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Question about coordinates
Posted: Wed Dec 25, 2013 12:06 pm
by Boris
Hello
I would like to ask several questions about coordinates:
(1) What are the units of coordinates in file provided by Biosemi?
(2) Why in Biosemi file r is taken as 100?
(3) How can I convert these coordinates to sLoreta an EEGLAB? Is origin of Biosemi provided coordinates the same as for sLoreta and EEGLAB?
Thanks
Boris
Re: Question about coordinates
Posted: Mon Jan 06, 2014 1:44 pm
by Coen
(1) What are the units of coordinates in file provided by Biosemi?
Choose any length unit you want, and then scale appropriately by selecting the proper value for the head radius (r)
(2) Why in Biosemi file r is taken as 100
Just to list easy-to-read numbers, choose your own head radius (r) depending on length unit and head head circumference (cap size).
(3) Is origin of Biosemi provided coordinates the same as for sLoreta and EEGLAB?
The origin location is fully explained in the file on
http://www.biosemi.com/download/Cap_coords_all.xls
Best regards, Coen (BioSemi)
Re: Question about coordinates
Posted: Sun Sep 25, 2016 5:12 pm
by iza
Coen wrote:
> The origin location is fully explained in the file on
>
http://www.biosemi.com/download/Cap_coords_all.xls
Hi,
Is it possible to find somewhere electrode coordinates for the system with 192 electrodes?
I see that there are no avaialbe in the file mentioned above
Best,
Re: Question about coordinates
Posted: Mon Sep 26, 2016 11:41 am
by Coen
192 is a custom made special, probably a standard 160 plus 32 extra positions, no position file is available from BioSemi.
The 32 extra coordinates are quite easily calculated by yourself by extrapolation.
Best regards, Coen (BioSemi)