[Eeglablist] how do deal with ECOG and other channels not in .elp file?

[arno]

Dear Jim,
> Hi, when the number of channels in our .bdf file does not match the 
> number in our .elp file, EEGLAB will not accept the channel locations. 
> We record 8 extra channels for ecog, etc., as well as GSR data, and 
> want to do analysis including these channels. Is the solution to 
> create additional entries in the .elp file?
This is not necessary (see below).
> We can digitize the electrodes for ecog etc. on the face (is this 
> recommended?), but not the GSR electrodes. Is it OK if we just use 
> "made up" coordinates so something will appear in the .elp file?
It is better to import the ELP file then insert ("Insert" pushbutton) 
electrodes and just enter the label (no location information). EEGLAB 
will detect that these electrodes have no location, and will process 
them accordingly (basically it will not crash when you try plotting them 
;-).
> Or would it be better to add these additional channels somehow after 
> the scalp electrodes are already loaded by EEGLAB?
Yes (see above).

Arno