[FieldTrip] ft_denoise_synthetic 3rd order grad

[Stan van Pelt]

Hi Panagiotis, Good point, thanks. It works for me now. Best, Stan ----- Oorspronkelijk bericht -----
> Van: "Panagiotis Tsiatsis" <Panagiotis.Tsiatsis at Tuebingen.MPG.de>
> Aan: "Email discussion list for the FieldTrip project"
> <fieldtrip at donders.ru.nl>
> Verzonden: Maandag 16 april 2012 17:53:56
> Onderwerp: Re: [FieldTrip] ft_denoise_synthetic 3rd order grad
> Hello girls and guys,
> It is working for my CTF MEG data - the version that I have is v4692
> 2011-11-07.
> The other thing that might cause a problem could be ommiting the
> reference channels definition before the ft_ preprocessing command
> that gave you your "dataprepro"
> i.e maybe you might need something like this
> cfg = [];
> ...
> //various preprocessing parameters
> ...
> cfg.channel = {'MEG', 'MEGREF', 'REFGRAD' , 'REFMAG'};
> dataprepro = ft_preprocessing(cfg);
> Hope you are lucky :)
> Best,
> Panagiotis
> On 4/16/2012 4:59 PM, Stan van Pelt wrote:
> > Hi Barbara,
> > I can replicate your finding, but am unsure what is causing it.
> > Maybe
> > the difference/correction is lower than the Matlab or CTF precision?
> > In any case, if the 3rd order gradients were on,
> > ft_denoise_synthetic
> > would undo the G3BR-balancing, ergo it toggles.
> > Best,
> > Stan
> > ----- Oorspronkelijk bericht -----
> > > Van: "Michael Wibral" <michael.wibral at web.de>
> > > Aan: "Email discussion list for the FieldTrip project"
> > > <fieldtrip at donders.ru.nl>
> > > Verzonden: Maandag 16 april 2012 16:46:27
> > > Onderwerp: Re: [FieldTrip] ft_denoise_synthetic 3rd order grad
> > > Hi Barbara,
> > > are you certain that the original data do not have 3rd gradients
> > > enabled? - looking at them once in dataEditor, switching to 3rd
> > > grads
> > > and accidentally forgetting to unclick 'save parameters with
> > > dataset'
> > > will make them have 3rd grads...
> > > When I last used ft_denoise_synthetic it worked pretty much as
> > > described (??).
> > > Michael
> > > Gesendet: Montag, 16. April 2012 um 15:56 Uhr
> > > Von: "Barbara Haendel" <B.Haendel at gmx.net>
> > > An: fieldtrip at donders.ru.nl
> > > Betreff: [FieldTrip] ft_denoise_synthetic 3rd order grad
> > > Dear fieldtrip users,
> > > has anyone experience in using ft_denoise_synthetic? If I try to
> > > calculate 3rd order grads in the below specified way the data does
> > > not
> > > change with respect to the input data (which has no synthetic
> > > gradiometer applied). Is there some obvious misunderstanding on my
> > > side of how to use this function or is our environment truly
> > > noiseless
> > > :)
> > > Cheers,
> > > Barbara
> > > cfg=[];
> > > cfg.gradient ='G3BR';
> > > cfg.trials = 'all';
> > > data_3rdorder = ft_denoise_synthetic(cfg, dataprepro);
> > > >> data_3rdorder.grad.balance
> > > ans =
> > > G1BR: [1x1 struct]
> > > G2BR: [1x1 struct]
> > > G3BR: [1x1 struct]
> > > current: 'G3BR'
> > > previous: {'none'}
> > > >> sum(dataprepro.trial{8}(30,:)-data_3rdorder.trial{8}(30,:))
> > > ans = 0
> > > --
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> > --
> > Stan van Pelt
> > Donders Institute for Brain, Cognition and Behaviour, Radboud
> > University Nijmegen
> > Kapittelweg 29, 6525 EN Nijmegen, Netherlands
> > E-mail: stan.vanpelt at donders.ru.nl
> > Website: www.ru.nl/donders/
> > Phone: (+31) (0)24 36 10981
> > Fax: (+31) (0)24 36 10989
> > _______________________________________________
> > fieldtrip mailing list fieldtrip at donders.ru.nl
> > http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> --
> Panagiotis S. Tsiatsis
> Max Planck Institute for Biological Cybernetics
> Cognitive NeuroImaging Group
> Tuebingen, Germany
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-- Stan van Pelt Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Kapittelweg 29, 6525 EN Nijmegen, Netherlands E-mail: stan.vanpelt at donders.ru.nl Website: www.ru.nl/donders/ Phone: (+31) (0)24 36 10981 Fax: (+31) (0)24 36 10989 
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