[Eeglablist] Channel Locations for BioSemi- Off centre problem

[Makoto Miyakoshi]

Dear Liat,

I often noticed it too, but every time I saw it I suspected this should be
an optical illusion due to the labels plotted off the center... sorry if
I'm not getting what you mean.

Makoto


On Thu, Aug 21, 2014 at 2:29 AM, Liat <l.levita at sheffield.ac.uk> wrote:

> Hello dear all,
>
> I have seen a few posts about issues importing Biosemi Channel coordinates
> to EEGLab. Following another post, I have made some progress in doing this
> (created a .txt file to upload locations, which I hope is correct)
>
> Method used:
>
> *1.* Typed following command
>
> * pop_chanedit(readlocs('biosemi_eloc.txt', 'format', { 'labels'
> 'sph_theta_besa' 'sph_phi_besa' }, 'skiplines', 1))*
>
> *'biosemi_eloc.txt’ – File containing biosemi coordinates
> and electrode locations names - at end of message pasted in what is in
> that text file.*
>
> *2.* A pop_chanedit() GUI will come up – press *Okay*
>
> *3. * A pop_chanedit() GUI will come up – which now contain the Biosemi
> coordinate space (as specified in the text file). Now you can save this
> information as a  .ced file (also attached), which I can be used to edit
> the location channels more easily in the future.
> However,  but when I plot (2D) I can see some channel locations off the
> model head, most look okay, but some seem to be to be positioned to much to
> left (out of the head), even though CZ does seem to be in the middle. How
> does one fix this? and is this a real problem? The 3D looks okay.
>
> Thank you for your help in advance,
>
> Liat
>
> PS.
>
> *biosemi_eloc.txt’*
> Electrode _ _
> Fp1 -92 -72
> AF7 -92 -54
> AF3 -74 -65
> F1 -50 -68
> F3 -60 -51
> F5 -75 -41
> F7 -92 -36
> FT7 -92 -18
> FC5 -72 -21
> FC3 -50 -28
> FC1 -32 -45
> C1 -23 0
> C3 -46 0
> C5 -69 0
> T7 -92 0
> TP7 -92 18
> CP5 -72 21
> CP3 -50 28
> CP1 -32 45
> P1 -50 68
> P3 -60 51
> P5 -75 41
> P7 -92 36
> P9 -115 36
> PO7 -92 54
> PO3 -74 65
> O1 -92 72
> Iz (inion) 115 -90
> Oz 92 -90
> POz 69 -90
> Pz 46 -90
> CPz 23 -90
> Fpz 92 90
> Fp2 92 72
> AF8 92 54
> AF4 74 65
> Afz 69 90
> Fz 46 90
> F2 50 68
> F4 60 51
> F6 75 41
> F8 92 36
> FT8 92 18
> FC6 72 21
> FC4 50 28
> FC2 32 45
> FCz 23 90
> Cz 0 0
> C2 23 0
> C4 46 0
> C6 69 0
> T8 92 0
> TP8 92 -18
> CP6 72 -21
> CP4 50 -28
> CP2 32 -45
> P2 50 -68
> P4 60 -51
> P6 75 -41
> P8 92 -36
> P10 115 36
> PO8 92 -54
> PO4 74 -65
> O2 92 -72
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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