[Eeglablist] Channel location EEGLAB

Tue Oct 11 09:11:17 PDT 2022

Hi,

Thanks Malte for clarifying.

On the reference note, it is not recommended to do average-reference with montages with less than 64 electrodes (even <128 according to Nunez and Srinivasan, 2006).
I believe the REST average to infinity is validated for 32 electrode and there is an EEGLAB plugin available through the plugin manager to install it (it only works in GUI mode though, no command line available if that hasn't changed, so no ideal if you have a large dataset and want to batch-process).

Cedric Cannard

------- Original Message -------
On Monday, October 10th, 2022 at 10:37 PM, Malte Anders <malteanders at gmail.com> wrote:

> 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*
>>>>>>> _______________________________________________
>>>>>>> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
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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](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$ )
>>>
>>> --
>>>
>>> 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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