[FieldTrip] problem with ft_rejectartifact

Ayelet Landau ayelet.landau at gmail.com
Tue Sep 4 13:23:21 CEST 2012

Dear FieldTrip experts,

I have encountered a strange behavior in ft_rejectartifact script.

artifacts are defined in variables that contain two collumns and fed into
this function as follows:
         cfg.artfctdef.eog.artifact =artifact_eog_all;

other parameters I use are:
        cfg.artfctdef.reject = 'partial';
        cfg.artfctdef.minaccepttim  = .2;

then I run ft_rejectartifact with this cfg (and many more categories of
artifacts as exemplified above) and a structure containing my preprocessed
data (with a the same trl I give in cfg.trl above). This is an example of
what the data structure fed into ft_rejectartifact might looks like

          hdr: [1x1 struct]
       fsample: 1200
          grad: [1x1 struct]
    sampleinfo: [50x2 double]
     trialinfo: [50x4 double]
         trial: {1x50 cell}
          time: {1x50 cell}
         label: {275x1 cell}
           cfg: [1x1 struct]

and here is the error that I get:

??? Subscripted assignment dimension mismatch.

Error in ==> ft_redefinetrial at 253
      data.trialinfo(iTrl,:) = dataold.trialinfo(iTrlorig,:);

Error in ==> ft_rejectartifact at 483
    data       = ft_redefinetrial(tmpcfg, data);

When I run ft_rejectartifact with a cfg.data field calling my *.ds file, I
get the following which I could probably use later as an adjusted trl for
       datafile: 'XX_20120821_05.ds'
             trl: [79x7 double]
       artfctdef: [1x1 struct]
     trackconfig: 'off'
     checkconfig: 'loose'
       checksize: 100000
    showcallinfo: 'yes'
      headerfile: 'XX_20120821_05.ds'
          trlold: [50x7 double]
        callinfo: [1x1 struct]
         version: [1x1 struct]

Its a bit strange that my original approach stopped working. Any insights
most welcome!

Ayelet N. Landau

Postdoctoral Scientist,
Ernst Strüngmann Institute (ESI) for Neuroscience
in Cooperation with Max Planck Society
Deutschordenstr. 46, D-60528 Frankfurt

Mobile:      +49 (0)16 22733 110
Fax:      +49 (0)69 96769 555
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