[Eeglablist] Eye Movement Artifact correction

[Makoto Miyakoshi]

Dear Agnieszka,

I'd still recommend you use ICA for ocular artifact rejection. Note that
you use all channels (expect for one channel for reference) for ICA, which
means you should have 8 ICs in the end.

Makoto


On Fri, Jan 22, 2016 at 1:57 AM, Agnieszka Zuberer <azuberer at googlemail.com>
wrote:

> Dear eeglab-users,
>
> we currently do measurements with 4 eye-, 2 mastoids- and 3 scalp
> electrodes (FZ,CZ,OZ) struggling with finding a suitable eye movement
> artifact correction procedure.
>
>    - *ICA *can only create components equal to one less than the total
>    number of electrodes that one has recordings from, so this procedure
>    probably will not be suitable.
>    - We tried a *regression based correction* (gratton et al, 1985) but
>    it was over-correcting the artifact, sometimes even flipping polarities of
>    eye blinks amplitudes.
>    - one can remove some noise with a low-pass filter, but that won't get
>    rid of eye artifacts.
>    - High-pass filters can distort potentials generated by eye blinks, so
>    that it will become difficult to find them with *thresholding
>    procedures*.
>
> Advice for a proper solution for this problem would be highly appreciated.
>
> Would a kurtosis based artifact correction (as implemented in eeglab) be
> suitable in our special case or does the eeglab-plugin for kurtosis based
> artifact rejection depend on a certain number of electrodes?
>
> Thank you in advance for your response.
> Agnieszka Zuberer
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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