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Hi Christine,
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<div class="">Checking for the number of unique rows in the sampleinfo field does not ensure that the data are not overlapping.</div>
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<div class="">e.g.</div>
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<div class="">data.sampleinfo = [1 200;</div>
<div class=""> 100 300];</div>
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<div class="">is a valid specification, and unique(data.sampleinfo, ‘rows’) gives 2, yet the samples are overlapping.</div>
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<div class="">I don’t think the loss of chronology is causing the problem.</div>
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<div class="">Best,</div>
<div class="">Jan-Mathijs</div>
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<blockquote type="cite" class="">
<div class="">On 08 May 2016, at 14:10, Blume Christine <<a href="mailto:christine.blume@sbg.ac.at" class="">christine.blume@sbg.ac.at</a>> wrote:</div>
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Dear Jan-Mathijs,<br class="">
<br class="">
Many thanks for your swift response. You were right, I am losing the sampleinfo generating<font face="Courier New" class="">tmpdata_small</font>. However, even when I use the original data, i.e.<span class="Apple-converted-space"> </span><font face="Courier New" class="">data_segm_offsetcorr</font><span class="Apple-converted-space"> </span>that
includes the sampleinfo, the problem continues to occur. However, I now get the warning that<span class="Apple-converted-space"> </span><font face="Courier New" class="">samples are present in multiple trials<font face="Tahoma" class="">. Checking the the
number of unique rows in</font></font><font face="Courier New" class=""><font face="Tahoma" class=""><font face="Courier New" class="">data_segm_offsetcorr.sampleinfo<span class="Apple-converted-space"> </span><font face="Tahoma" class="">however finds the
correct number of trials, it seems as if there were no doublings (which I would also not expect).<span class="Apple-converted-space"> </span><br class="">
<br class="">
My trials are not in chronological order, though, but sorted according to<span class="Apple-converted-space"> </span></font></font></font></font><font face="Courier New" class=""><font face="Tahoma" class=""><font face="Courier New" class=""><font face="Tahoma" class=""><font face="Courier New" class=""><font face="Courier New" class="">data_segm_offsetcorr.</font>trialinfo</font>.
May that confuse fieldtrip?<br class="">
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Best,<br class="">
Christine<br class="">
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<div id="divRpF721715" style="direction: ltr;" class=""><font face="Tahoma" size="2" class=""><b class="">Von:</b><span class="Apple-converted-space"> </span><a href="mailto:fieldtrip-bounces@science.ru.nl" class="">fieldtrip-bounces@science.ru.nl</a> [<a href="mailto:fieldtrip-bounces@science.ru.nl" class="">fieldtrip-bounces@science.ru.nl</a>]"
im Auftrag von "Schoffelen, J.M. (Jan Mathijs) [<a href="mailto:jan.schoffelen@donders.ru.nl" class="">jan.schoffelen@donders.ru.nl</a>]<br class="">
<b class="">Gesendet:</b><span class="Apple-converted-space"> </span>Sonntag, 08. Mai 2016 09:46<br class="">
<b class="">An:</b><span class="Apple-converted-space"> </span>FieldTrip discussion list<br class="">
<b class="">Betreff:</b><span class="Apple-converted-space"> </span>Re: [FieldTrip] ft_databrowser & ft_rejectartifact - wrong number of trials rejected<br class="">
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<div class="">Hi Christine,
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<div class="">Are you sure that the tmpdata_small and data_segm_offsetcorr are consistent with respect to each other? As long as this is not the case, I am not surprised that fieldtrip ‘misbehaves’.</div>
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<div class="">Best,</div>
<div class="">Jan-Mathijs</div>
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<blockquote type="cite" class="">
<div class="">On 08 May 2016, at 09:26, Blume Christine <<a href="mailto:christine.blume@sbg.ac.at" class="" target="_blank">christine.blume@sbg.ac.at</a>> wrote:</div>
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<font class="" size="2">Good morning,<br class="">
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I discovered that using ft_databrowser & ft_rejectartifact to preprocess my EEG data, often the wrong number of trials is rejected. This is the code I am using and it inherits data resulting from ft_redefinetrial.<br class="">
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<font class="" face="Courier New"> cfg = [];<br class="">
cfg.latency = [-2 2];<span class="Apple-converted-space"> </span><font class="" color="808000">% period of interest</font><br class="">
tmpdata_small = ft_selectdata(cfg,data_segm_offsetcorr);<br class="">
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cfg = [];<br class="">
cfg.layout = layout2;<br class="">
cfg.showlabel = 'yes';<br class="">
cfg.channel = 'EEG';<br class="">
cfg.gradscale = 0.04;<br class="">
cfg.continuous = 'no';<br class="">
<font class="" color="808000"> % filtering only for artifact rejection</font><br class="">
cfg.preproc.lpfilter = 'yes';<br class="">
cfg.preproc.lpfreq = 40;<br class="">
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cfg_databrowser = ft_databrowser(cfg, tmpdata_small);<br class="">
data_segm_offsetcorr = ft_rejectartifact(cfg_databrowser, data_segm_offsetcorr);<br class="">
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<font class="" face="Calibri" size="3">If I now, for example mark 10 trials in the databrowser and then run ft_rejectartifact, it tells me:<span class="Apple-converted-space"> </span><br class="">
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<font class="" face="Courier New" size="2">detected 10 visual artifacts<br class="">
rejected 8 artifacts completely<br class="">
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<font class="" size="3"><font class="" face="Calibri">Something seems to be wrong here as I clearly marked 10 artifacts (don't really care whether they are visual or not), but only 8 are removed. The problem gets worse when I call the function a second time,
which is when usually none of the marked artefacts are rejected at all.<br class="">
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Any idea where the problem could be?<br class="">
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Many thanks!<br class="">
Best,<br class="">
Christine</font></font></font></font><span class="Apple-converted-space"> </span></font><br class="">
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