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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Peter,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In addition to Steve’s perfect suggestion, you might want to take a look at this example script, which basically is a data-driven way to define
trials:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.fieldtriptoolbox.org/example/detect_the_muscle_activity_in_an_emg_channel_and_use_that_as_trial_definition">http://www.fieldtriptoolbox.org/example/detect_the_muscle_activity_in_an_emg_channel_and_use_that_as_trial_definition</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Here, co-recorded EMG-data is used to define trials, but in your case you can use (some parameter in) your MEG data (e.g., some ‘cleaniness’ measure).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Stan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">Stan van Pelt, PhD<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas">Donders Institute for Brain, Cognition and Behaviour<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas">Radboud University<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas">Montessorilaan 3, B.01.34<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:Consolas">6525 HR Nijmegen, the Netherlands<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas">tel: +31 24 3616288
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> fieldtrip-bounces@science.ru.nl [mailto:fieldtrip-bounces@science.ru.nl]
<b>On Behalf Of </b>Stephen Politzer-Ahles<br>
<b>Sent:</b> maandag 29 juni 2015 15:32<br>
<b>To:</b> fieldtrip@science.ru.nl<br>
<b>Subject:</b> Re: [FieldTrip] Help Manually Defining Trials<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Peter,<br>
<br>
<a href="http://www.fieldtriptoolbox.org/reference/ft_definetrial">http://www.fieldtriptoolbox.org/reference/ft_definetrial</a> describes the format of the trial definition matrix; you can simply create a matrix like this using the times that you would like
to choose for your epochs, and then run ft_preprocessing() with this matrix as the input for cfg.trl. (This is basically a combination of methods (1) and (2) that you suggested below.)<o:p></o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">Steve<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">Stephen Politzer-Ahles<br>
New York University, Abu Dhabi<br>
Neuroscience of Language Lab<br>
<a href="http://www.nyu.edu/projects/politzer-ahles/" target="_blank">http://www.nyu.edu/projects/politzer-ahles/</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Jun 29, 2015 at 2:00 PM, <<a href="mailto:fieldtrip-request@science.ru.nl" target="_blank">fieldtrip-request@science.ru.nl</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal"><br>
<br>
Message: 1<br>
Date: Sun, 28 Jun 2015 23:51:19 -0400<br>
From: Peter Lyons <<a href="mailto:plyons@udel.edu">plyons@udel.edu</a>><br>
To: FieldTrip discussion list <<a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>><br>
Subject: [FieldTrip] Help Manually Defining Trials<br>
Message-ID:<br>
<CALq-V2qi104MwTnq26qr4EwKPkZkBMEBzstS5JPRxZKVMrr=<a href="mailto:sw@mail.gmail.com">sw@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Dear All,<br>
<br>
My name is Peter Lyons, and I am a researcher at the University of<br>
Delaware. Currently, I am conducting resting state EEG research with the<br>
intention of using Fieldtrip to calculate the power of different frequency<br>
bands as well as phase lag index between various sensors. My dataset is a<br>
continuous recording sampled at 1000 hz for 30 minutes. I do not have any<br>
events or triggers in my data.<br>
<br>
I would like to manually select the cleanest segments of my data following<br>
artifact rejection, and define them as trials.<br>
<br>
Theoretically, I see three ways to segment my data manually:<br>
<br>
1. Insert individual triggers throughout my data (at locations determined<br>
via ft_databrowser), and then define trials based on these triggers.<br>
<br>
2. Define trials based on a beginning and ending sample number.<br>
<br>
3. Use ft_databrowser to select segments of data as if they were<br>
artifacts, and then define these "artifacts" as trials instead of rejecting<br>
them from the dataset.<br>
<br>
Could anyone advise on how to code one of the above methods?<br>
<br>
Any help is welcome and appreciated!<br>
<br>
Thanks,<br>
Peter<br>
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