<div dir="ltr">Hi Harald,<div><br></div><div>I did the ICA based on the continuos recorded block (~7 minutes), including 100 trials, with PCA option on. The attached file is the ICA topography and waveform (ICA 22). The spectrum showed that the peak power was at ~11Hz.</div><div>I suspected it is a neck movement artifact, because the generator seems to be in the front of the neck. Also, I got another similar ICA component from another subject, and the topography seems to be centered at the back of the neck, would it be considered as neck movement too.</div><div><br></div><div>Thank you very much once again!</div><div><br></div><div>Best,</div><div>Andrew</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 18, 2016 at 7:49 AM, Harald Bornfleth <span dir="ltr"><<a href="mailto:Harald.Bornfleth@besa.de" target="_blank">Harald.Bornfleth@besa.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-GB" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Dear Andrew,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">A couple of questions popped up. <u></u><u></u></span></p><p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>1)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The neck movement artifact, is this something with low frequency, or is it a muscle artifact?<u></u><u></u></span></p><p><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span>2)<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Did you calculate the ICA on one data screen (e.g. 10 seconds or 20 seconds), or over the whole data set?<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">If you could send us screen shots showing the ICA wave forms and the accompanying topographies, then we could comment on the classification. (In BESA, you right-click on the label of a component and select “Map topography” to show the topography map of that component.)<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I include my colleague and ICA expert Nicole Ille on CC.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Best regards,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Harald<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><a name="-38992706__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></a></p><p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <a href="mailto:c.andrew123@gmail.com" target="_blank">c.andrew123@gmail.com</a> [mailto:<a href="mailto:c.andrew123@gmail.com" target="_blank">c.andrew123@gmail.com</a>] <b>On Behalf Of </b>Andrew Chang<br><b>Sent:</b> 17 January 2016 19:57<br><b>To:</b> <a href="mailto:Harald.Bornfleth@besa.de" target="_blank">Harald.Bornfleth@besa.de</a>; FieldTrip discussion list <<a href="mailto:fieldtrip@science.ru.nl" target="_blank">fieldtrip@science.ru.nl</a>><br><b>Subject:</b> Re: [FieldTrip] Comparing ICA methods between toolboxes (BESA vs. Fieldtrip)<u></u><u></u></span></p><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">Hi Dr. Bornfleth,<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Thanks for your reply very much. <u></u><u></u></p></div><div><p class="MsoNormal">I would like to use ICA to remove eye blinks and eye movements, neck movements, as well as cardiac and powerline artifacts. The segment I have is a continuous EEG recording for 10 minutes, which is one block of my experiment including many trials.<u></u><u></u></p></div><div><p class="MsoNormal">Before ICA, the segment have been high-pass (0.3 Hz) and low-pass (100 Hz). The components showing activities around the eyes, the back of the neck, and 60 Hz were removed. As for the cardiac artifact, I it is based on visual inspection on the waveform to see whether it looks like an EKG. <u></u><u></u></p></div><div><p class="MsoNormal">Any further comments are appreciated!<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Best,<u></u><u></u></p></div><div><p class="MsoNormal">Andrew<u></u><u></u></p></div></div><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">On Fri, Jan 15, 2016 at 8:35 AM, Harald Bornfleth <<a href="mailto:Harald.Bornfleth@besa.de" target="_blank">Harald.Bornfleth@besa.de</a>> wrote:<u></u><u></u></p><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm"><div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Dear Andrew,</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Thanks for bringing this up. I can try to shed some light on the ICA method used in BESA Research; however, I can not comment on the implementation in FieldTrip. </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The method behind ICA analysis in BESA Research is the extended infomax ICA algorithm (Lee TW et al.: Independent component analysis using an extended infomax algorithm for mixed sub-Gaussian and super-Gaussian sources. Neural Computation 11(2), 1999, 409-433). This algorithm is very well suited to remove cardiac and powerline artifacts. Depending on the data, it may also be used to remove ocular (blink) and electrode artifacts. To assess whether your artifact removal is trustworthy more information about your processing steps are needed. What types of artifacts are you trying to correct? What segments are you using to determine the artifact topographies and what segments are you finally