<div dir="ltr">Dear Jerry,<div><br></div><div>Most likely the referenced 'Cz' is not stored as data but computed on the fly as a mean of the other 128ch.</div><div><br></div><div>The 'recovered' reference channel is completely dependent of others and does not add any information; it can even confuses ICA with rank mismatch (i.e. number of channels ~= data rand). So it is generally not recommended in EEGLAB.</div>
<div><br></div><div>Maktoo</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 16, 2014 at 3:31 PM, Jerry Zhu <span dir="ltr"><<a href="mailto:jerryzhu@siu.edu" target="_blank">jerryzhu@siu.edu</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"><div><div><div><div><div><div>Hi all,<br></div>I used net station to export my 128-channel data as .raw format with and without exporting reference channel (which is Cz in my case). That is, I had two .raw files. <br>
<br>Then when I opened them in eeglab, it did not recognize the reference channel as Cz (automatically) for both files. Both files showed they had 128 channels. I expect that the file with the reference channel would show it has 129 channel (with Cz). <br>
<br></div>Next, my head model has location information about Cz, so I declared Cz as my reference channel (through GUI "set reference"). The eeglab main window showed that the reference was set to Cz. But when I plotted the data, the figure did not show Cz. Again I expect the channel number would increase to 129 and the plot would show a flat line indication Cz is the reference channel.<br>
<br></div>Finally, I could add Cz to the data by re-referencing to average (through GUI re-reference | add current reference channel back to data)<br><br></div>Can someone explain this to me?<br></div>Thank you so much for the help!<br>
<br></div><div>Best,<br></div>Jerry<br><div><div><div><div><div><div><div><div><div><div><div dir="ltr"><div><span style="font-family:times new roman,serif">--<br>Jian Zhu, M.A.<br>Brain and Cognitive Sciences<br>Department of Psychology<br>
Southern Illinois University Carbondale<br></span></div><span style="font-family:times new roman,serif">Web: <a href="http://zhupsy.com" target="_blank">http://zhupsy.com</a><br></span><div><span style="font-family:times new roman,serif"><br>
We have two halves in the brain: left and right. Nothing is right in the left. Nothing is left in the right.</span></div></div></div>
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-- <br><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div>
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