fourierspectra and freqstatistics

jan-mathijs schoffelen j.schoffelen at PSY.GLA.AC.UK
Wed Aug 5 10:50:18 CEST 2009

Dear Jasper,

> Can I input these fourier spectra directly to freqstatistics or
> should I convert the fourierspectrum first to a powerspectrum (I
> assume this could be done by taking abs(fourierspectrum).^2 and
> then averaging over tapers for every trial ) ?

I suspect that you cannot directly put fourierspectra  into
freqstatistics when you want to perform a T-test on the power. I
always throw the frequency data at freqdescriptives (with
cfg.keeptrials = 'yes'); this should give you single trial power
spectra. Then you can use the 'montecarlo' or 'analytic' method for
statistical inference. You can indeed also compute the variance in
freqdescriptives, but I am not sure how to get to a T-value using
fieldtrip there. At least you won't get there using the 'statfuns'.



The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also and
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the fieldtrip mailing list