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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dear Lars,<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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>most people I know who do combined EEG/fMRI recordings AND wish
to work with their data in EEGLAB actually do not use the fMRIB plugin for gradient
artifact correction due to the memory limitations in Matlab you describe and which
prove crippling for all but very small datasets. The problem is actually aggravated
further by the fact that nonsynchronized data would also require upsampling by
a factor of ~10 for offline alignment and this is when Matlab surely hits the
memory ceiling. <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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Typically, these people would therefore perform the gradient
artifact correction with BrainVision Analyzer and then export the data to EEGLAB
to continue on with the OBS pulse artifact correction of the fMRIB plugin.
After gradient correction the data will typically have been downsampled by a
factor of 10 or 20 and the resulting file size will be digestible for
Matlab/EEGLAB. Of course, being one of the people responsible for the
algorithms used in BrainVision Analyzer I would also like to invite you to try
your hand at its (excellent) pulse artifact correction, but I have to admit
that Rami's OBS approach is a good choice as well... ;-)<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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regarding your second question: The export from EEGLAB to the
BrainVision file format works very well and the data does not even have to be
imported or actively read into Analyzer. Simply add the files to your workspace's
Raw Files folder and they will show up ready for further action.<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:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Ingmar<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: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'>Dr. Ingmar Gutberlet<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Customer Support Manager<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Brain Products GmbH<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: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'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=EN-US style='font-family:"Tahoma","sans-serif"'>
eeglablist-bounces@sccn.ucsd.edu [mailto:eeglablist-bounces@sccn.ucsd.edu] <b>On
Behalf Of </b>Michels Lars<br>
<b>Sent:</b> Mittwoch, 28. Oktober 2009 16:35<br>
<b>To:</b> eeglablist@sccn.ucsd.edu<br>
<b>Subject:</b> [Eeglablist] BrainVision files<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-GB>Dear EEGlab members,<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>I am currently performing a MR gradient
correction for simultaneously recorded EEG-fMRI data in EEGlab.<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>In principle it works, however, it works
only for files with a sampling rate well below 5000 Hz. Otherwise I get an
error message: Out of memory. I thought the correction will work best for files
with the (original) sampling rate of 5000 Hz. Is there any way to import the
large raw file to EEGlab (file size is about 600 MB)?<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>Second question: There is an option to
export the file to BrainVision in EEGlab. Does anybody now whether the
(exported) file can be read/imported in BrainAnalyzer?<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>Best<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Lars<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 style='font-family:"Verdana","sans-serif";
color:blue'>Dr. phil. Lars Michels</span><span lang=EN-GB><br>
</span><span lang=EN-GB style='font-family:"Verdana","sans-serif";color:blue'>Postdoctoral
Fellow</span><span lang=EN-GB><br>
</span><span lang=EN-GB style='font-family:"Verdana","sans-serif";color:blue'>Universitäts-Kinderspital</span><span
lang=EN-GB> <br>
</span><span lang=EN-GB style='font-family:"Verdana","sans-serif";color:blue'>Steinwiesstrasse
75</span><span lang=EN-GB> <br>
</span><span lang=EN-GB style='font-family:"Verdana","sans-serif";color:blue'>8032
Zürich</span><span lang=EN-GB> <br>
</span><span lang=EN-GB style='font-family:"Verdana","sans-serif";color:blue'>Tel.
0041 44 266 78 28</span><span lang=EN-GB><br>
</span><span lang=EN-GB style='font-family:"Verdana","sans-serif";color:blue'>Fax
0041 44 266 71 53</span><span lang=EN-GB> <br>
</span><span lang=EN-GB style='font-family:"Verdana","sans-serif";color:blue'>http://www.kispi.uzh.ch/af/ForschungLehre/zentrum_de.html<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>
<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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