[FieldTrip] Problems with automatic artifact rejection

Alicia González ali.gm88 at gmail.com
Mon Oct 24 13:13:20 CEST 2011


Hi,

I solved the problem adding:
 cfg.artfctdef.zvalue.feedback = 'yes';
Now I can see the figures of the z-score of the processed data.

El 21 de octubre de 2011 11:08, Alicia González <ali.gm88 at gmail.com>escribió:

> 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.
>>
>>
>>
>> _______________________________________________
>> fieldtrip mailing list
>> 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
>>
>>
>> _______________________________________________
>> fieldtrip mailing list
>> fieldtrip at donders.ru.nl
>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>
>
>
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