<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="">The EP Toolkit can remap from 256 to 128 using spatial interpolation (<a href="https://sourceforge.net/projects/erppcatoolkit" class="">https://sourceforge.net/projects/erppcatoolkit</a>)</div></div><div class=""><br class=""></div><div class="">Joe</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jul 19, 2017, at 18:56, Tarik S Bel-Bahar <<a href="mailto:tarikbelbahar@gmail.com" class="">tarikbelbahar@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="color:rgb(51,51,153)">Much appreciated Jeff, that should work as ideal solution. It's curious that no one seems to have done it yet. There are a few methodological articles out there that look at subsets of 256 and there relations to 10-5 and other location systems. Yes in my experience 128 to 32, and 64 to 32 is easier to do, and the 256 to 128 is more difficult.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br class=""></div><div class="gmail_default" style="color:rgb(51,51,153)">EGI did not have a working solution/match comparing 128 and 256, but provides the 128 and 256 channel locations, placards, and 256/128 10-10 locations tech note.</div><div class="gmail_default" style="color:rgb(51,51,153)"><br class=""></div><div class="gmail_default" style="color:rgb(51,51,153)">In general, a manual solution is workable if one has the 128 and 256 placards (both on web and from egi support), and the EGI tech note on 10-10 locations of 256 and 128 channels. The placards are easily found googlable and at EGI's knowledge center, which includes the tech note named as below.</div><div class="gmail_default" style="color:rgb(51,51,153)">relating-the-hcgsn-sensor-posi<wbr class="">tions-to-the-10-10-internation<wbr class="">al-electrode-placement-system<br class=""></div><div class="gmail_default" style="color:rgb(51,51,153)"><br class=""></div><div class="gmail_default" style="color:rgb(51,51,153)"><br class=""></div><div class="gmail_default" style="color:rgb(51,51,153)"><br class=""></div><div class="gmail_default" style="color:rgb(51,51,153)"><br class=""></div><div class="gmail_default" style="color:rgb(51,51,153)"><br class=""></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Mon, Jul 17, 2017 at 6:47 PM, K Jeffrey Eriksen <span dir="ltr" class=""><<a href="mailto:eriksenj@ohsu.edu" target="_blank" class="">eriksenj@ohsu.edu</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_7306224153966575493m_-3997269291021604016WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="">My 2 cents worth:<u class=""></u><u class=""></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class=""><u class=""></u> <u class=""></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="">Because of the geodesic (and in general spherical) layout of the electrodes, there is a very nice spatial down-sampling from 256 to 64, or from 128 to 32 (that
is by a factor of 4). Going from 256 to 128 is problematic spatially. If possible I suggest spatially interpolating the 256 channel data to the exact 128 channel locations.<u class=""></u><u class=""></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class=""><u class=""></u> <u class=""></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="">-Jeff Eriksen<u class=""></u><u class=""></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class=""><u class=""></u> <u class=""></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class=""><u class=""></u> <u class=""></u></span></p><p class="MsoNormal"><b class=""><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" class="">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" class=""> eeglablist [mailto:<a href="mailto:eeglablist-bounces@sccn.ucsd.edu" target="_blank" class="">eeglablist-bounces@scc<wbr class="">n.ucsd.edu</a>]
<b class="">On Behalf Of </b>Tarik S Bel-Bahar<br class="">
<b class="">Sent:</b> Sunday, July 16, 2017 2:19 PM<br class="">
<b class="">To:</b> eeglablist<br class="">
<b class="">Cc:</b> Support Team<br class="">
<b class="">Subject:</b> [Eeglablist] EGI 256 to 128 channels ?<u class=""></u><u class=""></u></span></p><div class=""><div class="m_7306224153966575493h5"><p class="MsoNormal"><u class=""></u> <u class=""></u></p>
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<div class=""><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#333399" class="">Greetings,<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal"><span style="color:#333399" class="">Does anyone have (or know of) a list of which EGI 256 hydrocel channels
<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#333399" class="">that match up with the EGI 128 hydrocel channels ?<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal"><span style="color:#333399" class="">We're basically looking for the best possible match,<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal"><span style="color:#333399" class="">and a list of which channels from the 256 layout to keep<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#333399" class="">in order to get as close as possible to the 128 channel layout.<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#333399" class="">Thanks very much for any info that is available!<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal"><span style="color:#333399" class="">PS. we are doing this somewhat manually/visually at this time,<u class=""></u><u class=""></u></span></p>
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<div class=""><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#333399" class="">and we already have access to the 10-10 correspondences tech note from EGI.<br class="">
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_______________________________________________<br class="">Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" class="">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a><br class="">To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu" class="">eeglablist-unsubscribe@sccn.ucsd.edu</a><br class="">For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu" class="">eeglablist-request@sccn.ucsd.edu</a></div></blockquote></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">--------------------------------------------------------------------------------<br class=""><br class="">Joseph Dien, PhD</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Senior Research Scientist</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Maryland Neuroimaging Center</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">University of Maryland, College Park</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><a href="http://joedien.com" class="">http://joedien.com</a></div></div></div></div>
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