[FieldTrip] Independent component analysis (ICA) to remove EOG artifacts

[Elif Tülay]

Hi Erfan,

Maybe I can suggest a way to try until a technical answer comes from Jan.
If you are familiar with your data, you can detect the bad channel by
visual inspection using ft_databrowse. After that, while you are running
ICA, you can exclude the bad channel with the following format (you can
modify it according to your data)



*     cfg.channel = {'all','-Cz'} %just an example for excluding Cz
from all channels*

I hope it works for you

Best


On Sun, May 7, 2023 at 12:41 PM Erfan Vi via fieldtrip <
fieldtrip at science.ru.nl> wrote:

> Hi Jan,
>
> Thank you for your clear response. How can I determine the name of this
> bad channel which is recognizable in the forwarded image? I am new to
> FildTrip sorry for the basic questions.
>
> Erfan-Vajdi
>
> On Thu, May 4, 2023 at 11:01 AM Schoffelen, J.M. (Jan Mathijs) via
> fieldtrip <fieldtrip at science.ru.nl> wrote:
>
>> Hi Erfan,
>>
>> These results look like a classical example of a bad channel. If you
>> remove this channel from the data prior to running the IC decomposition,
>> results should look more sensible.
>>
>> Good luck,
>> Jan-Mathijs
>>
>>
>> On 29 Apr 2023, at 11:04, Erfan Vi via fieldtrip <fieldtrip at science.ru.nl>
>> wrote:
>>
>> Dear FieldTrip users,
>> I have used an example script in the
>> FieldTrip site to remove EOG artifacts for MEG data example located at
>> https://urldefense.com/v3/__https://www.fieldtriptoolbox.org/example/ica_eog/__;!!HJOPV4FYYWzcc1jazlU!78wfaL8guG-ERDfcMtJlfsMlm-2kAF65V4Nw6DWLMrhVqorpaATt5nUut9_x0qKtt2ofhlfC7OxWkMU2NYLDnjiqSg$ 
>> <https://urldefense.com/v3/__https://www.fieldtriptoolbox.org/example/ica_eog/__;!!HJOPV4FYYWzcc1jazlU!8RVcT7vt9rwPHgbzvPH5IFv1KhvliFf9uclvd7fGeD9y3jTEiNhEtGq3rVOa03BcW9lZ3qoBc324h57I8PtCyKZbyA$>
>> using ICA. But I got poor results as below image. Any one can help me?
>> Thank you,
>>
>> <ICA.jpg>
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