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Dear Elisa, The PDC formula implelemted in SPM was given to Will Penny by Luiz Baccala himself while he was visiting here. If I remember correctly it was an improved formula that he was about to present at a conference at the time which might explain the difference. We'll look into it and try to either find a reference or correct the formula if there is indeed a mistake. Best, Vladimir On Tue, Jul 7, 2009 at 5:42 PM, Elisa Visani<[log in to unmask]> wrote: > Dear SPM group, > I'm newcomer in SPM world because usually I work on EEG signal. > Since few months, we've started to co-register EEg and fMRI. > I'm trying to use the toolbox 'Spectral', but maybe I found an error in > spm_mar_spectra.m file. > In the PDC formula a normalization is performed as Baccalà suggest, but the > term of variance is used only in the denominator and not in numerator. > Regards > Elisa >