[FieldTrip] dipole modeling using field trip

Stephanie Kathleen Ries-cornou stephanie.ries at berkeley.edu
Mon May 20 06:32:49 CEST 2013


I would like to know if it possible to reject horizontal eye movements from
scalp EEG signal using equivalent dipole modeling in Fieldtrip. I have
tried doing this using ICA but it was not possible to identify a component
reflecting saccades for all subjects. Has anyone ever done this? If yes,
any suggestion would be great!

I am trying to learn about source reconstruction using two dipoles thinking
this might be a good start and have started going through the tutorial. I
got the following error messages:

>> data = ft_dipolesimulation(cfg);
using headmodel specified in the configuration
using gradiometers specified in the configuration
computing simulated data
Error using  .*
Matrix dimensions must agree.

Error in ft_dipolesimulation (line 203)
    simulated.trial{trial}  = simulated.trial{trial} + lf(:,i:3:end) * ...

This was fixed when I removed the "..." but then I got this message:

Error using ft_fetch_vol (line 76)
no headmodel specified

Error in prepare_headmodel (line 51)
vol = ft_fetch_vol(cfg, data);

Error in ft_dipolesimulation (line 106)
[vol, sens, cfg] = prepare_headmodel(cfg, []);

The "vol" parameter is defined, so I do not know where the error is coming



Stephanie Ries, PhD
Knight Lab - Helen Wills Neuroscience Institute
University of California at Berkeley
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