Dear experts,<br>I have a few questions about importing my data into EEGLAB.<br><br>(1) When I import the unreferenced Biosemi data into EEGLAB, either by:<br><br>>File > Import> From BIOSEMI BDF file (BIOSIG toolbox)<br>
OR<br>>File >Import > From BIOSEMI BDF and EDF files (BDF plugin)<br><br>I get the following error in the MATALB command window:<br>
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">We
highly recommend that you choose a reference channel IF these are Biosemi data</span></p>
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">(e.g.,
a mastoid or other channel). Otherwise the data will lose 40 dB of SNR!</span></p>
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">Reading
BDF data in 24-bit format...</span></p>
<br><b>As the BIOSEMI data is recorded unreferenced, what do I do? I may choose to take the common average reference (CAR) in EEGLAB after importation or take the CAR in another program before importing into EEGLAB. What would I do in each case? If I take the CAR prior to importation into EEGLAB, I will not have a channel for the CAR, so there still will be nothing to select. If I import the BIOSEMI data unreferenced, how do I compensate for this warning in the command window?</b><br>
<br>(2) If I am importing BIOSEMI data that is already epoched, how do I proceed? I cannot find this in the online manual. Also, the event markers need to be fixed in the file, so I will be associating a text file to import the markers. I know how to remove markers and to import new event markers. <b>But, how do I proceed with this data that has already been epoched <u>to let EEGLAB know it is epoched</u>? Again, I cannot use the markers in the file. I need to import the markers as an event file. </b><br clear="all">
<b style><u><span style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif""><br></span></u></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">I appreciate any advice you can give me.<br>
Thanks,<br>Ed<br></span><b style><u><span style="font-size:12.0pt;line-height:115%;font-family:"Times New Roman","serif""><br></span></u></b>-- <br>Edward Justin Modestino, Ph.D.<br><br>