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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear Casper and Tineke,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">As voltage is always the difference between the reference and an electrode, voltages are lowest for electrodes closest to the reference electrode.
You could check where voltages are minimal across trials and for each participant. If then for example that is close to Cz, it is likely that data were referenced to the vertex. Just an idea, it might work…but perhaps someone else has a better idea?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Christine<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> fieldtrip-bounces@science.ru.nl [mailto:fieldtrip-bounces@science.ru.nl]
<b>Im Auftrag von </b>Casper van Heck<br>
<b>Gesendet:</b> Mittwoch, 21. September 2016 14:25<br>
<b>An:</b> fieldtrip@science.ru.nl<br>
<b>Betreff:</b> [FieldTrip] Lost reference location<o:p></o:p></span></p>
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<p class="MsoNormal">Dear all,<o:p></o:p></p>
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<p class="MsoNormal">We've recently started working on an old dataset, but have ran into a problem; nobody bothered to write down where the reference was placed... Does anybody have ideas on how to reconstruct the location of the reference, based on (some aspect
of) the data? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Casper van Heck and Tineke van Rijn<o:p></o:p></p>
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