[FieldTrip] Instantaneous phase angles/ baseline adjust for resting alpha activity

[Johanna Zumer]

Dear Emilio,

For (1), you can also call ft_preprocessing on raw data, with
cfg.hilbert='angle' to get the instantaneous angle from the Hilbert
transform.  (and appropriate filter settings so that it's filtered into
your frequency of interest first).

For (2), does ft_freqbaseline answer your question?

Cheers,
Johanna


2013/4/6 Emilio Valadez <evaladez at psych.udel.edu>

> Dear FieldTrippers,****
>
> ** **
>
> I have two independent questions that I hope are relatively simple:****
>
> ** **
>
> **1)      **How can one obtain the instantaneous phase angles for
> time-frequency data? I believe one workaround method to achieve this would
> be to use ft_freqanalysis on the raw data with cfg.output = ‘fourier’ to
> return the complex Fourier transform,  and then use MATLAB’s “angle”
> function on the complex output to compute the phase angles. But is there a
> more direct way to get the phase angles from FieldTrip?****
>
> ** **
>
> **2)      **Can FieldTrip be used to make a baseline adjustment for
> resting alpha-band activity or average alpha activity in time-frequency
> data? And if so, how?****
>
> ** **
>
> Thanks very much for your help, in advance.****
>
> ** **
>
> All the best,****
>
> Emilio****
>
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