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Good evening,</div>
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Hope your day is going well.</div>
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My name is Vanessa Ayo- Jibunoh and I am working in the Perception Lab at the CUNY Graduate Center in New York city on Ensemble Perception. I am currently analyzing data for this project, where we recorded using EEG.</div>
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I'm reaching out because I keep getting this error message "Error using ft_definetrial (line 209)<br>
no trials were defined, see FT_DEFINETRIAL for help" when I try to define my trials.</div>
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I'm working with a .set datafile from EEGlab and I'm trying to separate my EEG data by trials using the ft_definetrail function. </div>
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Provided below are the cfg details I'm working with.</div>
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cfg =</div>
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struct with fields:</div>
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datafile: 'Acquisition 09.set'</div>
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trialfun: 'trialfun_orientation_trigger'</div>
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trialdef: [1×1 struct]</div>
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And, as it is an EEG datafile, this is the event structure.</div>
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event =</div>
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1×1798 struct array with fields:</div>
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type</div>
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value</div>
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sample</div>
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offset</div>
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duration</div>
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urevent</div>
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I have written the code for the "trialfun" function that precedes the ft_definetrialfunction and it seems to be written just fine and according to the code provided by this link on the fieldtrip website itself "<a href="https://www.fieldtriptoolbox.org/example/trialfun/" id="OWA16fc12ae-0c2e-0181-5792-f06efcfedfa7" class="OWAAutoLink">Making
your own trialfun for conditional trial definition - FieldTrip toolbox</a>" . This is the code;</div>
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function [trl, event] = trialfun_orientation_trigger(cfg);</div>
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cfg.dataset = 'Acquisition 09.set'</div>
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cfg.trialdef.prestim = 0.5</div>
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cfg.trialdef.poststim = 1</div>
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hdr = ft_read_header(cfg.dataset)</div>
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event = ft_read_event (cfg.dataset)</div>
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value = [event(find(strcmp('trigger', {event.type}))).value]'</div>
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sample = [event(find(strcmp('trigger', {event.type}))).sample]'</div>
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pretrig = -round(cfg.trialdef.prestim * hdr.Fs)</div>
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posttrig = round(cfg.trialdef.poststim * hdr.Fs)</div>
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trl = []</div>
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for j = 1:(length(value)-1)</div>
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trg1 = value(j);</div>
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trg2 = value (j+2);</div>
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if trg1==10 && trg2==50</div>
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trlbegin = sample(j) + pretrig;</div>
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trlend = sample(j) + posttrig;</div>
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offset = pretrig;</div>
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newtrl = [trlbegin trlend offset];</div>
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trl = [trl; newtrl];</div>
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end</div>
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end</div>
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end</div>
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However, when I plug this function into another code to define the trial, it gives me the error "Error using ft_definetrial (line 209) no trials were defined, see FT_DEFINETRIAL for help". </div>
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I will also provide the final code that is giving me a problem below</div>
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cfg = []</div>
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cfg.datafile = 'Acquisition 09.set' ;</div>
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cfg.trialfun = 'trialfun_orientation_trigger';</div>
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cfg.trialdef.eventtype = 'trigger';</div>
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cfg.trialdef.eventvalue = [0 10 20];</div>
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cfg.trialdef.prestim = .5;</div>
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cfg.trialdef.poststim = 1;</div>
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ft_definetrial(cfg);</div>
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I'm not sure if it is a syntax error or I would have to write another code separately to define the 'trigger' in the event type as well to get the ft_definetrial function to work. I would like assistance from someone who is better experienced with this please.</div>
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Thank you,</div>
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God bless you.</div>
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