[FieldTrip] phase distribution

[Bastiaansen, Marcel]

Dear Fieldtrippers,

I want to analyze data from an EEG experiment in which I split trials from one participant in two sets based on some response criterion.
I want to know how (absolute) phase at a particular point in time (say t=0) is distributed within each set of trials, and whether there is (on average) a difference in absolute phase between the two sets of trials.
I have found a matlab toolbox (circ_stats) that allows me to plot circular phase data, do tests on phase distributions, and to compare two distributions, but I would like to use Fieldtrip to extract the instantaneous phase angles (radians or degrees) from the single trials for a given point in time using multitapers (which I believe is the preferred method for this, right?).
Browsing through the Fieldtrip discussion archive, I haven't been able to find a dedicated Fieldtrip function for that, but I am sure that functions such as  ft_mtmconvol do compute absolute phase at some point...
Can anyone give me advise on how to achieve my goal?

Thanks,
Marcel.


***
Dr Marcel C.M. Bastiaansen
Lecturer and researcher in quantitative research methods
Academy for Leisure & Academy for Tourism
NHTV Breda University of Applied Sciences
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And

Department of Cognitive Neuropsychology
Tilburg School of Social and Behavioral Sciences
Tilburg University
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Email: M.C.M.Bastiaansen at uvt.nl<mailto:M.C.M.Bastiaansen at uvt.nl>

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