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<p style="margin-top:0; margin-bottom:0">Hello fieldtrip community,</p>
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<p style="margin-top:0; margin-bottom:0">I have a dataset I've been working with in EEGLAB, but I am now trying to use it in Fieldtrip. The dataset is a concatenation of extracted epochs from multiple participants. The data imports fine as an EDF. However,
EEGLAB's formatting for epochs means that there aren't triggers in the data. I have made my own header and trigger files in BrainVision format (I did it this way because I had BrainVision files to mimic, and it's listed on
<a href="http://www.fieldtriptoolbox.org/reference/ft_read_header" class="OWAAutoLink" id="LPlnk533632" previewremoved="true">
http://www.fieldtriptoolbox.org/reference/ft_read_header</a> as an acceptable format). My events read in fine with the *.vmrk file I have.
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<p style="margin-top:0; margin-bottom:0">My problem is that I haven't figured out how to read in the *.vhdr file I have successfully. When I've tried to read it in, it gives me an error that it can't identify the dataset that the header goes with. Without it,
I get the error below that *.vmrk isn't an accepted header file format. <br>
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<p style="margin-top:0; margin-bottom:0">I have two questions:</p>
<p style="margin-top:0; margin-bottom:0">(1) Am I right in my interpretation that the error I'm getting below is because I haven't read in the *.vhdr header file? If that's not correct, what does the error mean?</p>
<p style="margin-top:0; margin-bottom:0">(2) How can I read in the *.vhdr header file I have?
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<p style="margin-top:0; margin-bottom:0">The following is the code:</p>
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<div>%%file information<br>
AMBB = 'AM'; <br>
stimfreq = '6'; <br>
pathway = 'Z:\BB\Preprocessing\'; <br>
datafile = [pathway AMBB stimfreq '_3s_avgepoch_5.edf'];<br>
eventfile = [pathway AMBB stimfreq '_3s_avgepoch_5_ftevents.vmrk'] ;<br>
hdrfile = [pathway AMBB stimfreq '_3s_avgepoch_5_ftevents.vhdr'];<br>
output6 = [pathway AMBB stimfreq '_dics6.mat'];<br>
output12 = [pathway AMBB stimfreq '_dics12.mat'];<br>
output25 = [pathway AMBB stimfreq '_dics25.mat'];<br>
output50 = [pathway AMBB stimfreq '_dics50.mat'];<br>
%%read in events<br>
[event] = ft_read_event(eventfile); <br>
%%define trials<br>
cfg = [];<br>
cfg.trialdef.eventvalue = 2 ; <br>
cfg.trialdef.prestim = 1 ;<br>
cfg.trialdef.poststim = 3 ; <br>
cfg.dataset = eventfile ;<br>
cfg.trialfun = 'ft_trialfun_general'; <br>
[cfg] = ft_definetrial(cfg);</div>
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<p style="margin-top:0; margin-bottom:0">The following is the output:</p>
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<div>evaluating trialfunction 'ft_trialfun_general'<br>
Error using ft_notification (line 340)<br>
unsupported header format "brainvision_vmrk"<br>
<br>
Error in ft_error (line 39)<br>
ft_notification(varargin{:});<br>
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Error in ft_read_header (line 2478)<br>
ft_error('unsupported header format "%s"', headerformat);<br>
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Error in ft_trialfun_general (line 78)<br>
hdr = ft_read_header(cfg.headerfile, 'headerformat',<br>
cfg.headerformat);<br>
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Error in ft_definetrial (line 178)<br>
[trl, event] = feval(cfg.trialfun, cfg);<br>
<br>
///<br>
<br>
The *.vhdr and *.vmrk files are attached for reference. <br>
<br>
Thank you for any help or insight you can provide. <br>
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<p style="margin-top:0; margin-bottom:0">Lindsey Tate</p>
<p style="margin-top:0; margin-bottom:0">PhD Candidate</p>
<p style="margin-top:0; margin-bottom:0">University of Oklahoma</p>
<p style="margin-top:0; margin-bottom:0">lindseyrtate@ou.edu <br>
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