source coherence in one condition

[Andrew Smart]

Hi,
I would like to try to compute whether there is significant coherence across
subjects but within one condition and between two dipoles. This code
generates graphs but I am unclear about what they mean:

for i = 1 : length(the_sources) %this is coherence between pairs of BESA      
                                 %dipoles, imported *.tfc files
    cfg = [];
    cfg.keepindividual = 'yes';
    cfg.cohrefchannel= 'M100';   %I would like to test coherence between  
                                 % this dipole and the other dipoles in the 
                                 % BESA model on a group level
    cfg.channel = the_sources{i};
    cfg.parameter = 'cohspctrm';
    cfg.method = 'montecarlo';
    cfg.neighbours    = [];
    cfg.time          = 'all';
    cfg.freq        = 'all';
    cfg.avgovertime      = 'no';
    cfg.avgoverfreq      = 'no';
    cfg.avgoverchan      = 'no';
    cfg.computeprob      = 'yes';
    cfg.computecritval   = 'yes';
    cfg.statistic        = 'indepsamplesregrT' ; %only stat test that works
    cfg.correctm         = 'max';
    cfg.numrandomization = 500;
     cfg.design           = [ 1 2 3 4 5 6 7 8 9 10      %is this correct?
                              1 1 1 1 1 1 1 1 1 1 ] ;   %i have 10 subjects
           
     cfg.uvar = 1;                                       %one condition
     cfg.ivar = 1; 
     cfg.wvar = 1;                                                    
                                                                     

    Prepstat = freqstatistics(cfg, Prepgram{:});
    
    cfg = [];
    cfg.xparam       =  'time';
    cfg.yparam        = 'freq';
    cfg.zparam        = 'stat';    %what are the values in this field?
    cfg.zlim          = 'absmax';

    figure; singleplotTFR(cfg,Prepstat(:));
    title([the_sources{i} '_coherence']);
    colormap jet
end

Do you have any suggestions for improving this and making the results more
interpretable? (what do the results mean?) Are there other available
statistical tests in Fieldtrip, for example is 'indepsamplesZcoh' implemented?

Thanks,
andy

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