[FieldTrip] Changed phase convention 'wavelet' ('wltconvol')

Roemer van der Meij r.vandermeij at donders.ru.nl
Wed Apr 20 20:16:25 CEST 2011

Hi everybody,

We have changed the meaning of phases of /raw/ Fourier-coefficients of 
method = 'wavelet' (previously 'wltconvol'), so that it is in alignment 
with method = 'mtmconvol'.
All output is now phase-shifted such that an angle of 0 of any 
Fourier-coefficient always means a peak of an oscillation in the data, 
and an angle of pi/-pi will always mean the trough of an oscillation 
(wavelet wise angle = 0 is implemented as cosine at peak, and sine in 
up-going flank) (also documented in the FAQ section here 

Processed phases, like those in a cross-spectral density array and it's 
children like coherence, PLVs etc., will /not /be different. You will 
only notice the difference if you choose cfg.output = 'fourier'.

The change will be latest version on our FTP-server tonight.


Roemer van der Meij M.Sc.
PhD student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognition
Radboud University Nijmegen
P.O. Box 9104
6500 HE Nijmegen
The Netherlands
Tel: +31(0)24 3655932
E-mail: r.vandermeij at donders.ru.nl
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20110420/2926de56/attachment-0001.html>

More information about the fieldtrip mailing list