Which electrode to reference when importing data into EEGLAB
Hi,
I am not clear on which electrode to reference when importing data into EEGLAB. On the EEGLAB Pre-processing Tools webpage I read:
Systems with active electrodes (e.g. BIOSEMI Active Two), may record
data reference-free. In this case, a reference be must be chosen post hoc during data import. Failing to do so will leave 40 dB of unnecessary noise in the data!
I don't want to lose the signal quality. I believe OpenBCI uses Active Electrodes, but do not know which to choose during an import? Which one is best suited? All of the other electrode signals will reference the one. I don't understand how this does not skew results?
Thanks,
Don
I am not clear on which electrode to reference when importing data into EEGLAB. On the EEGLAB Pre-processing Tools webpage I read:
Systems with active electrodes (e.g. BIOSEMI Active Two), may record
data reference-free. In this case, a reference be must be chosen post hoc during data import. Failing to do so will leave 40 dB of unnecessary noise in the data!
I don't want to lose the signal quality. I believe OpenBCI uses Active Electrodes, but do not know which to choose during an import? Which one is best suited? All of the other electrode signals will reference the one. I don't understand how this does not skew results?
Thanks,
Don
Comments
Another question - could I pick up a Ganglion, hook it up in parallel using electrodes to cover Fpz, Cz, Oz, and Fp1? I would wire Fp1 in parallel between the Cyton and Ganglion (giving the two a common reference)?
Or would that electrically skew the reading of Fp1? If so, could I use a Zener diode (concept - use whatever mechanism necessary) to electrically isolate one board from another?
The output signals could then be married together, thus increasing the signal quality by introducing a 'common' electrode.
Thanks,
Don