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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear fieldtrip users, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I am new to fieldtrip and I have the following issue regarding preprocessing of EEG and ICA.
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-GB">I want to: <o:p>
</o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">import my .cnt data<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">chop my file to 5 different files that correspond to each of my tasks
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">then take one part of my file that correspond to one of my tasks and filter, demean, rerefernce, resample raw data<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">ICA raw data<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">Then define epochs <o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-GB"><span style="mso-list:Ignore">6.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-GB">& then proceed with the rest of the analysis<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">One of my tasks has repetitive triggers with the code 1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">So I want to take only the part of my raw data that corresponds to this task(including some ms before the first trigger and some after ) and then at a later stage epoch my data.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Should I create one trial_fun that chop my data to 5 datasets corresponding to each task, then call ft_definetrial, then preprocess the data, ICA them and then call again the ft_defientrial with another trial_fun to
chop my data into epochs?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Is that even possible ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB">The way I try to do it now is :<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB">first define trial with :</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New"">cfg.trialdef.eventtype = 'trigger';</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New"">cfg.trialdef.eventvalue = '1'
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New"">cfg.trialdef.prestim = 0.005; % in seconds</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New"">cfg.trialdef.poststim = 0.01; % in seconds</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black">cfg1 = ft_definetrial(cfg);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black">Then I call</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black"> ft_preprocessing(cfg);
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black">with</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black"> cfg.continuous =
</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:#A020F0">'yes'</span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black">;
</span><span lang="EN-GB" style="font-size:12.0pt;color:black">to make sure that when I ll perform ICA it will be on continuous data.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black">and then when I run ICA it produces an expected error that I cannot run ICA on epoched data (it needs raw).<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black">So I have to epoch after the ICA, but how should I select the part that only corresponds to one of my tasks?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black"><br>
Thank you for your time. <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black">Best,
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;color:black">Nadia
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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