[Eeglablist] Removing EOG artefact using ICA and converting back to EEG channels

[Miklos Argyelan]

Hi Alexandra,

If I understand your problem correctly, the only thing you have to do is to
overwrite with zeros that component which you would like to discard. After
this you can make the inverse transformation.

Miklos

--
Miklos Argyelan MD, MSc

SUNY Downstate Medical Center
450 Clarkson Ave, New York, NY, 11203
tel: +1-718-270-2975

On 3/2/06, Vuckovic, Aleksandra <vuckovic at essex.ac.uk> wrote:
>
> Hello,
>
> I would like to remove eye movement artefacts from EEG signals. I saw
> that ICA is very efficient in it. However I would like to work on EEG
> data not on ICA components. I have 64 channels EEG. So when I perform
> ICA, EOG will be one component which I can discard. However if I now
> want to perform inverse transformation I have a problem: 63 ICA
> components and 64 EEG channels. Does anybody have a suggestion how to
> solve the problem? Would it help adding a dummy component of a constant
> value around 0, and then performing inverse ICA?
>
> Thanks a lot in advance!
>
> Aleksandra Vuckovic
>
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