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<p style="">Hi Haiteng,<br>
</p>
<p style=""><br>
</p>
<p style="">Basically the automatic artefact detection algorithms removes some EEG (if artefactual) and splits the data into two trials. These trials are not the same size.<br>
</p>
<p style=""><br>
</p>
<p style="">TRENTOOL can only work on trials that are the same length. So I determined what the biggest trial length was and redefined the trials.<br>
</p>
<p style=""><br>
</p>
<p style="">ie cfg = []<br>
</p>
<p style=""><span> </span>cfg.length = x length<br>
</p>
<p style=""><span> </span>ft_redefinetrial( cfg, data)<br>
</p>
<p style=""><br>
</p>
<p style="">However this is causing computational errors later on. So I was wondering whether you could append the trials together and place a discontinuation marker between them.<br>
</p>
<p style=""><br>
</p>
<p style="">The other thing I tried was to pass in the argument 'nan' into the reject artefact function, but then this causes an issue with the virtual channel procedure.<br>
</p>
<p style=""><br>
</p>
<p style="">Tyler<br>
</p>
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<div style="font-size:13px">*************************
<div style="font-family:Tahoma"><br>
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<div><font face="Arial"><i>Tyler Grummett ( BBSc, BSc(Hons I))</i></font></div>
<div><font face="Arial"><i>PhD Candidate</i></font></div>
<div><font face="Arial"><i>Brain Signals Laboratory</i></font></div>
<div><font face="Arial"><i>Flinders University</i></font></div>
<div><font face="Arial"><i>Rm 5A301</i></font></div>
<div><font face="Arial"><i>Ext 66124</i></font></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> fieldtrip-bounces@science.ru.nl <fieldtrip-bounces@science.ru.nl> on behalf of Haiteng Jiang <haiteng.jiang@gmail.com><br>
<b>Sent:</b> Monday, 14 April 2014 9:04 PM<br>
<b>To:</b> fieldtrip@science.ru.nl<br>
<b>Subject:</b> Re: [FieldTrip] automatic artifact correction after virtual channels/beamformer</font>
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<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left-width:1px; border-left-color:rgb(204,204,204); border-left-style:solid; padding-left:1ex">
Hi Tyler ,<br>
</blockquote>
<div> I think it makes sense to apply the inverse spatial filter on the the marked out data since you build it on this interval. In other words, non-marked out intervals data has different inverse filter. I don't understand appending trials
after automatic artefact detection. Do you mean keep trials after automatic artefact detection ?</div>
<div><br>
</div>
<div> Best,</div>
<div> Haiteng</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left-width:1px; border-left-color:rgb(204,204,204); border-left-style:solid; padding-left:1ex">
<br>
Message: 3<br>
Date: Mon, 14 Apr 2014 07:26:44 +0000<br>
From: Tyler Grummett <<a href="mailto:tyler.grummett@flinders.edu.au">tyler.grummett@flinders.edu.au</a>><br>
To: FieldTrip discussion list <<a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>><br>
Subject: Re: [FieldTrip] automatic artifact correction after virtual<br>
channels/beamformer<br>
Message-ID:<br>
<<a href="mailto:149bb27d65e749c5b37bb3bfab16e87b@SIXPR03MB368.apcprd03.prod.outlook.com">149bb27d65e749c5b37bb3bfab16e87b@SIXPR03MB368.apcprd03.prod.outlook.com</a>><br>
<br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Hello Haiteng,<br>
<br>
<br>
Thankyou for the response. Yes I have gone through the tutorial. I use clean data to make the inverse spatial filter. But do then apply it to<br>
<br>
marked out data or can apply it to non-marked out data. Also, is there a way to append trials after you run an automatic artefact<br>
<br>
rejection algorithm over it? At the moment, I am trying to use a function that requires equal trial lengths. I can use ft_redefinetrial<br>
<br>
to grab a 2 second epoch from each 'trial'. However that feel a little crude as I am throwing out a lot of data.<br>
<br>
<br>
Your help will be greatly appreciated.<br>
<br>
<br>
Tyler<br>
<br>
<br>
*************************<br>
<br>
Tyler Grummett ( BBSc, BSc(Hons I))<br>
PhD Candidate<br>
Brain Signals Laboratory<br>
Flinders University<br>
Rm 5A301<br>
Ext 66124<br>
________________________________<br>
From: <a href="mailto:fieldtrip-bounces@science.ru.nl">fieldtrip-bounces@science.ru.nl</a> <<a href="mailto:fieldtrip-bounces@science.ru.nl">fieldtrip-bounces@science.ru.nl</a>> on behalf of Haiteng Jiang <<a href="mailto:haiteng.jiang@gmail.com">haiteng.jiang@gmail.com</a>><br>
Sent: Monday, 14 April 2014 3:53 PM<br>
To: <a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a><br>
