[Eeglablist] All red or blue ICA

Luca Pion-Tonachini lpionton at ucsd.edu
Wed Apr 5 15:19:42 PDT 2017

Hi Julia,

I've seen the before as well and my personal theory is that they are due 
to common mode noise (though I don't have direct proof). If you change 
your data to using a common average reference, I think they should go 
away. That would also explain why your data looks cleaner without them, 
as you are essentially removing the common mode noise (albeit in an 
roundabout way).


On 04/05/2017 08:24 AM, Julia Basso wrote:
> Dear all,
> I have a 20 channel EEG system and after cleaning the data by first 
> conducting a band pass filter than cleaning epoched data by visual 
> inspection, I am running ICA to detect and remove eye blinks and eye 
> movements.
> My question is in regards to ICs that are distinctly all blue or all 
> red. My instinct is to remove these ICs (and when I do, the data looks 
> cleaner)- but I wanted to get your opinion.  What does this type of IC 
> indicate?  Is it merely noise in the system?
> Best,
> Julia
> -- 
> /Julia C. Basso, PhD, CYT/
> /Post-doctoral Research Associate/
> /
> /
> /New York University/
> /Center for Neural Science/
> /Suzuki Laboratory/
> /4 Washington Place, Room 809/
> /New York, NY  10003/
> /(212) 998-3969/
> www.juliabasso.com <http://www.juliabasso.com>
> /www.suzukilab.com <http://www.suzukilab.com>/
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