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<p class="MsoNormal">Hello <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I use BioSemi ActiTwo System 64 electrodes + 6 additional channels (EOG1 -> EOG6), i.e., 2 horizontal eye channels, 2 vertical eye channels and 2 mastoid channels in order to record EEG data in the domain of ERP research about language
learning, focusing mainly on N400 and P600 components.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After having ran a pilot study, I have some questions.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When adding channel locations, EEGLAB does not seem to be able to add channel locations to the six EOG channels. However, they are labeled/recognized correctly in the channel plots etc. Is this a detrimental issue for subsequent preprocessing
of EEG, e.g., for ICA analysis? So far, I added the four eye channels in the ICA, ignored the warning message, but now, I doubt whether that was correct practice ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>BioSemi does not require a reference choice for recording data. However, EEGLAB requires to choose a reference channel when importing data. Is the choice of this channel completely “free”. In other words, does it make a difference whether
I choose Cz, Pz ,the left mastoid or any other channel for importing data ?Or is it better not to choose a reference channel for importing data that is a site of interest, e.g., Cz in the case language-related experiments. In both cases, I will anyhow re-reference
to the average of scalp channels in order to follow research practice in my domain.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for your advice on both issues,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Bert<o:p></o:p></p>
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