[FieldTrip] Creating volume conduction model and leadfieldmatrix using .elp (jan-mathijs schoffelen)

[Robert Oostenveld]

Dear Brian

I suggest you look at 
http://fieldtrip.fcdonders.nl/faq/how_are_electrodes_magnetometers_or_gradiometers_described
to convert your electrode positions to fieldtrip format and
http://fieldtrip.fcdonders.nl/faq/is_it_important_to_have_accurate_measurements_of_electrode_locations_for_eeg_source_reconstruction
and the other faqs for more background information.

 Furthermore, you can use the standard BEM volume conduction model that is available from the FTP server and spatially coresister your electrodes with the standard BEM geometry using ft_electroderealign or another method of your choise. Following that, I suggest you do some forward simulations (ft_dipolesimulation) and visualise the scalp topographies to check that they make sense prior to moving to the inverse source estimatione (ft_sourceanalysis or ft_dipolefitting).

best regards,
Robert




On 10 Oct 2011, at 11:45, <B.Mouthaan at neuro.umcn.nl> <B.Mouthaan at neuro.umcn.nl> wrote:

> Hello Jan-Mathijs,
> 
> My elec file is a struct, containing a 32x3 double called 'label'. I think these contain the coordinates. Also it contains two 32x1 cells. Called 'textdata' and 'rowheaders'. They contain the same info (names of the 31 channels + average):
> 
> 'CP2'
> 'CP5'
> 'CP6'
> 'Cz'
> 'F3'
> 'F4'
> 'F7'
> 'F8'
> 'FC1'
> 'FC2'
> 'FC5'
> 'FC6'
> 'Fp1'
> 'Fp2'
> 'FT10'
> 'FT9'
> 'Fz'
> 'O1'
> 'O2'
> 'P3'
> 'P4'
> 'P7'
> 'P8'
> 'PO3'
> 'PO4'
> 'Pz'
> 'T7'
> 'T8'
> 'Avg'
> 
> I hope this is enough info for you, to help me with the solution
> 
> Best,
> 
> Brian
> 
> 
> 
> 
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