<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Michael,<div class=""><br class=""></div><div class="">This is usually not necessary. Some data will be overrepresented but this does not break ICA. If you are concerned about that, extract shorter data epochs, apply ICA and then use the ICA decompotion in the original dataset (it is possible to do that in menu item Edit > Dataset Info).</div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">Arno</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 19, 2015, at 11:55 AM, Makoto Miyakoshi <<a href="mailto:mmiyakoshi@ucsd.edu" class="">mmiyakoshi@ucsd.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class="">Dear Michael,<div class=""><br class=""></div><div class="">Let's say you have stimulus presentation every 1 second.</div><div class="">When you epoch data, epoch it to -1 to 2 sec (Dataset A) and 0 to 1 sec (Dataset B). You thoroughly clean Dataset B for ICA. When done, copy ica weight matrix from Dataset B to Dataset A (you can do it using GUI) and run dipfit. If necessary, clean Dataset A mildly.</div><div class=""><br class=""></div><div class=""><span style="font-family: 'Times New Roman', Times, serif; font-size: 16px;" class="">> putting the epochs back after ICA?</span><br class=""></div><div class=""><br class=""></div><div class="">This is technically feasible but complicated. I don't recommend it unless you have special reason to do it.</div><div class=""><br class=""></div><div class="">If you are interested developing your own tool outside EEGLAB, I'd like to point you to one of my plugins ARfitStudio in which I use mcolon() to crop out and put back epochs efficiently.</div><div class=""><br class=""></div><div class="">Makoto</div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Wed, Jun 17, 2015 at 4:06 PM, Michael Spezio <span dir="ltr" class=""><<a href="mailto:mspezio@scrippscollege.edu" target="_blank" class="">mspezio@scrippscollege.edu</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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<div style="font-size: 12pt; font-family: 'Times New Roman', Times, serif; background-color: rgb(255, 255, 255);" class=""><p class="">Hi Makoto,</p><p class=""><br class="">
</p><p class="">Do you have an efficient way of removing data redundancies that are due to overlapping epochs prior to ICA, and then putting the epochs back after ICA? I noticed that in your pipeline, you say that overlapping epochs are fine but they must be handled to
avoid redundancy prior to ICA.</p><p class=""><br class="">
</p><p class="">How best to do this so that one can add back the required epochs following ICA?</p><p class=""><br class="">
</p><p class="">Thanks for your help with this.<br class="">
</p><p class=""><br class="">
</p><p class="">Best,</p><p class=""><br class="">
</p><p class="">Michael<br class="">
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