Dear Stephanie,<div><br></div><div><div><font face="tahoma, sans-serif">>1) When importing data, to choose a reference, another user on the list suggested just choosing a scalp electrode like Cz. However, I didn't record from the scalp (we use BioSemi equipment and Actiview for recording. It keeps 32 scalp channels even though nothing is recorded). Should I just enter a blank reference anyway? For example, choosing Cz even though nothing was recorded there? This doesn't make sense to me but I just need to clarify. </font></div>
<div><font face="tahoma, sans-serif"><br></font></div><div><font face="tahoma, sans-serif">Probably you don't need to enter anything there. Just import the data and run average reference (which subtracts the mean of your two channels from each channel's data).</font></div>
<div><font face="tahoma, sans-serif"><br></font></div><div><font face="tahoma, sans-serif">>2) I record from two flat electrodes at each site for biploar recording. I need to take the difference in their waveforms, but can't find how to do this in eeglab (for example, create a "new" channel by subtracting channel 34 from channel 33) </font></div>
<div><font face="tahoma, sans-serif"><br></font></div><div><font face="tahoma, sans-serif">Try this: suppose you have channel 1 and channel 2 and perform ch1-ch2 and store the result to ch1,</font></div><div><font face="tahoma, sans-serif"><br>
</font></div><div><font face="tahoma, sans-serif">EEG.data(1,:) = EEG.data(1,:)-EEG.data(2,:);</font></div><div><font face="tahoma, sans-serif">Just in case, save the dataset immediately after this process and load the data for further analysis.</font></div>
<div><font face="tahoma, sans-serif"><br></font></div><div>><span style="font-family:tahoma,sans-serif">3) How to rectify data? I found this suggestion: </span><span style="font-family:tahoma,sans-serif;color:rgb(34,34,34);white-space:pre-wrap">EEG.data = abs(EEG.data) but if anyone can confirm that this works let me know.</span></div>
<div><br></div><div>Yes it should work. Type 'help abs' and you'll find more explanation.</div><div><br></div><div>Makoto</div><br><div class="gmail_quote">2013/3/8 Stephanie Chen <span dir="ltr"><<a href="mailto:sdeochen@umich.edu" target="_blank">sdeochen@umich.edu</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font face="tahoma, sans-serif">Hi everyone,</font><div><font face="tahoma, sans-serif"><br></font><div><font face="tahoma, sans-serif">I've been trying to learn how to use eeglab for facial EMG work alone (no scalp recordings) and I've hit a few spots where I can't seem to find any answers. Please reply if you can help with any of the items below (or if you have any training resources that you can pass along)</font></div>
<div><font face="tahoma, sans-serif"><br></font></div><div><font face="tahoma, sans-serif">1) When importing data, to choose a reference, another user on the list suggested just choosing a scalp electrode like Cz. However, I didn't record from the scalp (we use BioSemi equipment and Actiview for recording. It keeps 32 scalp channels even though nothing is recorded). Should I just enter a blank reference anyway? For example, choosing Cz even though nothing was recorded there? This doesn't make sense to me but I just need to clarify. </font></div>
<div><font face="tahoma, sans-serif">2) I record from two flat electrodes at each site for biploar recording. I need to take the difference in their waveforms, but can't find how to do this in eeglab (for example, create a "new" channel by subtracting channel 34 from channel 33) </font></div>
<div><font face="tahoma, sans-serif">3) How to rectify data? I found this suggestion: <span style="color:rgb(34,34,34);white-space:pre-wrap">EEG.data = abs(EEG.data) but if anyone can confirm that this works let me know.</span></font></div>
<div><font face="tahoma, sans-serif"><span style="color:rgb(34,34,34);white-space:pre-wrap"><br></span></font></div><div><font face="tahoma, sans-serif"><span style="color:rgb(34,34,34);white-space:pre-wrap">Thank you very much!!</span></font></div>
<span class="HOEnZb"><font color="#888888">
<div><font face="tahoma, sans-serif"><span style="color:rgb(34,34,34);white-space:pre-wrap">Stephanie</span></font></div><div><br></div><div><br></div></font></span></div>
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-- <br>Makoto Miyakoshi<br>JSPS Postdoctral Fellow for Research Abroad<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br>
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