<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Mehmet-</div><div><br></div><div>The polarity conventions in ERP research are arbitrary and partially reflect historical accidents. You can plot negative upward if you mainly want to communicate your results to people who are used to looking at ERPs with negative upward. You should plot positive upward if you mainly want to communicate your results to the 99.999999% of scientists who use the Cartesian convention of plotting positive upward.</div><div><br></div><div>Steve</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;">mehmet ali <<a href="mailto:theretinaguy@gmail.com">theretinaguy@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;">June 16, 2011 5:29:38 AM PDT<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] p300 convention</b><br></span></div><br><br>Hi all,<br><br>p300 is conventionally plotted on an inverted axis( positive potentials to down), is there a reason to end up with this convention?<br><br>Best,<br><br><br>
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