<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Dear Makoto:</div><div><br></div><div>Thank you for your reply.</div><div><br></div><div>I've studied your pipeline and ICA FAQ. I think I know what to do next. :)</div><div><br></div><div>Best,</div><div>Li Xiang<br><br><br></div><div><br>在 2015年9月18日，10:40，Makoto Miyakoshi <<a href="mailto:mmiyakoshi@ucsd.edu">mmiyakoshi@ucsd.edu</a>> 写道：<br><br></div><blockquote type="cite"><div><div dir="ltr">Dear Li,<div><br></div><div><span style="font-family:verdana;font-size:13.3333330154419px">> But, for the third question, I am still confused that whether it is ok for ica using interpolated data. Could you please explain whether there is difference in ica results between interpolated and uninterpolated data?</span><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Channel interpolated data are not full ranked i.e. some of the channels are just combination of others so do not carry unique information. ICA may be confused if it regards the interpolated data as full-rank... and we confirmed that in some cases it does cause problems, such as 'ghost ICs' which you can find here</div><div class="gmail_extra"><a href="http://sccn.ucsd.edu/wiki/Makoto's_preprocessing_pipeline#Re-reference_the_data_to_average">http://sccn.ucsd.edu/wiki/Makoto's_preprocessing_pipeline#Re-reference_the_data_to_average</a><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Sep 12, 2015 at 1:27 AM, <a href="mailto:lxraplikelx@qq.com">lxraplikelx@qq.com</a> <span dir="ltr"><<a href="mailto:lxraplikelx@qq.com" target="_blank">lxraplikelx@qq.com</a>></span> wrote:<br><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"><div>
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<div><br></div><div><span><div style="margin:10px;font-family:verdana;font-size:10pt">Dear Nima & Makoto</div><div style="margin:10px;font-family:verdana;font-size:10pt">Thanks for the kind help!</div><div style="margin:10px;font-family:verdana;font-size:10pt">Yeah, I thought it would be no big problem if I use merged dataset before PREP pipeline.</div><div style="margin:10px;font-family:verdana;font-size:10pt">But, for the third question, I am still confused that whether it is ok for ica using interpolated data. Could you please explain whether there is difference in ica results between interpolated and uninterpolated data?</div><div style="margin:10px;font-family:verdana;font-size:10pt">Thank you for your time! </div><div style="margin:10px;font-family:verdana;font-size:10pt">Li Xiang</div></span></div>
<blockquote style="margin-top:0px;margin-bottom:0px;margin-left:0.5em"><div><br></div><div style="border-style:solid none none;border-top-color:rgb(181,196,223);border-top-width:1pt;padding:3pt 0cm 0cm"><div style="padding:8px;font-size:12px;font-family:tahoma;color:rgb(0,0,0);background:rgb(239,239,239)"><div><b>From:</b> <a href="mailto:nima.bigdely@syntrogi.com" target="_blank">Nima Bigdely Shamlo</a></div><div><b>Date:</b> 2015-09-12 06:21</div><div><b>To:</b> <a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">Makoto Miyakoshi</a></div><div><b>CC:</b> <a href="mailto:lxraplikelx@qq.com" target="_blank">lxraplikelx@qq.com</a>; <a href="mailto:eeglablist@sccn.ucsd.edu" target="_blank">eeglablist</a></div><div><b>Subject:</b> Re: [Eeglablist] PREP pipeline & boundary events</div></div></div><div><div class="h5"><div><div><div dir="ltr">Dear Li<div><br></div><div><div style="font-size:12.8px">(i) You could, especially if the data a few seconds before/after the boundary event is not that important.</div><div style="font-size:12.8px">(ii) No (at least major) problems.</div><div style="font-size:12.8px">(iii) No, since each dataset will be interpolated to have the original number of channels (bad channels replaced by interpolated ones). You will have the same number of channels in all blocks. You will only need to do a 'pca' to the rank of the merged data (in double precision) befoe doing the ICA. </div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">-Nima</div><br><br><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 9, 2015 at 6:34 PM, Makoto Miyakoshi <span dir="ltr"><<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.edu</a>></span> wrote:<br><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"><div dir="ltr">Dear Nima,<div><br></div><div>Here is a question for you about the PREP pipeline. Would you mind helping him?</div><div><br></div><div>Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 4, 2015 at 5:20 AM, <a href="mailto:lxraplikelx@qq.com" target="_blank">lxraplikelx@qq.com</a> <span dir="ltr"><<a href="mailto:lxraplikelx@qq.com" target="_blank">lxraplikelx@qq.com</a>></span> wrote:<br><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"><div>
<div><span></span><span>Dear eeglablist<br><br>I get into <b>an awkward situation using PREP pipeline</b>. The raw datasets I am dealing with are stored separately based on blocks. Firstly, I merged them up for every subject. Then I used PREP pipeline without ignoring boundary event. Since PREP does respect boundary events which represent discontinuities in dataset, PREP skiped all procedures. <br><br>SO, the situation is that </span></div><div><span>(i)when using merged dataset, whether should I just ignore boundary events or not? </span></div><div><span>(ii)If I truely ignoring boundary events and run PREP, is there any problem? </span></div><div><span>(iii)If I do not merge dataset and use datasets of single block, it will very likely lead to inconsistent number of channels in dataset of subject level due to different number of bad channels, and that will not be legitimate in the downstream behavior like ICA. </span></div><div><span><br>What should I do? </span></div><div><span><br></span></div><div><span>Thank you!</span></div><div><span><br>Best!<br>Li Xiang</span></div>
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</div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div></div>
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