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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">After the rejections of noisy data in the time domain (noisy epochs) because you run the IC analysis after those
exclusions but before the exclusion ICs. Fitting dipoles to all ICs will help you in classification of artifact based on residual variance and dipoles found outside the head volume.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">It depends on what you want to do. If you want to run time frequency analysis from 3 Hz you need long baseline
and thus epochs. However, longer epochs gives you higher probability of having non frequent artifacts (jaw clinching, dry eye blinks, head movement etc.) which are hard for the ICA to decompose. If it is necessary, you can transfer ICs from ICA performed on
shorter epochs to longer epochs.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I believe dipfit() default is residual variance minimization, if you set a RV threshold to 100% local minima
is always possible. After that it’s your decision what cut off to use, I believe recommended RV is 15% and to exclude dipoles found outside the head volume, this can easily be done when you use the STUDY function.<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;mso-fareast-language:EN-US"><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;mso-fareast-language:EN-US">Regards,<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;mso-fareast-language:EN-US">Jens<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;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Från:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> eeglablist [mailto:eeglablist-bounces@sccn.ucsd.edu]
<b>För </b>Carolina Pletti<br>
<b>Skickat:</b> den 9 november 2017 16:44<br>
<b>Till:</b> eeglablist@sccn.ucsd.edu<br>
<b>Ämne:</b> [Eeglablist] practical questions about Dipfit<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dear EEGlab community,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I have a few questions regarding Dipfit.<o:p></o:p></p>
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<p class="MsoNormal">1 - would you recommend fitting the dipoles before or after artifact rejection?<o:p></o:p></p>
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<p class="MsoNormal">2 - Is there any suggestions on whether to run it on long (e.g. 3000 ms or more) vs short (e.g. 1000 ms) data epochs?<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">3 - what should one do when it finds a local minimum, or when a local minimum is possible? Is it normal that it is
<i>always </i>possible?<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Thank you very much!<o:p></o:p></p>
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<p class="MsoNormal">Carolina Pletti<o:p></o:p></p>
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