<div dir="ltr">Dear Makoto,<div><br></div><div>Thank you for your advice. I actually tried emailing the ERPLAB list after emailing the EEGLAB list and got a helpful response from Steve Luck. So I don't think my email to the EEGLAB list needs to go out anymore. </div><div><br></div><div>Best wishes,</div><div>Elizabeth</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 8 December 2016 at 02:52, Makoto Miyakoshi <span dir="ltr"><<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear Elizabeth,<div><br></div><div>While waiting for other experts in this list write you back, why don't you write to ERPLAB mailing list too if you haven't.</div><div><a href="http://erpinfo.org/erplab/erplab-email-list" target="_blank">http://erpinfo.org/erplab/<wbr>erplab-email-list</a><br></div><div><br></div><div>Personally I have no experience with it so I can't help you, sorry. I hope other researchers here can help you.</div><div><br></div><div>Makoto</div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Dec 5, 2016 at 11:52 AM, Elizabeth J Kirkham <span dir="ltr"><<a href="mailto:ekirkham1@sheffield.ac.uk" target="_blank">ekirkham1@sheffield.ac.uk</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Dear all,<div><br></div><div>I am using the area under the curve methodology to measure my ERP waveforms. To do this, I am using ERPLAB's Measurement tool function, with the settings "Numerical Intergration/Area between two fixed latencies", "Rectified area (negative values become positive)".</div><div><br></div><div>I want to examine the waveform over two clusters of electrodes (P5, P7 and TP7; and P6, P8 and TP8). </div><div><br></div><div>There are two ways for me to examine these clusters, either (1) create the cluster in ERPLAB (ERPLAB > ERP operations > ERP channel operations), and then use the Measurement tool to find the Numerical Integration values for the cluster, or (2) use the Measurement tool to find the Numerical Integration values for each electrode separately, and then average them together later (for example in Excel). </div><div><br></div><div>I have found that these measures produce different output values. The values are not the same in absolute terms, or in relative terms. (For example, the values for one participant in conditions 1 and 2 are 0.523 and 0.630 using the first method, and 1.698 and 1.641 using the second method.)</div><div><br></div><div>I don't know if these different values are because I have made a mistake, or if differences in output are to be expected when using numerical integration?</div><div><br></div><div>If it is the case that I have not made a mistake, is there a best practice in terms of which way round to carry out the procedures? Should I average the channels in ERPLAB, and then take the measurement, or take the measurement for each channel separately, and then average the output together?</div><div><br></div><div>Thanks in advance,</div><div>Elizabeth</div><span class="m_-8553800389059659320HOEnZb"><font color="#888888"><div><br></div><div><div><br></div>-- <br><div class="m_-8553800389059659320m_8803458767080647052gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div>Elizabeth Kirkham</div><div>PhD Researcher</div><div> </div><div><div>Department of Psychology</div><div>The University of Sheffield</div><div>Floor E</div><div>Cathedral Court</div><div>1 Vicar Lane</div><div>Sheffield</div><div>S1 2LT</div><div>UK</div></div><div><br></div></div></div></div></div></div>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div>Elizabeth Kirkham</div><div>PhD Researcher</div><div> </div><div><div>Department of Psychology</div><div>The University of Sheffield</div><div>Floor E</div><div>Cathedral Court</div><div>1 Vicar Lane</div><div>Sheffield</div><div>S1 2LT</div><div>UK</div></div><div><br></div></div></div></div></div></div>
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