Phase of spontaneous activity

Eric Maris maris at NICI.RU.NL
Thu May 11 12:20:03 CEST 2006

Dear Vladimir,

> I have several subjects, each with two sets of trials with ongoing EEG
> (i.e.
> not containing response to a stimulus). What I would like to know is
> whether
> there is a difference between these sets in terms of spectra. I'd like to
> test all the electrodes and frequencies. There is no problem to do this
> for
> power using Fieldtrip and clusterrandanalysis. But now I would like to
> find
> out whether for any electrode/frequency there is the systematic difference
> in phase between the two sets. I would even settle for testing whether in
> one of the sets the phase at some electrode/frequency is not random.
> How does one do it in Fieldtrip? Any ideas and code samples would be
> appreciated.

At this moment, this is not possible in Fieldtrip. However, it is
straightforward to implement it. As you know, we are in the process of
restructuring the nonparametric statistics functions in Fieldtrip. I will
put your request in our ToDo-list.


Eric Maris

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