<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Sara, this article and maybe more recent ones from this group might answer your question:<div><br></div><div><a href="http://www.ncbi.nlm.nih.gov/pubmed/15351361">http://www.ncbi.nlm.nih.gov/pubmed/15351361</a></div><div><br></div><div>Best</div><div><br></div><div>Guillaume</div><div><br></div><div><br><div><div>On 29 Jul 2010, at 11:27, Sara Graziadio wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hello everybody,<br>We are setting up an ERP study with high density EEG (128 electrodes). We would like to localize sources from the ERP components and possibly to relate these data with fMRI activations. We would have MRI data of the subjects. We are now in the process of considering the possibility to use the Polhemus to digitalize the electrode positions and we found out that there are no papers (at least that I can find) that compare the accuracy of source localization with high density EEG adding the information about the positions of all the 128 electrodes, or of just a part of them (for example 30 evenly spread on the scalp and including some of the more external positions), or just using the standard 10-10 system locations. Does anybody of you have any thoughts about it? Have you had ever tried to compare the 3 options I have described? <br>Thank you very much<br><br>Best wishes<br><br>Sara Graziadio, PhD<br>Research Associate<br>Newcastle University<br><br><br><br><br>_______________________________________________<br>Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a><br>To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</a><br>For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a><br></div></blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="font-size: 18px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br class="Apple-interchange-newline">************************************************************************************</div><b style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: normal; "><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><b style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: bold; ">Guillaume A. Rousselet, Ph.D., l<span class="Apple-style-span" style="font-family: Arial; ">ecturer</span></span></span></span></span></span></span></b></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><br></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial">School of Psychology</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial">Institute of Neuroscience & Psychology</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial">Centre for Cognitive Neuroimaging (CCNi)</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><br></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; ">The University of Glasgow, charity number SC004401</div></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><br class="khtml-block-placeholder"></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><a href="http://www.psy.gla.ac.uk/staff/index.php?id=GAR01">http://www.psy.gla.ac.uk/staff/index.php?id=GAR01</a></font></div></span></b></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><br class="khtml-block-placeholder"></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; ">Email: </span></span></span></span></span></span></span></span></font><a href="mailto:g.rousselet@psy.gla.ac.uk">g.rousselet@psy.gla.ac.uk</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; ">Fax. +44 (0)141 330 4606</span></span></span></span></span></span></span></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; ">Tel. </span></span></span></span></span></span></span></span></font><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; ">+44 (0)141 330 </span></span></span></span></span><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; ">6652</span></span></span></span></span></span></span></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; ">Cell +44 (0)</span></span></span></font>791 779 7833</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br class="khtml-block-placeholder"></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><font class="Apple-style-span" color="#0000EF"><b style="color: rgb(0, 0, 239); font-weight: bold; "><br class="khtml-block-placeholder"></b></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><i style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; ">"</span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="Apple-style-span" style="font-style: normal; ">For reasons I wish I understood, the spectacle of sync strikes a chord in us, somewhere deep in our souls. It's a wonderful and terrifying thing. Unlike many other phenomena, the witnessing of it touches people at a primal level. Maybe we instinctively realize that if we ever find the source of spontaneous order, we will have discovered the secret of the universe.</span></span></i>"</div><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><span class="Apple-converted-tab"> </span><br class="khtml-block-placeholder"></p><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><span class="Apple-converted-tab"><span class="Apple-tab-span" style="white-space: pre; "><span class="Apple-style-span" style="white-space: pre; "> </span></span>Steven Strogatz -<span class="Apple-converted-space"> </span><i style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; "><span class="Apple-style-span" style="font-style: italic; ">Sync</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></i><span class="Apple-converted-space"> </span>- 2003</span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">************************************************************************************</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br class="khtml-block-placeholder"></div><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline"></span> </div><br></div></body></html>