<div dir="ltr"><div><span style="font-size:12.8px">---------- Mensaje reenviado ----------</span><br style="font-size:12.8px"><span style="font-size:12.8px">From: Makoto Miyakoshi <<a href="mailto:mmiyakoshi@ucsd.edu">mmiyakoshi@ucsd.edu</a>></span><br style="font-size:12.8px"><span style="font-size:12.8px">To: Fang-Yu Chang <<a href="mailto:hardheard101@gmail.com">hardheard101@gmail.com</a>>, EEGLAB List <<a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a>></span><br style="font-size:12.8px"><span style="font-size:12.8px">Cc: </span><br style="font-size:12.8px"><span style="font-size:12.8px">Date: Wed, 13 Apr 2016 12:25:54 -0700</span><br style="font-size:12.8px"><span style="font-size:12.8px">Subject: Re: [Eeglablist] Re-referrence to average and add Cz back</span><br style="font-size:12.8px"><div dir="ltr" style="font-size:12.8px">Dear Fang-Yu,<div><br></div><div><div>> If I would like to add Cz back with computing average, should I operate " 're-reference'-> 'Compute average reference' with 'add current reference channel back to the data' ?"<br></div><div><br></div><div>Compute average reference first and then interpolate Cz next.</div><div><br></div><div>> I would like to ask more question. You mentioned one(any) channel need to be discarded after computing average. How do I discard one channel? I operated " 'Edit' -> 'Channel locations' -> 'delete channel' " by EEGLAB, but it didn't work. I'm not sure it is right to operate like this.<br></div><div><br></div></div><div>Yes this is confusing. Sorry for that. What you need to do is to 'Select data' and not channel editing. Select a channel to discard from the list, check the box to perform rejection for the selected (otherwise it'll leave the selected).</div><div><br></div><div>Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 12, 2016 at 11:44 PM, Fang-Yu Chang <span dir="ltr"><<a href="mailto:hardheard101@gmail.com" target="_blank">hardheard101@gmail.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 dir="ltr">Dear Makoto,<div><br></div><div>Thanks for your reply. I think I just confused with adding Cz back and interpolating Cz, and Cz dose exist in my dataset. </div><div>If I would like to add Cz back with computing average, should I operate " 're-reference'-> 'Compute average reference' with 'add current reference channel back to the data' ?"</div><div><br></div><div>I would like to ask more question. You mentioned one(any) channel need to be discarded after computing average. How do I discard one channel? I operated " 'Edit' -> 'Channel locations' -> 'delete channel' " by EEGLAB, but it didn't work. I'm not sure it is right to operate like this.</div><div>Thanks for your help in advanced.<br></div><div><br></div><div>Sincerely,</div><div>Fang-Yu Chang</div></div></blockquote></div></div></div></div><div><br></div><div><br></div><div>Hello EEGLab list:</div><div><br></div><div>I still have some confusion regarding Re-referrencing to average and adding Cz back for an EGI system. </div><div><br></div><div>1) There seem to be two options - interpolation using pop_interp and the checkbox to "add ref channel back to data" using pop_reref. They produce different results when used:</div><div><br></div><div><div><a href="https://onedrive.live.com/redir?resid=A1398B0A4C8F85DE!2206&authkey=!AMJUTORsc9y3ao4&v=3&ithint=photo%2cpng">https://onedrive.live.com/redir?resid=A1398B0A4C8F85DE!2206&authkey=!AMJUTORsc9y3ao4&v=3&ithint=photo%2cpng</a><br></div></div><div><br></div><div>It seems from the discussion here that interpolation after rereferencing is the correct option - I assume because these functions differ in how they calculate Cz? </div><div><br></div><div>2) After interpolation I receive the following message: "Warning: some channels have the same label." Checking the chanlocs struct there are now two Cz entries, one marked as a data channel and one not. Is this a problem? Should I delete the non - data Cz? When importing channel locations for our 64 channel system, there are 68 values in chanlocs; after interpolation there are 69.</div><div><br></div><div><br></div><div>3) When interpolating Cz, do I need to have a dataset with Cz from the same subject or can it be any dataset with Cz? Do I have to manually edit pop_chanedit to get Cz in a dataset? I have been using datasets from the same subject, but this issue has made me question that. </div><div><br></div><div><br></div><div><br></div><div>Thank you in advance, <br clear="all">-- <br><div class="gmail_signature"><div dir="ltr">Isaiah Innis<br>Indiana University '13<br>EEG Technician, IUB IRF<br><br></div></div>
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