[FieldTrip] Problems with automatic artifact rejection

[Alicia González]

I'm using the data provided in the tutorial: ArtifactMEG.ds (This dataset
was acquired continuously with trials of 10 seconds, and during the
recording the experimenter instructed the subject to make artifacts and
wrote down the trial number in which the artifacts were made)
And I running the code below:

cfg                    = [];
cfg.dataset            = 'ArtifactMEG.ds';
cfg.headerformat       = 'ctf_ds';
ctf.dataformat         = 'ctf_ds';
cfg.trialdef.eventtype = 'trial';
cfg                    = ft_definetrial(cfg);

trl                    = cfg.trl(1:50,:); % just use the first 50 trials for
the time being

% jump
cfg                    = [];
cfg.trl = trl;
cfg.padding = 0;
cfg.datafile   = 'ArtifactMEG.ds';
cfg.headerfile = 'ArtifactMEG.ds';
cfg.continuous = 'yes';

% channel selection, cutoff and padding
cfg.artfctdef.zvalue.channel    = 'MEG';
cfg.artfctdef.zvalue.cutoff     = 20;
cfg.artfctdef.zvalue.trlpadding = 0.5*cfg.padding;
cfg.artfctdef.zvalue.artpadding = 0.5*cfg.padding;
cfg.artfctdef.zvalue.fltpadding = 0;

% algorithmic parameters
cfg.artfctdef.zvalue.cumulative    = 'yes';
cfg.artfctdef.zvalue.medianfilter  = 'yes';
cfg.artfctdef.zvalue.medianfiltord = 9;
cfg.artfctdef.zvalue.absdiff       = 'yes';

% make the process interactive
cfg.artfctdef.zvalue.interactive = 'yes';

[cfg, artifact_jump] = ft_artifact_zvalue(cfg);

2011/10/21 jan-mathijs schoffelen <jan.schoffelen at donders.ru.nl>

> Hi Alicia,
>
> In order to be able to address your problem we need some additional
> feedback of course. What kind of data are you using, etc?
>
> BW,
>
> JM
>
> On Oct 21, 2011, at 8:34 AM, Alicia González wrote:
>
>
>
> Hi,
>
> I'm trying to do automatic artifact rejection using the tutorial on the
> site. It seems that everything runs ok but, when I try to see the z-score
> figure setting cfg.artfctdef.zvalue.interactive = 'yes', nothing appears
> (and no errors are found). I'm just using the code from the tutorial without
> changes.
>
> thanks in advance.
>
>
>
> _______________________________________________
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> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
>
> Jan-Mathijs Schoffelen, MD PhD
> Donders Institute for Brain, Cognition and Behaviour,
> Centre for Cognitive Neuroimaging,
> Radboud University Nijmegen, The Netherlands
> J.Schoffelen at donders.ru.nl
> Telephone: +31-24-3614793
>
>
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> fieldtrip at donders.ru.nl
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>
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