<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><br>Hi Robert, </div><div>Thank you for your help. Indeed, the location on the sphere looks good after adjusting these parameters. </div><div>Thank you a lot.</div><div>Best regards, </div><div>Anna</div><div><br></div><div><br>Sent from my iPad</div><div><br>On 12 May 2015, at 11:05, Robert Oostenveld <<a href="mailto:r.oostenveld@donders.ru.nl">r.oostenveld@donders.ru.nl</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html charset=windows-1252">Hi Ana<div><br></div><div>The ft_prepare_layout function reads the electrode positions and scales them such that they fit in the sphere that represents the head.</div><div><br></div><div>I suggest you do </div><div><br></div><div>cfg.layout = ‘yourfilename’</div><div>lay = ft_prepare_layout(cfg);</div><div><br></div><div>cfg = [];</div><div>cfg.layout = lay;</div><div>ft_layoutplot(cfg);</div><div><br></div><div>and then modify lay.pos repeatedly, every time plotting it again, until you are happy with the result. You probably want to do this for the vertical direction </div><div>lay.pos(:,2) = (lay.pos(:,2)+shift) .* scale;</div><div>to shift and scale the electrodes to a better fit inside/outside the sphere, and this for the horizontal</div><div><div>lay.pos(:,1) = lay.pos(:,1) .* scale;</div></div><div>as they seem to be properly centred along the x-axis alreadly.</div><div><br></div><div>After this, you can </div><div>save yourlayout.mat lay</div><div>and specify “yourlayout.mat” as the layout filename for your future figures.</div><div><br></div><div><br></div><div>best regards</div><div>Robert</div><div><br></div><div><br></div><div><br><div><div>On 12 May 2015, at 10:17, Anna Wieczorek-Taraday <<a href="mailto:anna.wieczorek.taraday@gmail.com">anna.wieczorek.taraday@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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Dear Fieldtrippers, <br>
<br>
I have a problem while reading EEG (EGI) electrode location file to FieldTrip.<br>
I am using EGI Amp 300, 64-channel cap, data were exported to .raw files.<br>
<br>
When I read locations to EEGLAB, it works well (<a href="https://www.dropbox.com/sh/aq4purahda5iq1x/AAABpAqJJTYAXcMgW4FsBDzWa?dl=0" target="_blank">lilnk to pictures</a> || see pic. eeglab_chanlocs.jpg). The layout corresponds with the actual electrode placement
in the cap.<br>
When I read the same file into FieldTrip, the electrodes seem to have similar layout (see pic. fieldtrip_chanlocs.jpg).
<br>
However, it seems like the electrodes are confined within the plot too much. Electrodes E61:E64 should be outside of boundaries of the layout plot.<br>
<br>
I was wondering whether anybody else had similar issue and did overcome it? Could anybody suggest what is wrong and how can I read the locations properly?<br>
Any support will be appreciated.<br>
<br>
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<div class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(102,102,102)">
I am using Matlab 2015, eeglab eeglab13_4_4b and the latest version of fieldtrip.<br>
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<br>
Here is code I used to read these locations:<br>
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cfg.layout = 'C:\Users\annwie\Documents\awt_chanlocs\GSN-HydroCel_64.sfp'; <br>
cfg.feedback = 'yes';<br>
layout = ft_prepare_layout(cfg);<br>
<br>
<br>
Here is the code that I used to preprocess my data in Fieldtrip:<br>
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cfg = [];<br>
cfg.trialfun = 'ft_trialfun_general';<br>
cfg.dataset = '136.set';<br>
cfg.trialdef.eventtype = 'trigger';<br>
cfg.trialdef.eventvalue = 'DIN8'<br>
cfg.trialdef.prestim = 0.5;<br>
cfg.trialdef.poststim = 2.5;<br>
cfg = ft_definetrial(cfg);<br>
<br>
cfg.lpfilter = 'no';<br>
cfg.hpfilter = 'yes';<br>
cfg.hpfreq = 0.3;<br>
data = ft_preprocessing(cfg);<br>
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<div><span style="font-size:small;color:rgb(136,136,136)">Anna Wieczorek-Taraday.</span></div>
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<div><font face="tahoma, sans-serif"><span style="color:rgb(136,136,136)"><font size="1">PhD Student </font></span><br>
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<div><span><font size="1" face="tahoma, sans-serif"><span style="color:rgb(80,0,80)"><span style="color:rgb(136,136,136)">Nencki Institute of Experimental Biology</span><br style="color:rgb(136,136,136)">
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<span style="color:rgb(68,68,68)"><span style="color:rgb(136,136,136)"><font size="1" face="tahoma, sans-serif">Warsaw University of Social Sciences and Humanities<br>
Chodakowska Street 19/31, 03-815 Warsaw, Poland</font></span></span><br>
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