[Eeglablist] Removing EOG components with ICA

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Wed May 10 07:57:59 PDT 2017


Dear Paolo,

This is a very belated response but hopefully still helpful to someone.

> but the amplitude of the signal is lower, from tens of muV to 1-2 muV

That's because EOG's variance was removed.
It is not surprising to see more than 90% of vairance is removed after
various artifact removals (typically using IC rejection). In the upcoming
paper submissions I start to report all of this kind of data rejection
statistics.

Makoto



On Fri, Feb 17, 2017 at 10:35 AM, Paolo Da Pelo <paolodapelo at gmail.com>
wrote:

> Dear developers,
>
> I use 64 channels including 2 EOGs. I would like to remove blinks by using
> EOG's informations. So I started an ICA analysis on continuous data and I
> removed the first 2 components which are clearly related to blinks. The
> output is clean and free of blinks artifacts, but the amplitude of the
> signal is lower, from tens of muV to 1-2 muV.  Why? Is it correct? Should I
> missed anything?
>
> Thank you very much.
> Best regards,
>
> Paolo.
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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