[FieldTrip] layout file from beamformer

Herring, J.D. (Jim) j.herring at fcdonders.ru.nl
Fri May 23 10:42:58 CEST 2014

Hi Tyler,


What would you like to plot? It seems like you want to plot the spatial
weights of independent components after running ICA on your source data.
Ft_topoplotIC plots data on a 2D-layout of your sensors/electrodes, I do
not think you want this. 


It seems to me you should have a look at ft_sourceplot and add a field to
your source data structure that, for each IC, represents the weights per
gridpoint. Then you should be able to plot the IC weights in 3D (with
anatomy if you wish).






From: fieldtrip-bounces at science.ru.nl
[mailto:fieldtrip-bounces at science.ru.nl] On Behalf Of Tyler Grummett
Sent: vrijdag 23 mei 2014 10:04
To: FieldTrip discussion list
Subject: Re: [FieldTrip] layout file from beamformer


Hey Julian,


That sounds good, it would be awesome if you could give me an example.


Also though, what are the steps of using ft_prepare_layout with beamformer
data. I am away it gives you permissions, but how do you enter that into


This is only for using in trentool, otherwise I would be using your method



On 23 May 2014, at 4:40 pm, "Julian Keil" <julian.keil at gmail.com> wrote:

Dear Tyler, 


I recently had a similar problem.


I solved this by plotting the x,y,z-coordinates of all dipoles within the
BEM-Model and assign a color value depending on the power value to the
dipole markers.


In short: use ft_triplot to plot the mesh of the BEM. Then select the
.pos-field of the dipoles inside your volume and plot them with plot3.

In the plot3-step, you can assign each dipole a 'Color'-property based on
your power or stats value.


Alternatively, you can use ft_prepare_layout to get a planar projection of
your sources, but at least in my case it did not look too good.


Hope that helps, if you want to, I can send you an example of what the
plots look like.






Am 23.05.2014 um 04:10 schrieb Tyler Grummett:

Hello fieldtrippers,


I am trying to create a layout file that has the positions of the
beamformer sources.


The output of my beamformer analysis was 1400 channels and I am trying to
create a layout file with certain position which correspond to certain


For example, if I wanted to plot 30 sources and all I had were the x y z


I am hoping that this made sense, I cant quite work out what I should be
asking for. I have worked out how to plot the power of the sources, but 

ft_topoplotIC is asking for a layout file (after I ran an ICA over it),
which I cant work out how to make.






Tyler Grummett ( BBSc, BSc(Hons I))

PhD Candidate

Brain Signals Laboratory

Flinders University

Rm 5A301

Ext 66124

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