Subject: Re: [FieldTrip] automatic artifact correction after virtual channels/beamformer<br>
<br>
Hi Tyler,<br>
It is always nice to computate virtual MEG channels based on artifact-corrected CLEAN data . Note that we use clean data to get the inverse spatial filter by DICS. Regrading to how to create virtual channel , please have a look at tutorial:
<a href="http://fieldtrip.fcdonders.nl/tutorial/shared/virtual_sensors" target="_blank">
http://fieldtrip.fcdonders.nl/tutorial/shared/virtual_sensors</a><br>
<br>
Best,<br>
Haiteng<br>
<br>
<br>
<br>
Message: 2<br>
Date: Mon, 14 Apr 2014 02:54:16 +0000<br>
From: Tyler Grummett <<a href="mailto:tyler.grummett@flinders.edu.au">tyler.grummett@flinders.edu.au</a><mailto:<a href="mailto:tyler.grummett@flinders.edu.au">tyler.grummett@flinders.edu.au</a>>><br>
To: FieldTrip discussion list <<a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a><mailto:<a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>>><br>
Subject: [FieldTrip] automatic artifact correction after virtual<br>
channels/beamformer<br>
Message-ID:<br>
<<a href="mailto:d9f26aff9ba640b29bfa36febf84e9cc@SIXPR03MB368.apcprd03.prod.outlook.com">d9f26aff9ba640b29bfa36febf84e9cc@SIXPR03MB368.apcprd03.prod.outlook.com</a><mailto:<a href="mailto:d9f26aff9ba640b29bfa36febf84e9cc@SIXPR03MB368.apcprd03.prod.outlook.com">d9f26aff9ba640b29bfa36febf84e9cc@SIXPR03MB368.apcprd03.prod.outlook.com</a>>><br>
<br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
?Hello all,<br>
<br>
<br>
I was just wondering whether it is necessary to use the artifact corrected data when creating virtual channels from beamformer sources<br>
<br>
or whether you are able to use original, non-artifact corrected data.<br>
<br>
<br>
Tyler<br>
<br>
<br>
*************************<br>
<br>
Tyler Grummett ( BBSc, BSc(Hons I))<br>
PhD Candidate<br>
Brain Signals Laboratory<br>
Flinders University<br>
Rm 5A301<br>
Ext 66124<br>
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------------------------------<br>
<br>
<br>
<br>
<br>
--<br>
Haiteng Jiang<br>
PhD candidate<br>
Neuronal Oscillations Group<br>
Donders Institute for Brain, Cognition and Behaviour<br>
Centre for Cognitive Neuroimaging<br>
Radboud University Nijmegen<br>
<br>
Visiting address<br>
Room 2.32<br>
Donders Centre for Cognitive Neuroimaging<br>
Kapittelweg 29<br>
6525 EN Nijmegen<br>
the Netherlands<br>
<br>
Tel.: <a href="tel:%2B31%20%280%29243668291" value="+31243668291">+31 (0)243668291</a><br>
Web: <a href="https://sites.google.com/site/haitengjiang/" target="_blank">https://sites.google.com/site/haitengjiang/</a><br>
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-- <br>
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<div><font face="arial, helvetica, sans-serif">Haiteng Jiang</font></div>
<div><font face="arial, helvetica, sans-serif">PhD candidate</font></div>
<div><font face="arial, helvetica, sans-serif">Neuronal Oscillations Group</font></div>
<div><font face="arial, helvetica, sans-serif">Donders Institute for Brain, Cognition and Behaviour</font></div>
<div><font face="arial, helvetica, sans-serif">Centre for Cognitive Neuroimaging</font></div>
<div><font face="arial, helvetica, sans-serif">Radboud University Nijmegen</font></div>
<div><span style="line-height:18px; background-color:rgb(255,255,255)"><font face="arial, helvetica, sans-serif"><br>
</font></span></div>
<div><span style="line-height:18px; background-color:rgb(255,255,255)"><font face="arial, helvetica, sans-serif">Visiting address</font></span></div>
<div>
<div style="text-align:left; background-color:rgb(255,255,255)">
<div><span style="line-height:18px"><font face="arial, helvetica, sans-serif">Room 2.32</font></span></div>
<div><span style="line-height:18px"><font face="arial, helvetica, sans-serif">Donders Centre for Cognitive Neuroimaging</font></span></div>
<div><span style="line-height:18px"><font face="arial, helvetica, sans-serif">Kapittelweg 29</font></span></div>
<div><span style="line-height:18px"><font face="arial, helvetica, sans-serif">6525 EN Nijmegen</font></span></div>
<div><span style="line-height:18px"><font face="arial, helvetica, sans-serif">the Netherlands</font></span></div>
<div><span style="line-height:18px"><font face="arial, helvetica, sans-serif"><br>
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<div><font face="arial, helvetica, sans-serif"> Tel.: +31 (0)243668291</font></div>
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<div><font face="arial, helvetica, sans-serif"> Web: <a href="https://sites.google.com/site/haitengjiang/" target="_blank">https://sites.google.com/site/haitengjiang/</a></font></div>
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