Hi Steve,<div><br></div><div>I have just done what you said, and when I plot the data, the signal in the right mastoid electrode is turned to a flat line. It seems that all of the data was re-referenced only to this channel. If I try "add current reference channel to the data", I get the error message again (there are no reference channels)...</div>
<div><br></div><div>Do you know if there is a way to export the data already re-referenced from the BrainVision analyzer? Now I am trying the analysis using the raw data.</div><div><br></div><div>Thank you very much once again.</div>
<div><br></div><div>Best,</div><div>Ricardo</div><div><br><div class="gmail_quote">On 24 September 2012 23:59, Stephen Politzer-Ahles <span dir="ltr"><<a href="mailto:politzerahless@gmail.com" target="_blank">politzerahless@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Ricardo,<br><br>If I'm understanding correctly, you should be able to get the average mastoid by choosing right mastoid as your reference and selecting "retain old reference channels". This should average together the right mastoid with the current reference (the left mastoid) and compute a new reference based on that average. <br>
<br>Best,<br>Steve<div class="HOEnZb"><div class="h5"><br><br><div class="gmail_quote">On Mon, Sep 24, 2012 at 9:39 PM, Ricardo Moura <span dir="ltr"><<a href="mailto:ricardoojm@gmail.com" target="_blank">ricardoojm@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<div>Thanks for your answer.</div><div>The reference channels were recorded at the left (recording reference) and right (recorded as a normal eeg channel) mastoids. The right reference is available when I open the data in EEG lab, but not the recording reference. The reference channel always appear as "unknown" at the main eeglab window, and when I go to the "channel locations", it only shows me 64 electrodes (the 65th electrode, which would be the recording reference, is missing). This is a problem because I need this channel in order to re-reference the data to linked-ears (don't I?). But I don't need to use it as an active electrode. </div>
<div><br></div><div>So when I try the
"Add current reference channel back into the data" , I allways have the following message: "there are no reference channel defined, add it using the channel locations".</div><div><br></div><div><br></div>
<div>Any idea about how to recover this channel (in case I really need it to perform the linked-ears reference)?</div><div><br></div><div>Best,</div><div>Ricardo</div><div><div><div><br><br><div class="gmail_quote">
On 24 September 2012 14:50, Stephen Politzer-Ahles <span dir="ltr"><<a href="mailto:politzerahless@gmail.com" target="_blank">politzerahless@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Ricardo,<br><br>May I ask what your reference was? In my experience using Brain Vision data, the recording reference (in my case it was on the nose) was just not included in the data that I imported to EEGLAB. This wasn't a problem for me because I wasn't interested in analyzing that electrode anyway after I re-referenced; but it might matter for you if your reference is something that you care about as an active electrode, like Cz. You may be able to get that channel back by using the "Add current reference channel back into the data" command and specifying its location (but I haven't tried that myself with BV).<br>
<br>Best,<br>Steve<br><br><div class="gmail_quote"><div><div>On Mon, Sep 24, 2012 at 8:55 AM, Ricardo Moura <span dir="ltr"><<a href="mailto:ricardoojm@gmail.com" target="_blank">ricardoojm@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>
Dear all,<div><br></div><div>I am new to the EEGLab. Now I am trying to analyze data that were recorded using the BrainVision recorder, but I never find the reference electrode. Going to "Channel Locations" only shows me the EEG electrodes. It is a problem for me because I want to re-reference the eeg signal to the linked-ears. The second reference electrode is always there (once it was recorded as a regular eeg electrode), but not the actual reference.</div>
<div><br></div><div>I would appreciate any help,</div><div>Best,</div><div>Ricardo Moura</div>
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