[FieldTrip] Tranform MNE to dSPM

[Miguel Granja Espirito Santo]

Hello all,

I am currently trying to transform my source-localized MNE individual data into dSPM before conducting group stats. However, I am stuck in the last step. Unfortunately, I am not very good with maths, so I can't replicated Dale et al. (2000) formulas. I had look through previous posts (namely, https://mailman.science.ru.nl/pipermail/fieldtrip/2012-May/005170.html) , and information is a bit vague on how to replicate this process. Does anyone have any information about how to proceed from MNE to dSPM. I currently have the code below ( as per the MNE tutorial) and would appreciate any advice on what to do next:

 %% prepare leadfield

cfg = [];

cfg.grid.unit = 'mm';

cfg.vol  = vol;

cfg.grad = grad;

cgf.reducerank = 2;

cfg.normalize = 'yes';

cfg.grid = sourcespace;

leadfield = ft_prepare_leadfield(cfg);

%% Inverse Solution

 cfg        = [];

cfg.method = 'mne';

cfg.grid   = leadfield;

cfg.vol    = vol;

cfg.mne.normalize = 'yes';

cfg.mne.prewhiten = 'yes';

cfg.mne.keepfilter= 'yes';

cfg.mne.lambda    = 3;

cfg.mne.scalesourcecov = 'yes';

cfg.mne.projectnoise = 'yes';

cfg.mne.keepfilter = 'yes';

mne_hands_Distorted  = ft_sourceanalysis(cfg,tl_DistHands);

mne_hands_Standard  = ft_sourceanalysis(cfg,tl_StdHands);

  %% Plot Results

bnd.pnt = sourcespace.pos;

bnd.tri = sourcespace.tri;

cfg = [];

cfg.projectmom = 'yes';

shDist = ft_sourcedescriptives(cfg,mne_hands_Distorted);

m=shDist.avg.pow(:,700); % Plotting around 170ms

ft_plot_mesh(bnd,'edgecolor', 'k', 'vertexcolor', m);


Thanks for your help.
Best,
Miguel
PhD Student
School of Psychology
University of Nottingham





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