[Eeglablist] Channel Locations for BioSemi

[Arnaud Delorme]

Dear Vincent,

you have to use the alternate theta and phi spherical coordinates. Try

pop_chanedit(readlocs('biosemi_eloc.txt', 'format', { 'labels' 'sph_theta_besa' 'sph_phi_besa' }, 'skiplines', 1));

with the attached text file I extracted from the Excel file you sent.
Best,

Arno



On 13 Aug 2013, at 11:57, Makoto Miyakoshi wrote:

> Dear Vincent,
> 
> You mean EEGLAB default channel location files for biosemi should have 10-5? I'll discuss it with Arno. Thank you for your feedback.
> 
> 10-5 is extended version of 10-20 (Oostenveld and Praamstra, 2001).
> 
> Makoto
> 
> 
> 2013/8/13 Vincent LeBlanc <leblvin at gmail.com>
> Hi Makoto,
> 
> You can set those channel names in your biosemi config file. That saves a lot of time. 
> As for me, I'm using 10-20 so I'm not sure of how that translates to 10-5.
> Good luck =)
> 
> 
> 2013/8/12 Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> Dear Vincent,
> 
> > If I set the labels to FP1, FP3 etc. instead of A1, A2, etc., I do get coordinates.
> 
> Yes, this is what I experienced too. I guess 'pair channels' does not work if you have non 10-5 channel names.
> 
> So my personal solution for this kind of dataset is that you chose 5 closet channels (Fz -> ??, Cz -> ??, Pz->??, T7->??, T8->??) and rename them into 10-5 names. Then warp montage using these renamed channels. This is an ugly solution but it still works and better than nothing.
> 
> Makoto
> 
> 2013/8/6 Vincent LeBlanc <leblvin at gmail.com>
> Hi Enzo!
> If I keep the original labels, it can't find any coordinates. If I set the labels to FP1, FP3 etc. instead of A1, A2, etc., I do get coordinates. However, when I plot their location, some of the channels are off the head. Is that simply an effect of not having a 3D map of their localisation? 
> 
> 
> 2013/8/5 Enzo Brunetti <enzo.brunetti at gmail.com>
> Hi Vincent,
> 
> eeglab's plugin 'dipfit' offers some head montages including some Biosemi common layouts. When you use Edit/Channel locations, the displayed window offers you to look up the corresponding coordinates for the labels present in the .bdf file. Try clicking 'Ok' in this window to see if it helps you.
> 
> Good luck.
> 
> 
> El 05-08-2013, a las 13:51, Vincent LeBlanc <leblvin at gmail.com> escribió:
> 
>> Hi to all!
>> 
>> I've been trying to correctly enter the BioSemi coordinates into eeglab, to no avail. Using the excel sheet on their website (http://www.biosemi.com/download/Cap_coords_all.xls) gives me absurd results when plotting the channel positions.
>> I'm using the 64 electrodes cap. Does anybody have a clue on where/how I could get those coordinates?
>> 
>> Thanks in advance =)
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> 
> 
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> 
> -- 
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
> 
> 
> 
> 
> -- 
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
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