[Eeglablist] substracting channels

[arno delorme]

If these are the two first channels, you could use the re-referencing  
menu, select you new reference channel (channel 2) and then exclude  
all channels except channel 1 from referencing. However, this is like  
tweaking the program as the re-referencing menu is not really designed  
for that purpose.

Alternatively, you may simply type on the command line

EEG.data(1,:,:) = EEG.data(1,:,:) - EEG.data(2,:,:);

then save it in the EEGLAB backup memory

ALLEEG = eeg_store(ALLEEG, EEG, CURRENTSET);

then you may also save it from the EEGLAB menu.
Hope this helps,

Arno

On 30 avr. 08, at 14:37, Andrea Handl wrote:

> I would like to construct bipolar channels (VEOG and HEOG) from the
> unipolar channels (average reference) I recorded.
> As I suppose I have to do that by substracting channel a from  
> channel b,
> I would like to know how exactly I can
> do that in EEGlab.
>
> Thank you for your suggestions!
>
> Andrea