<div dir="ltr"><div class="gmail_default" style="color:#333399">Hello Mahsa,</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">You may want to use a 1 Hz bottom for your filter to get better ICA.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">It's probably best to remove any components that are dominated by eye blinks. </div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">I would recommend just sticking with analysis of just the IC components that are valid/neural, and ignoring/discounting the rest.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">If you are rejecting IC components and rebuilding the eeg data: Some researchers try to be extra cautious and they try not to remove ICs that are "mixed", so as not to inadvertantly remove neural signal.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">Note that ICA is not a perfect method, and that there are often ICs that have both artifact and neural signal.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">See Luca's reaching site to get info and training on selecting/reviewing ICs, including a "practice" option that provides feedback about your classification. At minimum, I recommend that students do about 200 classifications, review with an ICA-EEG expert, and then do another 200-300 classifications.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">Remember that you also have to do cleaning before ICA, which does not seem to be one of the steps you listed.</div><div class="gmail_default" style="color:#333399">If you haven't had a chance to yet, please be sure to review the eeglab tutorial steps, practice with with eeglab tutorial data, and check out Makoto's pipeline suggestions.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">If you haven't yet, you should check out the various ICA classification plugins, such as MARA and SASICA, which should help you make a decision on your ICs.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 9, 2017 at 3:54 PM, mahsa shalchy <span dir="ltr"><<a href="mailto:mahsa.shalchy@gmail.com" target="_blank">mahsa.shalchy@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear Experts,<div><br></div><div>I am trying to correct EEG data blinks and saccades using ICA, however, in some cases (i.e. when the subject is double blinking), ICA finds multiple eye related components. </div><div><br></div><div>The problem is that except for the main blink component, other eye contaminated ICs, have neural information and I can not easily discard them ( please find an image of ICs here:</div><div><a href="https://www.dropbox.com/sh/qjz2v3ke6zdr1j1/AABoSzG4s6ZyAlUz_vYC8slsa?dl=0" target="_blank">https://www.dropbox.com/sh/qjz<wbr>2v3ke6zdr1j1/AABoSzG4s6ZyAlUz_<wbr>vYC8slsa?dl=0</a>)</div><div><br></div><div>I tried using PCA before ICA but it didn't seem to work. </div><div><br></div><div>For the preprocessing I did the following steps before applying ICA:</div><div>Resampling, Filtering (0.1-40), re-referencing to average mastoids,epoching.</div><div><br></div><div>I highly appreciate your help on this problem.</div><div><br></div><div>Many thanks,</div><div>Mahsa</div></div>
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