<div dir="ltr"><div><div><div>Dear Matthias,<br></div>I have never seen such artifacts, but if you are working with patients with Parkinson's, have you checked if they have deep brain stimulation devices? Maybe that is causing the artifacts in the data?<br></div>best,<br></div>Marcin<br></div><br><div class="gmail_quote"><div dir="ltr">śr., 28 lis 2018 o 16:11 Blume Christine <<a href="mailto:christine.blume@sbg.ac.at">christine.blume@sbg.ac.at</a>> napisał(a):<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Dear Matthias,<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 lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Admittedly, I do not know what this could be. While the first step should of course be to find the source and eliminate
this (any devices in the EEG lab, artefact from the acoustic stimulation/headphones, …), in case you are unable to find it, you could remove the component(s) that correspond to the artefact. But as I said, the first goal should always be to record clean data…<u></u><u></u></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Best,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Christine<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span lang="DE" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Von:</span></b><span lang="DE" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> fieldtrip <<a href="mailto:fieldtrip-bounces@science.ru.nl" target="_blank">fieldtrip-bounces@science.ru.nl</a>>
<b>Im Auftrag von </b>"Matthias Möller"<br>
<b>Gesendet:</b> Mittwoch, 28. November 2018 15:16<br>
<b>An:</b> <a href="mailto:fieldtrip@science.ru.nl" target="_blank">fieldtrip@science.ru.nl</a><br>
<b>Betreff:</b> [FieldTrip] Spike artifacts in EEG, 7-12Hz<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Dear all, <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">my name is Matthias and I am relatively new to the field of EEG analysis. I'm currently carrying out a study on the effects of natural sounds on the quantitative EEG in patients
with Parkinson's disease at the universities of Vanvouver and Marburg. <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Right now I'm experiencing these weird artifacts as seen in the screenshot. It's sharp spikes, looking similar to ECG artifacts, but in frequencies of 7-12Hz. <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">They are also showing up in the independent components after ICA as well. <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">The recording was done at a sampling rate of 500 Hz, I've applied a Band-Pass filter from 1-249Hz and two notch filters, 60 and 120 Hz (recording took place in Canada). <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Has anyone seem similar artifacts before and maybe even knows how to get rid of them?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Many thanks in advance and all the best,<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Matthias<u></u><u></u></span></p>
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