<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Dear Xiaoxi,</div><div><br></div><div>This can be achieved very easily using the Channel Operations tool in ERPLAB Toolbox (<a href="http://erpinfo.org/erplab">erpinfo.org/erplab</a>), which plugs into EEGLAB and can operate either on EEG or on averaged ERPs. Specific instructions can be found at the end of the following manual page: <a href="http://erpinfo.org/erplab/erplab-documentation/erplab-manual/Bin_Operations.htm">http://erpinfo.org/erplab/erplab-documentation/erplab-manual/Bin_Operations.htm</a></div><div><br></div><div>Steve Luck</div><div><br></div><div><br><blockquote type="cite"><br><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>From: </b></span><span style="font-family:'Helvetica'; font-size:medium;">Xiaoxi Chen <<a href="mailto:nancy.chen.psy@gmail.com">nancy.chen.psy@gmail.com</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>Date: </b></span><span style="font-family:'Helvetica'; font-size:medium;">December 27, 2010 6:33:50 PM PST<br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>To: </b></span><span style="font-family:'Helvetica'; font-size:medium;"><a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(127, 127, 127, 1.0);"><b>Subject: </b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>[Eeglablist] channel location problem: ipsilateral and contralateral question</b><br></span></div><br><br><p>Dear all,</p>
<div>My visual stimuli was presented on either <strong>left</strong> visual field or <strong>right</strong> visual field, so I had to label channel locations on the <strong>ipsilateral </strong>and <strong>contralateral </strong>sides, and then average the contralateral side of both left presented stimuli and right presented stimuli (the same with ipsilateral side of both left presented stimuli and right presented stimuli ). Here I got a question:</div>
<div> </div>
<div>How can this be done in EEGlab? </div>
<div> </div>
<div>I tried to isolate left and right stimuli into <strong>two single datasets</strong> and load different channle location files separately, but I had to <strong>append</strong> these two datasets to draw Sum/Compare ERP waves. While how does EEGlab append several datasets- based on the <strong>number</strong> of channel location, or the <strong>name</strong> of channel location? If these two datasets had different channel location file, then the appended dataset would not have an unnified channel location. How to solve this problem. </div>
<div>And how does "Sum/Compare ERP waves" draw waves - based on number of channel location, or the name of channel location?</div>
<div> </div>
<div>Can you give some suggestions?</div>
<div> </div>
<div>Thanks for your time.</div>
<div><br> </div>
<div>regards,<br>-- <br>Xiaoxi Chen,<br></div>
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