problems with 32 electrodes layout

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Posts: 4
Joined: Sun Oct 10, 2010 11:58 pm
Location: montreal

problems with 32 electrodes layout

Post by dietcoke » Sat Jan 08, 2011 6:43 pm

Hi all,

we have purchased a 32 A layout but realized that biosemi seems to take this 32 A layout from the 64 A+B layout. Thus, the recordings do not correspond to the actual electrode locations. As if the A layout has been directly taken from the A+B layout (we only have the A(oddsumbers) electrodes).

Moreover, some electrodes non-existant in the A layout (i.e., but do exist in the 64 layout) appear in the monopolar display, whikle others are absent. How can we set Biosemi to match with the 32 A layout only?

We also tried to manually select the electrodes (A1 to A32) using the freechoice, but the electrodes still dont match (ex. A4 = F1 in Biosemi, like in the 64 electrodes configuration. In our configuration, A4 should be F3).

I dont know if this could help you, but we re using a chidren cap...

any ideas how to solve this?

thanks a lot!


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Post by Coen » Sun Jan 09, 2011 1:22 pm

Compare the layouts on

If you want to do both 32 and 64 chan measurements, you should either relabel your caps and electrodes to ABC labeling, or you should purchase an extra dedicated A set for the the 32-chan measurements.

A 32-channel CFG is provided on the software CD and in the ActiView downloads on

Best regards, Coen (BioSemi)

Posts: 4
Joined: Sun Oct 10, 2010 11:58 pm
Location: montreal

Post by dietcoke » Mon Jan 10, 2011 7:04 pm


thanks a lot for your answer.

3 things:

-our team (but other team are using the same lab indeed) only wants to records with 32 electrodes

-we don t know how to relabel our caps annd electrodes. We must change manually the stickers or...?

-we dont want to buy another cap...unless its absolutely necessary!



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