[Eeglablist] Question regarding reference channel (Makoto's Preprocessing Pipeline)

[Clement Lee]

Hi Mahjabeen,

It's 64 for built-in EEGLAB processing and 65 for full rank average
referencing. GND is always 0 (even if you rereference), but REF is only 0
when you are actually referenced to it (and becomes non-zero if you
rereference to any other montage).

Best,
Clement Lee
Applications Programmer
Swartz Center for Computational Neuroscience
Institute for Neural Computation, UC San Diego
858-822-7535


On Thu, Mar 12, 2020 at 12:32 AM Mahjabeen Rahman <
mahjabeen.rahman at knights.ucf.edu> wrote:

> Hi everyone,
>
> I am confused about one issue regarding my reference channel. I am
> recording data with Cognionics Mobile 64 channel device. So there are two
> zero-filled channels on the cap I am using called "REF" and "GND" near the
> mastoid region which never show up during the recording. When I import the
> raw data to eeglab, it shows no reference channel, only 64 channels show
> up. I am not sure, how I will apply average referencing here. Should I have
> to worry about the denominator here? Should it be 64 or 66 (considering the
> two zero-filled channels).
>
> Would appreciate any help on this.
>
> Thanks,
> Mahjabeen Rahman
> PhD Student
> Industrial Engineering & Management Systems
> University of Central Florida
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