<div dir="ltr">Dear Ramon,<div><br></div><div>He says EasyCap file is not compatible with EEGLAB channel import. Could you check it?</div><div><br></div><div>Meanwhile, Ai, if you have channels names like Fz, Cz, Pz... this naming rule is called 'international 10-5 system' which EEGLAB can find their default values according to Oostenveld and Praamstra (2001)'s definition. Just confirm that all the channel names follow this 10-5 system, and import it, and 'find locs' in 'edit-channel locations'.</div><div><br></div><div>Makoto<br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 13, 2014 at 3:39 AM, AI KOUITSU <span dir="ltr"><<a href="mailto:ai-kouitsu@edu.brain.kyutech.ac.jp" target="_blank">ai-kouitsu@edu.brain.kyutech.ac.jp</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello all,<br>
<br>
I am a beginner, and I have some questions about how to calculate<br>
the electrode locations for Easycap and the topoplot() function.<br>
<br>
1. As is written in this page <a href="http://sccn.ucsd.edu/wiki/Channel_Location_Files" target="_blank">http://sccn.ucsd.edu/wiki/Channel_Location_Files</a>,<br>
the Easycap electrode location file seems compatible with eeglab-->readlocs()<br>
function. But the hyperlink has been invalidated.<br>
<br>
2. I downloaded the Easycap electrode location file from the availableofficial webpage,<br>
<br>
<a href="http://www.easycap.de/easycap/e/downloads/electrode_sites_coordinates.htm#2" target="_blank">http://www.easycap.de/easycap/e/downloads/electrode_sites_coordinates.htm#2</a>,<br>
<br>
and tried to import it by "Edit-->channel locations-->Read locations". When I pressed<br>
the "Read locations" and selected the location file, a pop-up list starting by<br>
"File format: autodetect...." appeared. But after I pressed the "OK" button,<br>
an error came out with the following messages.<br>
<br>
Undefined function or variable "eloc".<br>
<br>
Error in readlocs (line 458)<br>
if isfield(eloc, 'sph_theta_besa')<br>
<br>
Error in pop_chanedit (line 664)<br>
[chans] = readlocs(tmpargs{:});<br>
<br>
Error using waitfor<br>
Error while evaluating uicontrol Callback<br>
<br>
3. I also tried to input the XYZ-coordinates manually, but the electrode locations<br>
are a little strange that they are not on a unit spherical surface, it's like an<br>
ellipsoid surface. I am really confused, because I saw all the coordinates from your<br>
standard .loc file have the same radius (on a unit sphere).<br>
What should I do when construct a 2D heap map from such kind of 3D coordinates?<br>
<br>
4. I am also wondering what algorithm you applied when topoplot. Something about<br>
Current Source Density and Surface Laplacian can be found over the internet,<br>
but write such codes seems not so easy, could you give me some hints or advice<br>
of how draw a 2D head map?<br>
<br>
Thank you!<br>
<br>
Best regards,<br>
<br>
Guangyi Ai<br>
=======================================================<br>
KYUSHU INSTITUTE OF TECHNOLOGY<br>
Graduate School of Life Science and Systems Engineering<br>
Dept. of Brain Science and Engineering<br>
Guangyi Ai<br>
<br>
Email: <a href="mailto:ai-kouitsu@edu.brain.kyutech.ac.jp">ai-kouitsu@edu.brain.kyutech.ac.jp</a><br>
=======================================================<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div>
</div></div></div>