[FieldTrip] plotting open brain on source level

Schoffelen, J.M. (Jan Mathijs) janmathijs.schoffelen at donders.ru.nl
Thu Aug 11 15:19:06 CEST 2022

Hi Philip,

Yes you can, but not out of the box.

If your beamformer has been computed on a 3D grid, you could use ft_sourceplot with cfg.method = ’surface’ with an appropriate cfg.surffile (which should be in register with your volumetric data), and an appropriate corresponding (and creative) cfg.surfinflated. 

Under the hood ft_sourceplot will first interpolate the functional data onto the surface mesh defined by cfg.surffile, and then render the mesh that is in cfg.surfinflated.

The meshes defined in the surffile/surfinflated pair should be topologically identical, i.e. they should have the same triangulation, but the vertex location of the surfinflated can be placed wherever you want them. Typically, the vertices reflect an inflated cortex, but in your case you could generate a file that have the left and right hemispheres separated such that you can see the medial surface. Such a file does not exist in fieldtrip, so you’d need to make one yourself.

If your beamformer has been computed on a surface constrained grid, then you could still use ft_sourceplot with cfg.method = ’surface’, but then de cfg.surffile/cfg.surfinflated pair will not work. In that case you’d need to directly replace the source.pos of the source-object that you try to visualize, by a set of positions that describe similarly creative transformations of the hemispheres as alluded to in the previous paragraph.

Sounds like a fun exercise to me!

Best wishes,

> On 11 Aug 2022, at 11:49, philip Joadavi via fieldtrip <fieldtrip at science.ru.nl> wrote:
> Dear all,
> I want to plot my beamforming results similar to the figure below, with both the medial and lateral sides of each hemisphere.
> I would appreciate it if you could let me know if I can plot it using FieldTrip.
> <image.png>
> Best,
> Philip
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