[Eeglablist] Channel Locations for BioSemi- Off centre problem

[Liat]

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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