[FieldTrip] phase distribution

[Rodrigo Montefusco]

Hi Marcel,
Have you tried by using the Hilbert transform present already in matlab,
and extract the "angle" from it. something like x= angle(hilbert(data)); I
think should work.
Consider using a good filter that don't introduce any artifact to your data.

If there are better suggestions, please let us know.

Best

Rodrigo

On Fri, Dec 16, 2016 at 9:13 AM, Bastiaansen, Marcel <Bastiaansen4.M at nhtv.nl
> wrote:

> 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.
>
>
>
>
>
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