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<div>Hi Erika,</div><div> Did you compare the phase differences between short vs long distance electrode locations, e.g., Frontal-occipital vs local parietal-occipital or central-frontal, etc? before and after ICA reconstruction? Are you only interested in amplitude and not phase differences?</div><div><br></div><div>Robert</div><div><br></div><div><br></div><div><br></div><div> between short and long distance electrode locations, for example occipital to central or frontal to parietal </div><div><br></div>
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On Saturday, January 6, , 4:33:46 PM EST, Erika Nyhus <enyhus@bowdoin.edu> wrote:
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<div><div id="ydpeccabfb1yiv4040858861"><div dir="ltr">Hi Tarik and Makoto,<div><br></div><div>All datasets were re-referenced to the average reference and the reference channel was added back to the data so there are 64 channels and no bad channels. I am selecting 63 channels and excluding the reference channel for ICA. All the datasets are from the same subject and have been preprocessed in the same way. I tried running ICA with 64 channels selected and it runs fine. I tried running ICA with the tutorial dataset and selecting 31 channels and get the same error as in my datasets.<div><br></div><div>Erika</div><div class="ydpeccabfb1yiv4040858861gmail_extra"><br><div class="ydpeccabfb1yiv4040858861gmail_quote">On Tue, Dec 26, 2017 at 6:22 PM, Makoto Miyakoshi <span dir="ltr"><<a href="mailto:mmiyakoshi@ucsd.edu" rel="nofollow" target="_blank">mmiyakoshi@ucsd.edu</a>></span> wrote:<br><blockquote class="ydpeccabfb1yiv4040858861gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div dir="ltr">Dear Erika,<div><br></div><div>If EEG.icasphere has 63 x 63 columns, it means ICA was computed on 63 channels. How many channels did you have when you run ICA? Was the data full-ranked (no bridging across channels, no standard re-referencing before ICA)?</div><div><br></div><div>Makoto</div></div><div class="ydpeccabfb1yiv4040858861gmail_extra"><br><div class="ydpeccabfb1yiv4040858861gmail_quote"><span>On Wed, Dec 20, 2017 at 8:28 AM, Erika Nyhus <span dir="ltr"><<a href="mailto:enyhus@bowdoin.edu" rel="nofollow" target="_blank">enyhus@bowdoin.edu</a>></span> wrote:<br></span><div><div class="ydpeccabfb1yiv4040858861m_147050903508982024m_-9196508372056888295h5"><blockquote class="ydpeccabfb1yiv4040858861gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div dir="ltr"><font face="arial, helvetica, sans-serif" color="#000000">I am getting the following error when I run ICA on a concatenated datasets and selecting 63 of 64 channels<span style="white-space:pre-wrap;">.</span> When I run ICA on any of the datasets individually I do not get an error. I was wondering if anyone has run in to this problem and how they were able to solve it.</font><div><font face="arial, helvetica, sans-serif" color="#000000"><br></font></div><div><font color="#000000" face="arial, helvetica, sans-serif">eeg_checkset error: number of elements in 'icachansind' (64) </font></div><div><font color="#000000" face="arial, helvetica, sans-serif">does not match the number of columns in the sphere array (63)</font></div><span class="ydpeccabfb1yiv4040858861m_147050903508982024m_-9196508372056888295m_-2627772378052551374HOEnZb"><font color="#888888"><div><font color="#000000" face="arial, helvetica, sans-serif"><br></font></div><div>-- <br><div class="ydpeccabfb1yiv4040858861m_147050903508982024m_-9196508372056888295m_-2627772378052551374m_-5745033161617361137gmail_signature"><div dir="ltr"><div><div>
Erika Nyhus, Ph.D.<br>Department of Psychology and Program in Neuroscience<div>6900 College Station</div><div>Bowdoin College</div><div>Brunswick, ME 04011<br></div><p><span style="font-size:13pt;"></span></p>
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Erika Nyhus, Ph.D.<br>Department of Psychology and Program in Neuroscience<div>6900 College Station</div><div>Bowdoin College</div><div>Brunswick, ME 04011<br></div><p><span style="font-size:13.0pt;"></span></p>
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