex!

Where can I find the direction of the normal to the cortex surface? Can it be read from src?

Is there a way to create synthetic sources with arbitrary directions of dipoles?

All the best,
Tomasz

5

Dear Tomasz!

The complete documentation for the src object can be found here: mne.SourceSpaces — MNE 1.4.2 documentation

You can access the array of locations and directions from the object as: src[hemi]["rr"] for locations and src[hemi]["nn"] for surface normals.

Note that hemi can be 0 (left hemisphere) or 1(right hemisphere), this is correct only for surface source space.

Hope this helps.
Urban

2 Likes
6

Dear Urban,
thank you, this solved the problem. I hope I can also modify SourceSimulator to obtain arbitrary direction of current dipoles.

All the best,
Tomasz