Ηead-Plot 10-20 positioning ?
mhadji05
Cyprus
Hello all,
I have connected the following electrodes in this series (C3, C4, P3, P4, T3, T4, F3, F4).
The electrodes in the Ηead-Plot are displayed in wrong positions according to the 10/20 International system (see attach img).
How can I fix it ?
Thank you in advance!
Comments
Marios, hi.
This is a related thread, found with the "Google Advanced Search" button at upper right column.
https://openbci.com/forum/index.php?p=/discussion/953/modify-gui-headmap-electrode-positions-channels
https://www.google.com/search?as_q=head+plot&as_sitesearch=openbci.com
https://www.google.com/search?as_q=head+map&as_sitesearch=openbci.com
William
I don't understand what do you suggest. Please can you explain me better how can i fix the positions of the channels in the headplot step by step?
Thanks a lot.
Did you read the previous links??
https://openbci.com/forum/index.php?p=/discussion/953/modify-gui-headmap-electrode-positions-channels
You can modify the file mentioned, but will need to determine the coordinates experimentally. A graphing / plotting program that shows coordinates as the cursor is moved, should make that easier.
Just for reference, the GUI head map coloring algorithm, is mainly to give a very rough idea of your channel amplitudes. But is not the same sort of 'calibrated' head map that is drawn by clinical software such as QEEG maps.
https://www.google.com/search?q=qeeg+map
This is likely the ordering of the channels in the coordinate file:
https://openbci.com/forum/index.php?p=/discussion/1087/connecting-mark-iv-to-cyton-including-daisy-board/p1
Given that channel to position mapping, you can just swap around the coordinates lines to achieve your desired order of: "(C3, C4, P3, P4, T3, T4, F3, F4)"
This is a related recent thread, where Richard states that he is working on a new feature for this, by end of summer. However the above 'trick' with the file will work currently.
https://openbci.com/forum/index.php?p=/discussion/2976/how-can-i-set-the-position-of-the-electrodes-for-the-head-map-display#latest