[FieldTrip] re-referencing EEG signals

[Tzvetan Popov]

Hi Hweeling,

> 
> 
> Another question, is there an easier way to re-reference the EEG signals to an averaged montage?
yes quite easy. Just specify cfg.reref = ‘yes’; and cfg.refchannel = ‘all’; during the call to ft_preprocessing.
best
tzvetan

> 
> Cheers,
> Hweeling
> 
> 
> 
> On 30 June 2014 15:26, "Jörn M. Horschig" <jm.horschig at donders.ru.nl> wrote:
> Dear Hweeling,
> 
> re-referencing is a linear step and can be done at any time preceding any non-linear transformation, e.g. computing a power spectrum. So it depends on what type of preprocessing you have planned, but for the most usual preprocessing steps the answer is that it would not make any difference when exactly you are doing this.
> 
> Best,
> Jörn
> 
> 
> On 6/30/2014 11:19 AM, Hwee Ling Lee wrote:
> Dear all,
> 
> I was wondering if re-referencing of EEG signals should be done before trial definition or after all the preprocessing have been done.
> 
> Would it make a difference in terms of statistical analyses?
> 
> Thanks.
> 
> Best regards,
> Hweeling
> 
> 
> 
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> 
> -- 
> Jörn M. Horschig
> PhD Student
> Donders Institute for Brain, Cognition and Behaviour
> Centre for Cognitive Neuroimaging
> Radboud University Nijmegen
> Neuronal Oscillations Group
> FieldTrip Development Team
> 
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> 
> -- 
> =================================================
> Dr. rer. nat. Lee, Hwee Ling
> Postdoc
> German Center for Neurodegenerative Diseases (DZNE) Bonn
> 
> Email 1: hwee-ling.lee<at>dzne.de
> Email 2: hweeling.lee<at>gmail.com
> 
> https://sites.google.com/site/hweelinglee/home
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