[Eeglablist] Re [eeglablist] online EOG removal (Michael Simon)

[Alois Schlögl]

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> 
> Message: 1
> Date: Fri, 25 Sep 2009 09:07:35 +0200
> From: Michael Simon <micha.m.simon at googlemail.com>
> Subject: [Eeglablist] online EOG removal
> To: eeglablist at sccn.ucsd.edu
> Message-ID:
> 	<601d559c0909250007h6bf0f152s75660c8b1ad5a834 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hello eeglablist,
> 
> we are currently working on a monitoring system, that extracts features from
> the EEG in real time. Unfortunately ocular artifacts contaminate these
> features. So it would be desirable to eliminate these artifacts in real
> time. We are recording EOG channels (vertical and horizontal).
> Does anybody know methods that perform EOG removal in real time? It would be
> best if no baseline recording is required and the removal would be in an
> automated manner.
> 
> Regards
> 
> Michael



Hello Michael,


we have validated a fully automated method [1]. The method can be easily
applied for real-time EOG "removal". The results shows that only up to
80% of EOG artifacts are removed, so it is more a reduction method than
a removal method. However, it is reasonable to assume that no other
automated method is doing better [2].

Baseline recordings are useful to get most accurate estimates for the
correction coefficients, without baseline the correction is most likely
worse.


Best,
   Alois



[1] A. Schlögl, C. Keinrath, D. Zimmermann, R. Scherer, R. Leeb, G.
Pfurtscheller. A fully automated correction method of EOG artifacts in
EEG recordings. Clin.Neurophys. 2007 Jan;118(1):98-104. Epub 2006 Nov 7

[2] A. Schlögl, A. Ziehe, K.-R. Müller (2009)
Automated ocular artifact removal: comparing regression and
component-based methods.
Preprint available at http://precedings.nature.com/documents/3446/version/1


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