Dear All,<div><br></div><div>Would it be the craziest idea you've ever heard if I were to suggest you just get a tape measure, place an electrode cap on a head, and measure the inter-electrode distances?!</div><div><br>
</div><div>Simon</div><div><br><br><div class="gmail_quote">On Tue, Dec 18, 2012 at 7:25 PM, Iman M.Rezazadeh <span dir="ltr"><<a href="mailto:irezazadeh@ucdavis.edu" target="_blank">irezazadeh@ucdavis.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks Tim for your response ! and your two cents: ) <u></u><u></u></span></p>
<p style="text-align:justify"><u></u><span style="font-size:11.0pt;font-family:Symbol;color:#1f497d"><span>·<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span dir="LTR"></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Ok let me be clear. If we have electrode location file and fit anatomical head model ( not spherical ) the results will different . So, my question is “ <span style="background:yellow">Is there ANY ANATOLICAL MODEL based on the electrode locations/labels that can help us to measure the inter-electrode distance?”</span> I have done a test over 3 different individual scalp and there is +/- 4 cm difference between using spherical model and real head on average.<u></u><u></u></span></p>
<p style="text-align:justify"><u></u><span style="font-size:11.0pt;font-family:Symbol;color:#1f497d"><span>·<span style="font:7.0pt "Times New Roman""> </span></span></span><u></u><span dir="LTR"></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Best,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Iman<u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Tim Mullen [mailto:<a href="mailto:mullen.tim@gmail.com" target="_blank">mullen.tim@gmail.com</a>] <br>
<b>Sent:</b> Tuesday, December 18, 2012 1:04 AM<br><b>To:</b> Iman M.Rezazadeh<br><b>Cc:</b> Makoto Miyakoshi; UCSD EEG List<br><b>Subject:</b> Re: Inter-Electrode Distance<u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p>
<div><p class="MsoNormal">No worries, Iman -- just my two cents :) The email mailing list format is also not the easiest format to search and follow up on old posts. But I do think it helps reduce everyone's inbox clutter (and likely ensures you get a faster/better response) if new posts make clear how the given problem is not addressed by previously posted solutions.<u></u><u></u></p>
<div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">In the 2010 thread Arno describes a solution for the electrode distance on the scalp assuming a spherical head model, and this is implemented in the function elec_distance.m, which you referred to. Asking "does <span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#500050">elec_distance.m</span> work properly?" is something you can probably quickly answer yourself :) Do you have reason to think this function is not working properly? Is this not the solution you were hoping for? The more specific and clear your question, the more help can be provided by the community.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">Tim<u></u><u></u></p></div></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p><div><p class="MsoNormal">On Mon, Dec 17, 2012 at 4:51 PM, Iman M.Rezazadeh <<a href="mailto:irezazadeh@ucdavis.edu" target="_blank">irezazadeh@ucdavis.edu</a>> wrote:<u></u><u></u></p>
<div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Tim, I have searched the forum and if you look at my email you can see that I mentioned the function name as well. Also what Steve pointed at is sth different ! </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Anyhow, thanks for the reminder for reading the archives and internet search </span><span style="font-size:11.0pt;font-family:Wingdings;color:#1f497d">J</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> and I would add reading more carefully the emails </span><span style="font-size:11.0pt;font-family:Wingdings;color:#1f497d">J</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Iman</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Tim Mullen [mailto:<a href="mailto:mullen.tim@gmail.com" target="_blank">mullen.tim@gmail.com</a>] <br>
<b>Sent:</b> Monday, December 17, 2012 4:18 PM<br><b>To:</b> Makoto Miyakoshi<br><b>Cc:</b> Iman M.Rezazadeh; UCSD EEG List<br><b>Subject:</b> Re: Inter-Electrode Distance</span><u></u><u></u></p><div><div><p class="MsoNormal">
<u></u><u></u></p><p class="MsoNormal">Iman, a general rule of forums and mailing lists (such as EEGLAB) is to first search the forum/list archives for a solution. In this case, the question has been addressed at least once before: i.e. search for 'inter-electrode distance' in the subject lines for 2010 -- <a href="http://sccn.ucsd.edu/pipermail/eeglablist/2010/subject.html" target="_blank">http://sccn.ucsd.edu/pipermail/eeglablist/2010/subject.html</a>. If you can't find a solution in the archives (or after a little internet searching), then by all means post to the list :)<u></u><u></u></p>
<div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Also, I just saw that Steve noted this topic came up a few days ago on the list...<u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p>
</div><div><p class="MsoNormal">Tim<u></u><u></u></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"> <u></u><u></u></p><div><p class="MsoNormal">On Mon, Dec 17, 2012 at 3:54 PM, Makoto Miyakoshi <<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.edu</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Dear Iman,<u></u><u></u></p><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Why don't you try it first since the function is already there :-)<u></u><u></u></p></div><div>
<p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Makoto<u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p><div><p class="MsoNormal">2012/12/17 Iman M.Rezazadeh <<a href="mailto:irezazadeh@ucdavis.edu" target="_blank">irezazadeh@ucdavis.edu</a>><u></u><u></u></p>
<div><div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt"><p class="MsoNormal"> <u></u><u></u></p><div><div>
<p class="MsoNormal">Hi,<u></u><u></u></p><p class="MsoNormal">Could you please let me know how can I measure the inter-electrode distance on the head surface? Does elec_distance.m woeks properly? <u></u><u></u></p><p class="MsoNormal">
<u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Iman M.Rezazadeh, PhD</span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Postdoctoral Research Fellow</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Center for Mind and Brain</span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">University of California, Davis</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><a href="mailto:irezazadeh@ucdavis.edu" target="_blank">irezazadeh@ucdavis.edu</a></span><u></u><u></u></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Cell:<a href="tel:310-490-1808" target="_blank">310-490-1808</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Skype: Imanmr</span><u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p></div></div></blockquote></div></div></div><p class="MsoNormal">
<span style="color:#888888"><br><br clear="all"></span><u></u><u></u></p><div><p class="MsoNormal"> <u></u><u></u></p></div><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#888888">-- <br>Makoto Miyakoshi<br>
JSPS Postdoctral Fellow for Research Abroad<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego</span><span class="HOEnZb"><font color="#888888"><u></u><u></u></font></span></p>
</div></div><span class="HOEnZb"><font color="#888888"><p class="MsoNormal"><br><br clear="all"><u></u><u></u></p><div><p class="MsoNormal"> <u></u><u></u></p></div><p class="MsoNormal">-- <br>--------- αντίληψη -----------<u></u><u></u></p>
</font></span></div></div></div></div></div></div><span class="HOEnZb"><font color="#888888"><p class="MsoNormal"><br><br clear="all"><u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><p class="MsoNormal">
-- <br>--------- αντίληψη -----------<u></u><u></u></p></font></span></div></div></div></div><br>_______________________________________________<br>
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