correcting? </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Best regards,</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Harald</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1f497d">Dr. Harald Bornfleth</span></b><u></u><u></u></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Product Manager BESA Research</span><u></u><u></u></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><b><span lang="DE" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1f497d">BESA GmbH</span></b><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Freihamer Strasse 18</span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">82166 Graefelfing/Germany</span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"><a href="http://www.besa.de" target="_blank">http://www.besa.de</a></span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">E: <a href="mailto:Harald.Bornfleth@besa.de" target="_blank">Harald.Bornfleth@besa.de</a></span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">T: <a href="tel:%2B49%2089%208980%209968" target="_blank">+49 89 8980 9968</a></span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">HRB Munich 109956</span><u></u><u></u></p><p class="MsoNormal"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">CEO: Dr. Tobias Scherg, CFO: Theodor Scherg</span><u></u><u></u></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Director of Research: Dr. Michael Scherg</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><a name="-38992706_-464761129__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></a><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm"><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"> <a href="mailto:fieldtrip-bounces@science.ru.nl" target="_blank">fieldtrip-bounces@science.ru.nl</a> [<a href="mailto:fieldtrip-bounces@science.ru.nl" target="_blank">mailto:fieldtrip-bounces@science.ru.nl</a>] <b>On Behalf Of </b>Andrew Chang<br><b>Sent:</b> Sonntag, 10. Januar 2016 21:18<br><b>To:</b> <a href="mailto:fieldtrip@science.ru.nl" target="_blank">fieldtrip@science.ru.nl</a><br><b>Subject:</b> [FieldTrip] Comparing ICA methods between toolboxes (BESA vs. Fieldtrip)</span><u></u><u></u></p></div><div><div><p class="MsoNormal"> <u></u><u></u></p><div><p class="MsoNormal"><span lang="DE">Dear Fieldtrip users,</span><u></u><u></u></p><div><p class="MsoNormal"><span lang="DE"> </span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE">I am wondering whether anyone has compared the performances of the ICA methods among M/EEG toolboxes. Especially, how is the performance of ICA in BESA Research 6.0, compared to Fieldtrip?</span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE">I have an EEG data set which has been processed in BESA, including removing artifact using ICA. I am wondering whether I can trust it, or I should reprocess it in Fieldtrip. Any comments will be appreciated!</span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE"> </span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE">Happy new year!</span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE"> </span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE">Best,</span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE">Andrew</span><u></u><u></u></p></div><div><div><p class="MsoNormal"><span lang="DE"> </span><u></u><u></u></p></div><p class="MsoNormal"><span lang="DE">-- </span><u></u><u></u></p><div><div><div><div><p class="MsoNormal"><span lang="DE" style="color:#666666">Andrew Chang<br>Ph.D. Candidate<br>Auditory Development Lab</span><u></u><u></u></p><div><p class="MsoNormal"><span lang="DE" style="color:#666666">Department of Psychology, Neuroscience & Behaviour<br>McMaster University</span><u></u><u></u></p></div><div><p class="MsoNormal"><span lang="DE"><a href="http://changa5.wordpress.com/" target="_blank">http://changa5.wordpress.com/</a></span><u></u><u></u></p></div></div></div></div></div></div></div></div></div></div></div><p class="MsoNormal"><br>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl" target="_blank">fieldtrip@donders.ru.nl</a><br><a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><u></u><u></u></p></blockquote></div><p class="MsoNormal"><br><br clear="all"><u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><p class="MsoNormal">-- <u></u><u></u></p><div><div><div><div><p class="MsoNormal"><span style="color:#666666">Andrew Chang<br>Ph.D. Candidate<br>Auditory Development Lab</span><u></u><u></u></p><div><p class="MsoNormal"><span style="color:#666666">Department of Psychology, Neuroscience & Behaviour<br>McMaster University</span><u></u><u></u></p></div><div><p class="MsoNormal"><a href="http://changa5.wordpress.com/" target="_blank">http://changa5.wordpress.com/</a><u></u><u></u></p></div></div></div></div></div></div></div></div></div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><font color="#666666">Andrew Chang<br>Ph.D. Candidate<br>Auditory Development Lab</font><div><font color="#666666">Department of Psychology, Neuroscience & Behaviour<br>McMaster University</font></div><div><a href="http://changa5.wordpress.com/" target="_blank">http://changa5.wordpress.com/</a><font color="#666666"><br></font></div></div></div></div></div>
</div>