single trial/channel phase angles

[jan-mathijs schoffelen]

Hi Karl,

freqanalysis with method = 'mtmconvol' allows you to keep the fourier
coefficients (cfg.output = 'fourier') so you'll get a complex
representation there.

Best,

Jan-Mathijs


On Mar 10, 2010, at 2:36 PM, Karl Doron wrote:

> Hello,
>
> I'm looking at some MEG data and have a hypothesis about cross
> frequency
> coupling. Specifically, a relationship between lower frequency phase
> and
> higher frequency amplitudes. I'm trying to save and view the phase
> angles
> after doing wavelet analysis using wltconvol.
>
> If this is implemented -great! Otherwise, it seems that somewhere
> after line
> 216 of ft_freqanalysis_wltconvol.m (after the ifft), I should be
> able to
> save the complex numbers and use angle(input) to find the phase
> angle of
> each time point on a trial by trial basis. It seems easier to do in
> the
> 'tfr' wavelet code, but the time domain covolution is very slow.
>
> Thanks for any help!
>
> Karl Doron
>
> ----------------------------------
> 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 http://listserv.surfnet.nl/archives/fieldtrip.html
>  and http://www.ru.nl/neuroimaging/fieldtrip.
>

Dr. J.M. (Jan-Mathijs) Schoffelen
Donders Institute for Brain, Cognition and Behaviour,
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands
J.Schoffelen at donders.ru.nl
Telephone: 0031-24-3668063

----------------------------------
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 http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.