[Eeglablist] Channel location EEGLAB

[Malte Anders]

EOG positions can be added using the 10-20 names LO1, LO2, SO1 and IO1 and
the button "look up locs". You can have a look at the eeglab tutorial where
it is explained how that is done.

However, as Cedric already noted: artifact rejection has come a long way. I
would never fiddle with four additional channels just for the purpose of
rejecting some eye blinks. With the appropriate parameters, ASR will do
that just fine without EOG channels. There are some cases where EOG might
have it'd benefits, but I personally haven't seen any. Especially if you're
a beginner, I would specifically argue against recording EOG and put more
effort in doing everything else right (such as electrode impedances,
electrode positioning, grounding and such). If you add the scalp channels
FP1, FP2 and FPZ to your dataset, you will be fine as far as eye blinks are
concerned. Also, as you "only" have 19 recording channels, I would rather
add more channels to the scalp in the future, for example up to at least 32
recording channels. In that case, average reference becomes a viable thing.


Best,
Malte


Cedric Cannard via eeglablist <eeglablist at sccn.ucsd.edu> schrieb am Di.,
11. Okt. 2022, 06:34:

> No, most people don’t even include them. ASR and ICA should detect and
> reject ocular components well without them.
>
> Cedric
>
> On Mon, Oct 10, 2022 at 09:49, Chiara Ciacchella <
> chiara.ciacchella at uniroma1.it> wrote:
>
> > I think I need them for artifact detention. Am I wrong?
> >
> > Chiara
> >
> > Il giorno lun 10 ott 2022 alle 18:21 Cedric Cannard <
> ccannard at protonmail.com> ha scritto:
> >
> >> You’re welcome.
> >> Mmh I do not think there are coordinates for auxiliary channels. Maybe
> someone can correct me if I’m wrong. Why do you need them?
> >>
> >> Cedric
> >>
> >> On Mon, Oct 10, 2022 at 03:07, Chiara Ciacchella <
> chiara.ciacchella at uniroma1.it> wrote:
> >>
> >>> Dear Cedric,
> >>> Thank you very much for your reply. Can I ask you how to set the
> channel position for EOG? Because by following the steps, the fields for
> the EOG channel positions remain empty.
> >>>
> >>> Il giorno dom 9 ott 2022 alle ore 17:33 Cedric Cannard <
> ccannard at protonmail.com> ha scritto:
> >>>
> >>>> Dear Chiara,
> >>>>
> >>>> That’s normal, I believe EEG files never contain channel locations
> inside them (in my experience). After you imported your data in eeglab, and
> go to Tools > Channel locations > Ok > Ok and the default BEM locations
> will be imported.
> >>>> You can select another montage from the dipfit plugin folder if
> that’s not the correct ones for your system.
> >>>>
> >>>> Cedric
> >>>>
> >>>> On Sun, Oct 9, 2022 at 06:39, Chiara Ciacchella via eeglablist <
> eeglablist at sccn.ucsd.edu> wrote:
> >>>>
> >>>>> Hello,
> >>>>> I am new to EEG signal processing with EEGLAB. I tried to find the
> answer
> >>>>> but I was not successful. I kindly ask for your help in this.
> >>>>> I recorded EEG with GEASOLUZIONI software and the data file contains
> only
> >>>>> channel labels, but I don't have a file with channel location
> information.
> >>>>> How can I manually add the channel location information?
> >>>>>
> >>>>> I know that the cap refers to 10-20 system and it contains the
> following
> >>>>> electrodes:
> >>>>> Active electrode: Fp1, Fp2, F7, F3, F4, Fz, F8, T3, C3, Cz, C4, T4,
> T5, P3,
> >>>>> Pz, P4, T6, O1, O2
> >>>>> Referential and neutral: A1, A2, N
> >>>>> Additional electrode for artifact detention: EOG, ECG, EMG, 1 slot
> for RR
> >>>>> sensor
> >>>>>
> >>>>> Thanks in advance,
> >>>>> Chiara
> >>>>>
> >>>>> --
> >>>>> *Chiara Ciacchella, Ph.D. student*
> >>>>> *Department of Dynamic and Clinical Psychology, and Health Studies*
> >>>>>
> >>>>> *"Sapienza" - University of RomeVia degli Apuli, 100185 Rome, Italy*
> >>>>> _______________________________________________
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> >>> --
> >>>
> >>> Chiara Ciacchella, Ph.D. student
> >>> Department of Dynamic and Clinical Psychology, and Health Studies
> >>> "Sapienza" - University of Rome
> >>> [Via degli Apuli, 1](
> https://urldefense.com/v3/__https://www.google.com/maps/search/Via*degli*Apuli,*1*00185*Rome,*Italy?entry=gmail&source=g__;KysrKysr!!Mih3wA!HNQ1xFeGVJCiCLeCGCOzlAAYMGpAQwLT7k9pHfsoIS1zOWifaoZKJWcwE1QtDXGoDy9cvzTrV-7oIgS20zA3DS4-Iw$
> )
> >>> [00185 Rome, Italy](
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> >
> > --
> >
> > Chiara Ciacchella, Ph.D. student
> > Department of Dynamic and Clinical Psychology, and Health Studies
> > "Sapienza" - University of Rome
> > Via degli Apuli, 1
> > 00185 Rome, Italy
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