[Eeglablist] relocating electrodes

[Makoto Miyakoshi]

Dear Pancy,

I am against the idea of using asymmetric electrode montage. This is
because the hemispheric difference you expect to observe is better shown as
a confirmation rather than an assumption.
Even if you have a couple of electrodes on one hemisphere than the other,
that does not increase the spatial resolution very much.
ICA is good at handling dataset with relatively low number of electrodes.
If you have seriously many channels (> 128), you might want to use spline
Laplacian in which spatial resolution linearly increases as the number of
scalp electrodes increases.

Note also that TP9 and FT9 tend to be contaminated by muscle potential
artifacts.

I recommend you stick to standard 32 ch montage from international 10-10
system. If you want to increase spatial resolution, try to record very
clean data and apply ICA. This is more promising and feasible way to obtain
good spatial resolution.

Makoto

On Tue, Jul 18, 2023 at 12:36 PM Pancy Pang via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear EEGLAB list members,
>
>
>
> I am thinking whether I can put some of the EEG electrodes on the right
> hemisphere to the left hemisphere. I am recording with 32 channels, and my
> study is about activities on the left hemisphere. I want to increase the
> number of electrodes in the region that I am interested, so I am thinking
> whether I get TP10 and FT10 to put at FC3 and F5. I can modify the channel
> location file for doing analyses with EEGLAB.
>
>
>
> My question is: If I do so, then there will be more electrodes on one side
> of the scalp. Would it create some problems? Or, even if I want to relocate
> some electrodes, I should only use those on the same hemisphere, such as
> TP9, FT9?
>
>
>
> Best regards,
>
> Pancy
>
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